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Contribution to assessing the stiffness reduction of structural elements in the global stability analysis of precast concrete multi-storey buildings; Contribuição para a avaliação da redução da rigidez de elementos estruturais de concreto pré-moldado de edifícios de múltiplos pavimentos para análise da estabilidade global

Marin, M. C.; El Debs, Mounir Khalil
Fonte: IBRACON - Instituto Brasileiro do Concreto Publicador: IBRACON - Instituto Brasileiro do Concreto
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.31%
This study deals with the reduction of the stiffness in precast concrete structural elements of multi-storey buildings to analyze global stability. Having reviewed the technical literature, this paper present indications of stiffness reduction in different codes, standards, and recommendations and compare these to the values found in the present study. The structural model analyzed in this study was constructed with finite elements using ANSYS® software. Physical Non-Linearity (PNL) was considered in relation to the diagrams M x N x 1/r, and Geometric Non-Linearity (GNL) was calculated following the Newton-Raphson method. Using a typical precast concrete structure with multiple floors and a semi-rigid beam-to-column connection, expressions for a stiffness reduction coefficient are presented. The main conclusions of the study are as follows: the reduction coefficients obtained from the diagram M x N x 1/r differ from standards that use a simplified consideration of PNL; the stiffness reduction coefficient for columns in the arrangements analyzed were approximately 0.5 to 0.6; and the variation of values found for stiffness reduction coefficient in concrete beams, which were subjected to the effects of creep with linear coefficients from 0 to 3...

Contribuição ao projeto de estruturas multi-piso reticuladas em concreto pré-moldado; Contribution to the design of precast concrete multi-storey structures

Mota, Joaquim Eduardo
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 21/10/2009 PT
Relevância na Pesquisa
76.49%
Estruturas em concreto pré-moldado vêm sendo utilizadas com freqüência em sistemas reticulados do tipo multi-piso, destinados às mais variadas atividades como: estabelecimentos comerciais, estacionamentos, escolas, hospitais e etc. A utilização de ligações viga-pilar do tipo semi-rígida constitui uma alternativa interessante para o enrijecimento e para a garantia da estabilidade global deste tipo de estrutura. Atualmente, a rigidez e a resistência destas ligações têm sido determinadas por ensaios de modelos em escala real. Estes ensaios, além de apresentarem um custo elevado, têm aplicação restrita à ligação examinada o que torna esta metodologia limitada e não adequada à prática de elaboração de projeto. Apresenta-se, neste trabalho, um modelo mecânico para determinação numérica da relação força-deslocamento de uma ligação viga-pilar semi-rígida a partir da contribuição da rigidez individual de cada componente de transferência de força utilizado na vinculação. A formulação do equilíbrio do modelo é implementada em planilha eletrônica constituindo-se numa ferramenta de cálculo para o projetista, permitindo o estudo, de forma rápida e amigável, da influência do posicionamento e da rigidez individual de cada componente de transferência de força na rigidez e na resistência da ligação. Este modelo mecânico foi utilizado para o cálculo da rigidez à rotação para momento fletor positivo de uma ligação viga-pilar ensaiada em laboratório. Os valores para a rigidez da ligação obtidos em ensaio e pelo modelo mecânico ficaram muito próximos. Da formulação do equilíbrio do modelo mecânico pode-se extrair ainda uma matriz de rigidez que é utilizada na representação da ligação semi-rígida no modelo de barra da estrutura. Um programa computacional foi desenvolvido para a análise de pórticos planos com ligação viga-pilar semi-rígida considerando ainda as não linearidades físicas e geométricas do modelo de cálculo. O programa foi validado pela comparação de resultados de exemplos também processados no programa ANSYS. A não-linearidade geométrica é considerada pelo método modal...

Contribuição ao estudo da estabilidade de edifícios de andares múltiplos em aço; Contribution to the study of stability of steel multi-storey buildings

Camargo, Rafael Eclache Moreira de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 20/08/2012 PT
Relevância na Pesquisa
56.23%
Este trabalho apresenta uma análise comparativa de diferentes sistemas estruturais para um edifício de 20 pavimentos. Cada um dos modelos foi dimensionado através dos princípios do método da análise direta, presente na ABNT NBR 8800:2008. O método da amplificação dos esforços solicitantes (MAES) foi usado para se obter de forma simplificada os esforços atuantes nos elementos do edifício considerando os efeitos locais e globais de segunda ordem. A incidência do vento foi simulada de duas formas diferentes. Na primeira, chamada de uniforme, o vento foi aplicado sem excentricidade, gerando apenas o efeito de tombamento nas estruturas. Na segunda hipótese, considerou-se uma excentricidade devida aos efeitos de vizinhança, prescrita pela ABNT NBR 6123:1988, responsável por ocasionar o tombamento e a torção dos edifícios. Todas as análises numéricas foram repetidas fazendo o uso de outro método simplificado de segunda ordem, conhecido como P-Delta. Por meio dos resultados obtidos, constatou-se que a possibilidade de se reduzir a sobrecarga para o dimensionamento de pilares proporciona uma economia de material, mas, por outro lado, tem como consequência o aumento do tempo de análise, pois exige a utilização de diferentes combinações de cálculo para o dimensionamento de vigas e pilares. A estratégia utilizada para simular os efeitos de vizinhança mostrou-se satisfatória...

Case study : comparison between the acoustic performance of a mixed building technology building and a conventional building

Bragança, L.; Patrício, Jorge
Fonte: Multi-Science Publishing Co Lda Publicador: Multi-Science Publishing Co Lda
Tipo: Artigo de Revista Científica
Publicado em //2004 ENG
Relevância na Pesquisa
36.23%
The objective of this work is to compare the acoustical performance of MBT (Mixed Building Technology) constructions and conventional buildings. The sound insulation performance of a MBT construction was assessed by tests done in situ. The results were compared with similar data from earlier measurements undertaken by the Building Physics Laboratory of the University of Minho in Portugal, and from simplified prediction methods. The building where this comparison was done is a 3-storey building. The first 2 storeys were refurbished using conventional construction methods, but the 3rd storey was built using MBT methods, characterised by using lightweight materials, with high thermal insulation, and large fenestration areas. Based on the work undertaken, some conclusions and proposals for further work are presented.

Seismic analysis of a 2-storey log house

Branco, Jorge M.; Lourenço, Paulo B.; Aranha, C.
Fonte: Trans Tech Publications Publicador: Trans Tech Publications
Tipo: Artigo de Revista Científica
Publicado em //2013 ENG
Relevância na Pesquisa
36.25%
The current paper deals with the analysis of the results yielded by a series of tests performed to evaluate the seismic behaviour of a model log construction. The study was based on an experimental investigation performed to improve the existing knowledge on log houses subject to seismic events. The main part of the experimental work is based on a full scale shaking table test, conducted on a two-storey log house designed by the Portuguese company Rusticasa® in compliance with design rules for timber buildings. The test was performed by the University of Minho within the framework of the SERIES Project ‘Multi-storey timber buildings’ and was coordinated by the University of Trento, at LNEC, Lisbon, Portugal. The geometry of the specimen, the design of the test, the setup and the instrumentation layout are first presented in this paper. The test procedure was conducted in stages with maximum accelerations (bi-directional) of 0.07g, 0.28g and 0.5g. The experimental results of each test have been analyzed and the resultant values of inter-storey drift, wall slippage and uplift measurements, shear deformations and hold-down forces measured are presented. Most importantly, the dynamic properties (fundamental period and mode shapes) of the system have been determined.

Low cost construction : state of the art and prospects for using structure wood apartment buildings in Portugal

Oliveira, Marcos Guimarães de; Couto, J. Pedro; Mendonça, Paulo; Branco, Jorge M.; Silva, Mónica; Reis, António Pedro
Fonte: Taylor & Francis Group Publicador: Taylor & Francis Group
Tipo: Conferência ou Objeto de Conferência
Publicado em 30/10/2013 ENG
Relevância na Pesquisa
46.13%
The Low cost concept in buildings is normally associated with the construction of social housing. Today, with the economic crisis, this concept becomes increasingly important to all areas and in the different social hierarchies. Low cost architecture emerges as the demand to find economical constructive solutions, but still allowing good visual, hygrothermal and acoustic performances. Wood emerges as an excellent material able to achieve all these objectives. The ease decomposition and re-composition of prefabrication wood systems allow the flexibility of the building components, being capable of generating multiple combinatorial possibilities, customized and capable of responding to the users’ changing requests. This work aims to make a description of the evolution of the low cost concept within the industry of building construction, to provide a description of the state of the art and characterization of the potential of wood structures in multi-storey buildings, and place this type of structural solution in the “purposes” or objectives of the low cost construction.

A project contribution to the development of sustainable multi-storey timber buildings

Silva, Catarina V.; Branco, Jorge M.; Lourenço, Paulo B.
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Conferência ou Objeto de Conferência
Publicado em //2013 ENG
Relevância na Pesquisa
36.2%
Wood is a natural material, renewable, easily recyclable, and able to store carbon-dioxide, which makes tall timber buildings a solution with potential to answer the main sustainability targets. Cross laminated timber (CLT) has been pointed out as the best wood-based material to make this ambition a real thing. In order to understand why, this paper introduces the material and describe some demonstration buildings recently built. Based on diagnosed weaknesses of CLT buildings, it is presented an initial propose for a new CLT/glulam hybrid construction system, called Urban Timber (UT) system, which aims be able to support taller timber buildings. The main motivation was the development of a wood-based structural solution that provides more spatial flexibility and wider versatility for visual architectural expressions. The system is described and illustrated, considering concerns related with structural behavior, architectural value, structural connections and wood shrinkage.; Fundação para a Ciência e a Tecnologia (FCT)

Design procedures of reinforced concrete framed buildings in Nepal and its impact on seismic safety

Chaulagain, Hemchandra; Rodrigues, Hugo; Spacone, Enrico; Varum, Humberto
Fonte: Multi-Science Publishing Publicador: Multi-Science Publishing
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
46.38%
The present paper analyses the design procedure and its impact on seismic safety of the structures. For this, a representative reinforced concrete frame building (WDS) is designed and the results are compared with similar buildings detailed with: i) Current Construction Practices (CCP); ii) the Nepal Building Code (NBC) and iii) the Modified Nepal Building Code (NBC+) recommendations. The seismic performance evaluation is done with global strength, inter-storey drift and displacement of the structures. Likewise, the sensitivity of the structural and geometrical parameters of the RC frame building is studied through nonlinear analysis. The study parameters considered for parametric analysis are column size, beam size, inter-storey height, bay length, bay width, and compressive strength of concrete. The results show that the influence on the structural behaviour, particularly by variation in column size and inter-storey height. Additionally, the influence of the seismic zone factor on reinforcement demand of the structure is studied. The result shows that structures designed for high to medium seismic hazard demands double the reinforcement in beams compared to structures in low seismic zone.

On the Typology, Costs, Energy Performance, Environmental Quality and Operational Characteristics of Double Skin Façades in European Buildings

Streicher, Wolfgang; Heimrath, Richard; Hengsberger, Herwig; Mach, Thomas; Waldnere, Reinhard; Flamantf, Gilles; Loncourg, Xavier; Guarracinoh, Gérard; Erhorni, Hans; Erhorn-Kluttigj, Heike; Santamourisk, Matheos; Faroul, Ifigenia; Zerefosm, S.; Assimako
Fonte: Taylor & Francis Publicador: Taylor & Francis
Tipo: Pré-impressão
Publicado em //2007 ENG
Relevância na Pesquisa
36.21%
The project BESTFAÇADE, sponsored by the Energy Intelligent Europe programme of the European Union, and led by MCE-Anlagenbau, Austria, accumulated the state of the art of double skin façades (DSFs) in seven European countries (Austria, Belgium, France, Germany, Greece, Portugal and Sweden). Twenty-eight façades of different buildings in all partner countries of BESTFAÇADE have been analysed for the aspects, types of façade in different countries, DSFs in different climatic regions of Europe, existing simulations and measurements, thermal behaviour, indoor air quality, comfort, user acceptance, energy demand and consumptions, control strategies, integrated building technology, cost (investment, maintenance and operation), resource conservation, environmental impact, comparison to conventional glass façades (CGFs), integration of renewable energy sources into DSFs, as well as non-energy related issues, such as, acoustics, aesthetics, fire protection, moisture, corrosion, durability, maintenance and repair. Most of the buildings are office buildings, followed by schools and service buildings. Nearly all of the buildings have mechanical ventilation systems, and both heating and cooling are performed mostly by air heating/cooling systems. The types of façades are mainly multi-storey and corridor types; in Belgium juxtaposed modules are frequently used. The façade gaps are mostly naturally ventilated (except for Belgium...

Non-linear FEM analysis of seismic induced pounding between neighbouring multi-storey structures

Jameel,Mohammed; Islam,A.B.M. Saiful; Hussain,Raja Rizwan; Hasan,Syed Danish; Khaleel,M.
Fonte: Associação Brasileira de Ciências Mecânicas Publicador: Associação Brasileira de Ciências Mecânicas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2013 EN
Relevância na Pesquisa
36.2%
Pounding of neighbouring construction of structures due to seismic excitation increases the damage of structural components or even causes collapse of structures. Among the possible building damages, earthquake induced pounding has been commonly observed in several earthquakes. Therefore it is imperative to consider pounding effect for structures. This study aims to understand the response behaviour of adjacent buildings with dissimilar heights under earthquake induced pounding. Effects of different separation distances between structures are also investigated. Nonlinear finite element analysis in time domain has been carried out for pounding of neighbouring structures having varying heights. To show the importance of avoiding pounding in structures the results obtained were compared with model having no pounding phenomena. The results were obtained in the form of storey shear, pounding force, storey drift, point displacement and acceleration. The acceleration at pounding level significantly increases during collision of building. The generated extra pounding force may cause severe damage to structural members of structures. Pounding produces shear at various story levels, which are greater than those obtained from no pounding case. Building with more height suffers greater damage than shorter building when pounding occurs. Increasing gap distance tends to reduce story shear in consistent manner. The results also show that the conventional modelling of building considering only beams and columns underestimates pounding effects. More realistic modelling such as beams...

Contribution to assessing the stiffness reduction of structural elements in the global stability analysis of precast concrete multi-storey buildings

Marin,M. C.; El Debs,M. K.
Fonte: IBRACON - Instituto Brasileiro do Concreto Publicador: IBRACON - Instituto Brasileiro do Concreto
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/06/2012 EN
Relevância na Pesquisa
66.31%
This study deals with the reduction of the stiffness in precast concrete structural elements of multi-storey buildings to analyze global stability. Having reviewed the technical literature, this paper present indications of stiffness reduction in different codes, standards, and recommendations and compare these to the values found in the present study. The structural model analyzed in this study was constructed with finite elements using ANSYS® software. Physical Non-Linearity (PNL) was considered in relation to the diagrams M x N x 1/r, and Geometric Non-Linearity (GNL) was calculated following the Newton-Raphson method. Using a typical precast concrete structure with multiple floors and a semi-rigid beam-to-column connection, expressions for a stiffness reduction coefficient are presented. The main conclusions of the study are as follows: the reduction coefficients obtained from the diagram M x N x 1/r differ from standards that use a simplified consideration of PNL; the stiffness reduction coefficient for columns in the arrangements analyzed were approximately 0.5 to 0.6; and the variation of values found for stiffness reduction coefficient in concrete beams, which were subjected to the effects of creep with linear coefficients from 0 to 3...

3D-Building Height Extraction from Stereo IKONOS Data - Quantitative and Qualitative Validation of Digital Surface Models - Derivation of Building Height and Building Outlines

ECKERT SANDRA
Fonte: OPOCE Publicador: OPOCE
Tipo: EUR - Scientific and Technical Research Reports Formato: Printed
ENG
Relevância na Pesquisa
36.24%
This report is dealing with the digital surface model generation from VHR stereo satellite data with the focus on building height and shape extraction. The report provides a theoretical insight into orthorectification methods based on either empirical or rigorous, physical models and the theoretical aspects of digital surface model extraction. The requirement and ideal distribution of ground control points is discussed. In the final part of the report the results of four software packages, ENVI, PCI Geomatica, RSG and Leica Photogrammetric Suite, tested for urban DSM generation, are presented and described. The orthorectification accuracy analyses were done using QuickBird and IKONOS data. The geometrical accuracies of the tested GCP based orthorectification methods have shown that a rigorous physical model gives the best horizontal accuracies and has proven to be stable, whereas RF based models tend to be instable. For the digital surface model accuracy analyses stereo IKONOS data were mainly used. Two datasets were used to perform the tests. One study area is situated in Nairobi where a variety of building types are present, from high-rise buildings to small illegal shacks. The second study area is in Graz, which was mainly chosen because a very detailed reference surface model was available. The five evaluation tests for the Nairobi test area have shown that all tested software packages created DSMs that performed well in at least one of the tests. They all have advantages and disadvantages. Height accuracy as well as clear building shape extraction is of great importance for the use of DSMs in information extraction for settlement analysis and mapping. The highlighted tests are representing these criteria best. Judging them it can be concluded that overall the PCI and RSG software performed best. They should be favoured for DSM extraction. The quantitative accuracy assessment for the test area of Graz has shown that the best vertical estimation results were achieved with the software packages of LPS and PCI followed by RSG. The vertical MAE for built-up and impervious areas was 2.20m for PCI...

Pseudo-Dynamic Tests on a Full-Scale Four-Storey Reinforced Concrete Frame Seismically Retrofitted with Reinforced Concrete Infilling

CHRYSOSTOMOU Christis Z.; POLJANSEK Martin; KYRIAKIDES Nicholas; TAUCER Fabio; MOLINA RUIZ Francisco Javier
Fonte: IABSE Publicador: IABSE
Tipo: Articles in Journals Formato: Online
ENG
Relevância na Pesquisa
36.28%
The effectiveness of seismic retrofitting of multi-storey multi-bay RC-frame buildings by converting selected bays into new walls through infilling with reinforced concrete (RC) was studied experimentally at the ELSA facility of the Joint Research Centre in Ispra (Italy). A fullscale model was tested with the pseudo-dynamic method and consisted of two four-storey (12m tall) three-bay (8.5m long) parallel frames linked through 0.15m slabs with the central bay (2.5m) infilled with a RC wall. The frames were designed and detailed for gravity loads only and are typical of similar frames built in Cyprus in the 1970’s. Different connection details and reinforcement percentages for the two infilled frames were used in order to study their effects in determining structural response. The results of the pseudo-dynamic and cyclic tests performed on the specimen and their analytical simulation are presented, and conclusions are drawn; JRC.G.4-European laboratory for structural assessment

La aportación estructural del Crystal Palace de la Exposición Universal de Londres 1851. Una ampliación del enfoque histórico tradicional.

López César, Isaac
Fonte: Redfundamentos Publicador: Redfundamentos
Tipo: Artigo de Revista Científica
SPA
Relevância na Pesquisa
36.44%
[Resumen] El objetivo del presente artículo es el de establecer la línea histórica que conduce desde la aplicación arquitectónica de los primeros elementos estructurales de hierro industrializado en edificios de varias plantas y cubiertas hasta la aplicación primigenia del pórtico rígido autoportante en un edificio de varias plantas. En este recorrido, el Crystal Palace de la Exposición Universal de Londres 1851 se revela como un elemento clave que articula la transición desde la tipología de entramado metálico estabilizado por muros perimetrales de fábrica hasta la moderna formalización del pórtico rígido autoestable aplicado al edificio en altura. Asimismo, se detectan las conexiones históricas existentes en dicho proceso, poniendo en valor edificios que han permanecido al margen de la historiografía arquitectónica convencional. Ampliamos, por tanto, el foco histórico centrado tradicionalmente en los logros de la Escuela de Chicago destacando y conectando históricamente los acontecimientos anteriores.; [Abstract] The aim of this paper is to establish a historical line from the first architectural application of structural elements made of industrial iron for roofs and multi-storey buildings to the first application of portal frame in a multi-storey building. With this in mind...

Seismic assessment of out-of-plane loaded unreinforced masonry walls in multi-storey buildings

Derakhshan, H.; Dizhur, D.Y.; Griffith, M.C.; Ingham, J.M.
Fonte: New Zealand Society for Earthquake Engineering Publicador: New Zealand Society for Earthquake Engineering
Tipo: Artigo de Revista Científica
Publicado em //2014 EN
Relevância na Pesquisa
56.37%
A procedure is proposed to evaluate the dynamic out-of-plane stability of cracked unreinforced masonry (URM) walls located in multi-storey URM buildings. The equations of dynamic motion are derived from first principles and representative single-degree-of-freedom (SDOF) models are proposed. The models have nonlinear stiffness properties that correspond to the restoring gravitational forces. A method is suggested to transform the nonlinear problem to a corresponding linear equivalent so that conventional spectral methods can be used to calculate wall response. The dynamic interaction between the URM building as the main structural system and the out-of-plane loaded walls as secondary elements is addressed by developing floor response spectra. Several buildings were assumed in a parametric study and subjected to code-compatible ground motion records. The absolute acceleration response at floor levels was calculated and the response spectra for that modified acceleration were subsequently obtained. The results from the study suggest that modifications should be made to the equations proposed for the Parts response spectra in the New Zealand seismic loading standard, NZS 1170.5:2004, in order to calculate the spectral response of out-of-plane loaded URM walls. Several worked examples are presented to demonstrate application of the procedure.; Hossein Derakhshan...

Ventilação natural em edifícios multifamiliares do "Programa Minha Casa Minha Vida"; Evaluating natural ventilation in multi-storey social interest housing

Juliana Magna da Silva Costa Morais
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 06/12/2013 PT
Relevância na Pesquisa
36.17%
A ventilação natural é uma estratégia projetual que deve ser usada sempre que possível em países de clima quente como o Brasil, pois dentre suas vantagens está o conforto térmico e a economia de energia. O uso desta estratégia deve ser priorizado principalmente em projetos destinados à população de baixa renda como é o caso dos edifícios incluídos no "Programa Minha Casa Minha Vida"- PMCMV. O objetivo desta tese é discutir e ventilação natural no interior de edifícios multifamiliares do PMCMV em três tipologias arquitetônicas diferentes localizadas na cidade de Campinas/SP, no intuito de alertar os projetistas em geral de como pequenas decisões de projeto podem influenciar no conforto térmico dos usuários. Adotou-se o uso de simulação computacional da ventilação natural por meio de CFD (Computer Fluid Dynamics) como ferramenta capaz de realizar esta análise. Assim, primeiro realizou-se a seleção dos edifícios que serviram de estudo de caso e a consequente modelagem 3D destes, considerando suas aberturas. Posteriormente realizou-se caracterização climática dos ventos da cidade de Campinas/SP, para obtenção dos dados de entrada no CFD. Por fim, realizou-se a simulação computacional da ventilação natural nas três tipologias escolhidas como estudos de caso para três diferentes ângulos de incidência do vento (0º...

Factors influencing the retrofitting of existing office buildings using Adelaide, South Australia as a case study

Bruce, T.; Zuo, J.; Rameezdeen, R.; Pullen, S.
Fonte: Emerald Group Publishing Publicador: Emerald Group Publishing
Tipo: Artigo de Revista Científica
Publicado em //2015 EN
Relevância na Pesquisa
66.6%
Purpose – The purpose of this paper is to explore the barriers preventing investment in the re-use of low-grade multi-storey building stock in order to identify attributes that determine whether an existing building is suitable for retrofitting. Design/methodology/approach – Semi-structured interviews were undertaken with key industry practitioners to investigate existing practices and barriers facing low-grade building retrofits and what “ideal” multi-storey building features represent a successful investment opportunity. Findings – The findings showed that tenant commitment is necessary before any project goes ahead and that there exist many barriers influencing the investment decision. These include: high levels of asbestos found in existing buildings; changes in the National Construction Code necessitating enhanced fire safety and disability access; heritage listing; lack of awareness; overestimation of costs involved on simple and effective energy efficiency upgrades and change in tenant demands towards modern and efficient open plan offices. Many low-grade structures are privately owned inherited assets where the owners lack the expertise and capital to undertake retrofitting effectively. Research limitations/implications – The study is focused on the Adelaide CBD in South Australia but the findings are relevant to other Australian cities. Practical implications – There is room in the market for more positive and influential schemes such as the Green Building Fund that encourage more energy efficiency upgrading of these buildings. Social implications – The greater occurrence of retrofitting and re-use of older buildings...

SISTEMAS DE VEDAÇÃO EM ALVENARIA PARA EDIFÍCIOS DE ESTRUTURA METÁLICA: DETALHAMENTO COM BASE NA PREVENÇÃO DE MANIFESTAÇÕES PATOLÓGICAS; Masonry Wall Systems for Steel Buildigs: Detailing Based in Pathological Problems Prevention

Araujo, André; Paes, José Luiz Rangel; Veríssimo, Gustavo de Souza
Fonte: Universidade de São Paulo. Instituto de Arquitetura e Urbanismo Publicador: Universidade de São Paulo. Instituto de Arquitetura e Urbanismo
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Avaliado Por Pares; ; Formato: application/pdf
Publicado em 31/12/2013 POR
Relevância na Pesquisa
36.17%
O desempenho de edifícios quanto à durabilidade está relacionado com a característica dos projetos em prever sistemas, com vistas à condição de exposição ambiental para a qual estarão submetidos. O presente artigo apresenta uma proposta para o projeto de sistemas de vedação em alvenaria para edifícios de estrutura metálica, com o intuito de proporcionar um bom desempenho quanto à durabilidade da estrutura e da vedação. Como subsídio, avaliou-se o desempenho das alvenarias de três edifícios institucionais, recentemente construídos, por meio da vistoria técnica de suas manifestações patológicas. Selecionaram-se edifícios com variações no tipo de vedação, no tipo de ligações alvenariaestrutura e no tratamento dado às fachadas. Avaliaram-se as informações produzidas em projeto e a eficácia dos detalhes. A partir dessas informações, qualificaram-se as práticas adotadas e identificaram-se, dentro de uma sequência de procedimentos, ações preventivas ao surgimento das manifestações patológicas. Por fim, são apresentdos os resultados da utilização dessas ações como norteadoras em um exercício de projeto.; The durability performance of multi storey buildings of steel structure is closely associated to the executive project planning in order to provide systems which areexposed to external conditions. The aim of this research was to present a methodological proposal for the design of masonry veneer systems for steel structure of institutional buildings which present high performance regarding durability. In order to execute this proposal...

Perceived obstacles to multi-storey timber-frame construction: an Australian study

Xia, B.; O'Neill, T.; Zuo, J.; Skitmore, M.; Chen, Q.
Fonte: Taylor & Francis Publicador: Taylor & Francis
Tipo: Artigo de Revista Científica
Publicado em //2014 EN
Relevância na Pesquisa
76.63%
The contemporary default materials for multi-storey buildings – namely concrete and steel – are all significant generators of carbon and the use of timber products provides a technically, economically and environmentally viable alternative. In particular, timber's sustainability can drive increased use and subsequent evolution of the Blue economy as a new economic model. National research to date, however, indicates a resistance to the uptake of timber technologies in Australia. To investigate this further, a preliminary study involving a convenience sample of 15 experts was conducted to identify the main barriers involved in the use of timber frames in multi-storey buildings. A closed-ended questionnaire survey involving 74 experienced construction industry participants was then undertaken to rate the relative importance of the barriers. The survey confirmed the most significant barriers to be a perceived increase in maintenance costs and fire risk, together with a limited awareness of the emerging timber technologies available. It is expected that the results will benefit government and the timber industry, contributing to environmental improvement by developing strategies to increase the use of timber technologies in multi-storey buildings by countering perceived barriers in the Australian context.; Bo Xia...

Análise de sistema de contraventamento híbrido aço/concreto para edifícios de múltiplos andares; Análise de sistema de contraventamento híbrido aço/concreto para edifícios de múltiplos andares

Alexandre Luiz Vasconcellos
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 10/08/2015 PT
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Sistemas mistos e híbridos aço/concreto tem sido objeto de diversos estudos pela comunidade científica. Estruturas de aço e de concreto armado tem vantagens que podem ser maximizadas e desvantagens que podem ser minimizadas por meio da associação de ambos, não apenas em termos estruturais, mas também nos aspectos construtivos, funcionais e estéticos. O resultado da eficácia dessa associação é um número crescente de edifícios de múltiplos andares com estruturas híbridas, principalmente no exterior, mas ainda não contemplado nas principais normas, inclusive internacionais. Com base em sistemas híbridos inovadores atualmente em desenvolvimento pela comunidade científica européia, este trabalho pretende apresentar o comportamento híbrido em painéis de contraventamento submetidos à ação do vento compostos por paredes de cisalhamento com lintéis de aço embutidos, simplesmente articulados a colunas mistas em ambos os lados da parede, aqui definido como Sistema Híbrido de Contraventamento. A estrutura metálica e mista é modelada em elementos de barras e as paredes são modeladas em elementos finitos. Discute-se, além do sistema construtivo cuja parede é erguida após a montagem da estrutura metálica sem ligações engastadas...