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Structural assessment of the tower of the University of Coimbra by

Júlio, Eduardo Nuno Brito Santos; Rebelo, Carlos Alberto da Silva; Dias-da-Costa, Daniel António Semblano Gouveia
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
45.94%
The University of Coimbra was founded in 1290. Erected between 1728 and 1733, the present Tower of the University is not only the symbol of the university, but the symbol of the city itself. A recent inspection of the tower, conducted to prepare restoration works, revealed some structural anomalies, including degradation of joints and cracking of stone blocks. In this paper we describe a study undertaken to assess rapidly the structural integrity of the tower, in order to minimize the delay of the previously planned non-structural intervention. A finite element model of the tower was built with ADINA software and calibrated with measured data obtained from ambient vibration, namely the mode shapes and the natural frequencies. Results point toward the probable non existence of structural problems. It was concluded that modal identification is a fast and reliable technique that can be used in-situ to establish the structural assessment of this type of construction.

Avaliação miofuncional orofacial na fissura labiopalatina: proposta de protocolo de exame; Myofunctional assessment in cleft lip and palate: proposal of examination protocol

Graziani, Andreia Fernandes
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 30/06/2014 PT
Relevância na Pesquisa
36.01%
Objetivo:A fissura labiopalatina acomete várias estruturas orofaciais e portanto, faz-se necessário a aplicação de um exame específico do sistema estomatognático. O objetivo deste estudo foi elaborar um protocolo de avaliação miofuncional orofacial para indivíduos com fissura labiopalatina e realizar a validação do conteúdo. Método: Após a aprovação do Comitê de Ética em Pesquisa, elaborou-se um protocolo de avaliação miofuncional orofacial, que contempla os aspectos estruturais e funcionais do sistema estomatognático. Esse protocolo foi revisado por dois fonoaudiólogos experientes na avaliação de pacientes com fissura la biopalatina e realizadas adequações necessárias. Em seguida, obteve-se imagens, necessárias à realização do exame miofuncional orofacial de 75 indivíduos com fissura labiopalatina, de ambos os sexos e diferentes fases da vida (infância, adolescência e adulta), que não apresentavam síndrome ou outras malformações associadas. As imagens foram armazenadas em um computador e transferidas para um dispositivo móvel para que três fonoaudiólogos experientes nesse tipo de avaliação as analisassem conforme o protocolo proposto. A concordância entre os fonoaudiólogos foi verificada pelo teste Kappa e a validação do conteúdo pela aplicação do Índice de Validação do Conteúdo. Resultados: O instrumento foi elaborado em 14 aspectos...

Possibilities and comparison of structural component models for the seismic assessment of modern unreinforced masonry buildings

Marques, Rui Filipe Pedreira; Lourenço, Paulo B.
Fonte: Elsevier Publicador: Elsevier
Tipo: Artigo de Revista Científica
Publicado em //2011 ENG
Relevância na Pesquisa
36.02%
This paper addresses the possibilities of structural component models for the seismic assessment of masonry buildings using pushover analysis. The ultimate goal is to allow efficient design of new unreinforced masonry buildings in seismic areas. Different modelling strategies are presented and the implementation of a simple design tool based on structural component models is described in detail. The different approaches are applied to a two-storey building with regular plan and elevation, allowing for a comparison between them. The results indicate that macro-modelling using structural component models and pushover analysis are adequate approaches for the seismic assessment and design of unreinforced masonry buildings, as the tools require very low computational resources, allow easy interpretation of results and provide satisfactory accuracy.

Assessment of the structural properties of timber members in situ : a probabilistic approach

Machado, J. S.; Lourenço, Paulo B.; Palma, Pedro
Fonte: LNEC Publicador: LNEC
Tipo: Conferência ou Objeto de Conferência
Publicado em //2011 ENG
Relevância na Pesquisa
36%
The assessment of the structural performance of existing timber structures is dependent, among other factors, on the capacity to evaluate the physical and mechanical properties of structural timber elements in situ. This paper discusses the possibilities/advantages of using a probabilistic approach to obtain a more reliable prediction of the reference properties of these timber members in situ. The presented approach combines information from common non-destructive techniques (NDT), such as visual assessment and ultrasounds, and those from semi-destructive tests (SDT), as meso tension specimens and wood cores. An application of this approach to maritime pine (Pinus pinaster Ait.) and chestnut (Castanea sativa Mill.) timber pieces of structural dimension is presented.

Assessment of the structural properties of timber members in situ : a probabilistic approach

Machado, J. S.; Lourenço, Paulo B.; Palma, Pedro
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Artigo de Revista Científica
Publicado em //2012 POR
Relevância na Pesquisa
36%
The assessment of the structural performance of existing timber structures is dependent, among other factors, on the capacity to evaluate the physical and mechanical properties of structural timber elements in situ. This paper discusses the possibilities/advantages of using a probabilistic approach to obtain a more reliable prediction of the reference properties of these timber members in situ. The presented approach combines information from common non-destructive techniques (NDT), such as visual assessment and ultrasounds, and those from semi-destructive tests (SDT), as meso tension specimens and wood cores. An application of this approach to maritime pine (Pinus pinaster Ait.) and chestnut (Castanea sativa Mill.) timber pieces of structural dimension is presented.; A avaliação da capacidade resistente de estruturas de madeira existentes encontra-se dependente de vários fatores, nomeadamente, a competência em avaliar in situ as propriedades físicas e mecânicas de elementos estruturais de madeira. O presente artigo pretende discutir as possibilidades/vantagens da aplicação de métodos probabilísticos, de forma a obter uma estimativa mais fiável das propriedades de referência destes elementos. O método proposto combina informação obtida por métodos não destrutivos correntes...

Non-destructive tests for the structural assessment of a historical bridge over the Tua River

Valente, Isabel; Ramos, Luís F.; Vazquez, Kevin; Guimarães, Paulo; Lourenço, Paulo B.
Fonte: Trans Tech Publications Publicador: Trans Tech Publications
Tipo: Conferência ou Objeto de Conferência
Publicado em 08/07/2013 ENG
Relevância na Pesquisa
46%
Publicado em : "Damage assessment of structures X", ISBN 978-3-03785-796-0. Serie "Key engineering materials", vol. 569-570; Paradela Bridge is a metallic bridge located along the bank of the Tua River in northern Portugal. While the bridge is not currently in service, its structure is representative of many metallic truss structures built across the continent between the XIX and the XX century.Tua Line belongs to the Douro area that UNESCO recently declared as world heritage. This study acquires its importance since it might serve as an insight for the study of many other similar structures all over the country. This paper comprises a historic investigation of archived documents, an on-site survey to evaluate its present conditions, a dynamic testing and the construction and calibration of numerical models in finite element analysis (FEA) software, structural assessment and capacity rating estimation. The purpose of constructing numerical models was to evaluate the suitability of the bridge under the original loading and in accordance to modern design standards. The historical research revealed that the truss bridge was designed as a simply supported elementand that a series of hand calculations were carried out on individual structural elements (e.g. main trusses...

Statistical assessment of damage to churches affected by the 2010-2011 Canterbury (New Zealand) earthquake sequence

Leite, João C.; Lourenço, Paulo B.; Ingham, Jason
Fonte: Taylor & Francis Publicador: Taylor & Francis
Tipo: Artigo de Revista Científica
Publicado em //2013 ENG
Relevância na Pesquisa
45.91%
The Canterbury Region of New Zealand experienced an extensive earthquake sequence during 2010-2011, with two particularly severe events being on 4 September 2010 and 22 February 2011. The presented work entails a statistical analysis of the data collected for 112 churches in the affected region, including in situ damage observed by the authors and the structural assessment classification assigned by local authorities. The seismic performance of these churches is discussed and compared with both the structural classifications used in Italy, where a specific survey form for churches is used, and with the building damage classifications assigned by the local authorities.

Structural assessment of the 16th century coastal watchtowers in the defense system of the Pontifical state

Cacciotti, Riccardo; Lourenço, Paulo B.
Fonte: International Masonry Society Publicador: International Masonry Society
Tipo: Artigo de Revista Científica
Publicado em //2014 ENG
Relevância na Pesquisa
45.81%
Since medieval times the Mediterranean area and in particular its coasts have witnessed a series of clashes for economic and cultural domination, partially concluded, with the Battle of Lepanto in 1571. The resulting state of uncertainty and endless terror among the population pushed military engineers to develop organized coastal defense systems consisting of a network of strongholds such as watchtowers, castles and fortresses whose structural and functional characteristics changed sensitively during the centuries. The result is a vast, heterogeneous and almost unexplored part of our built heritage. This paper focuses on the description of the coastal defensive system of the Pontifical State, concentrating on the geometrical, material and constructive characteristics of a particular structural typology: the 16th century watchtower. The aim is to establish an idealized model validated by historical information and in-situ surveys. A structural analysis is carried out, including a simple index analysis, linear dynamic and nonlinear static analyses. These analyses provide preliminary insights on the global mechanisms of failure and on the real behavior of the structure. Conclusions are drawn concerning the necessity of interventions in the perspective of an appropriate reuse of the towers which could endorse the restoration and maintenance bringing them to a new life.

Structural properties of adobe dwellings in Cusco (Peru) for seismic risk assessment

Tarque, N.; Crowley, H.; Varum, H.; Pinho, R.
Fonte: Universidade de Aveiro Publicador: Universidade de Aveiro
Tipo: Conferência ou Objeto de Conferência
ENG
Relevância na Pesquisa
36.04%
This paper looks at the structural properties of adobe buildings in Cusco, Peru, for use in seismic risk assessment. The geometrical properties (typology) of adobe dwellings from Cusco have been established according to a building-by-building survey. Cusco has been chosen for this study as, according to the national census, around 80% of the building stock in this town is constructed with adobe. Furthermore, this region of the country is relatively seismically active and thus seismic risk assessment studies are warranted. Additional structural information of adobe buildings has been obtained from experimental tests carried out at the Catholic University of Peru. These tests have allowed the inter-storey drift capacity and the period of vibration of adobe buildings to be derived. A database containing the principal geometrical properties of 30 dwellings has been created which has allowed the mean, standard deviation and probability density functions (PDF) to be defined for each parameter such as storey height, wall length, etc. These properties are of use in a recently proposed probabilistic displacement- based earthquake loss assessment method (DBELA) which generates random populations of buildings based on this input data. The structural capacity of each random building is then predicted based on structural mechanics principles...

Democratic Republic of São Tomé and Príncipe : Country Integrated Fiduciary Assessment, Volume 1. Executive Summary

World Bank
Fonte: Washington, DC Publicador: Washington, DC
EN_US
Relevância na Pesquisa
36.01%
This Integrated Fiduciary Assessment is the first of its kind for Sao Tome and Principe. It combines the analysis and policy recommendations from a public expenditure review (PER), a country financial accountability assessment (CFAA), and a country procurement assessment review (CPAR). The goal of the report is to identify the major challenges facing the country in the prepetroleum era (the next three to five years) in public finance management (including public enterprises) as it attempts to implement its National Poverty Reduction Strategy (NPRS) with a tight resource envelope. This executive summary presents recent economic developments and fiscal sustainability analysis that takes into account petroleum and no-petroleum scenarios, with corresponding analysis on which of the Millennium Development Goals (MDGs) are reachable. The summary reports on revenue and expenditure performance since 2000-01, issues related to the implementation of the public investment program (PIP) and its coordination with the NPRS, and the budget process...

Mechanical Characterization of Concrete at High Strain-rate by a Modified Hopkinson Bar: a Tool in Blast and Impact Structural Assessment and Design

CADONI Ezio; SOLOMOS GEORGE; ALBERTINI C.
Fonte: Centro Comum de Pesquisa da Comissão Européia Publicador: Centro Comum de Pesquisa da Comissão Européia
Tipo: Contributions to Conferences Formato: CD-ROM
ENG
Relevância na Pesquisa
45.81%
During their lifetime, concrete structures may be subjected to several accidental loads, such as impacts and blasts, which induce different high strain-rates in the material, typically from ~0.01/sec for earthquakes to ~100/sec for very strong explosions. Concrete is also used in protective structures. However, despite its many applications, the knowledge with regards to concrete behaviour at high strain rate is still incomplete mainly due to the difficulty in the realization of appropriate tests. For this reason large experimental campaigns on concrete subjected to dynamic loads have been conceived and developed in the last ten years. In the following some results are summarized obtained at the Joint Research Centre – Ispra, where several programs have been developed in order to produce new data on some basic subjects of industrial importance Among them are: the influence of the increasing aggregate size; the influence of the specimen size and the influence of the relative humidity and so on, both in tension and compression.; JRC.G.5-European laboratory for structural assessment

Experimental Contribution of the JRC ELSA laboratory for the Assessment and Control of Vibration of Structures and Cables

RENDA VITO; MAGONETTE GEORGES; MOLINA RUIZ FRANCISCO JAVIER; TIRELLI DANIEL; VIACCOZ BERNARD
Fonte: Department of Civil Engineeding, University of Southern California Publicador: Department of Civil Engineeding, University of Southern California
Tipo: Contributions to Conferences Formato: Printed
ENG
Relevância na Pesquisa
36.01%
The Joint Research Centre (JRC) of the European Commission (EC) is engaged since many years in research towards safety in structural mechanics mainly through the European Laboratory for Structural Assessment (ELSA, site of Ispra, Varese, Italy). The Laboratory contributes also to the assessment and the validation of innovation methodologies, technologies and systems for the control of vibration of structures and cables. ELSA gave a major contribution to two important European projects both partially funded by the EC General Directorate for Research. The first, titled “Active control in Civil Engineering (ACE)”, aiming at validating active systems for the control of vibrations of cable stayed bridges; the second, titled “Integrated Monitoring and Assessment of Cables (IMAC)”, aiming at better understanding of the vibration characteristics of the cables of bridges and validating of new diagnostic systems. In the framework of the project ACE, JRC contributed to the validation of the active control system performing a testing campaign on a large-scale mock-up of cables stayed bridge. The aim was to damp the cables and deck vibrations by using active hydraulic actuators in series with the two longest cables. The results showed that the system induces very high damping in the structure (until about 13%) and contributes to a very strong reduction of the bridge-deck vibration (from about 40 cm to 2-3 cm). In the framework of the project IMAC...

Earthquake performance assessment and rehabilitation of two historical unreinforced masonry buildings

HANCILAR UFUK; CAKTI Eser; ERDIK Mustafa
Fonte: SPRINGER Publicador: SPRINGER
Tipo: Articles in Journals Formato: Online
ENG
Relevância na Pesquisa
36.01%
The paper describes the earthquake performance assessment of two historical buildings located in Istanbul exposed to a Mw=7+ earthquake expected to hit the city and proposes solutions for their structural rehabilitation and/or strengthening. Both buildings are unreinforced clay brick masonry (URM) structures built in 1869 and 1885, respectively. The first building is a rectan-gular-shaped structure rising on four floors. The second one is L-shaped with one basement and three normal floors above ground. They survived the 1894, Ms=7.0 Istanbul Earthquake, during which widespread damage to URM buildings took place in the city. Earthquake ground motion to be used in performance assessment and retrofit design is determined through probabilistic and deterministic seismic hazard assessment. Strength characteristics of the brick walls are assessed on the basis of Schmidt hammer test results and information reported in the literature. Dynamic properties of the buildings (fundamental vibration periods) are measured via ambient vibration tests. The buildings are modelled and analyzed as three-dimensional assembly of finite elements. Following the preliminary assessment based on the equivalent earthquake loads method, the dynamic analysis procedure of FEMA 356 and ASCE 41-06 [2 and 8] is followed to obtain dynamic structural response of the buildings and to evaluate their earthquake performance. In order to improve earthquake resistance of the buildings...

Seismic performance assessment addressing sustainability and energy efficiency

ROMANO ELVIRA; NEGRO Paolo; TAUCER Fabio
Fonte: Publications Office of the European Union Publicador: Publications Office of the European Union
Tipo: EUR - Scientific and Technical Research Reports Formato: Online
ENG
Relevância na Pesquisa
36.02%
Sustainability has become one the most ambitious challenges for Europe growth, according to 2020 Europe Strategy. This high-priority theme braces a lot of industrial sectors. In particular the construction sector bears a huge responsibility in relation to sustainable development because of several impacts produced on its three dimensions: environment, economy and society. A building has to fulfill its own performance not only in the abovementioned common triple-bottom line of sustainability, but also in usability, capacity, reliability, safety and comfort. In that context, designing a sustainable construction turns out to be a very complex issue, so a holistic view is the key of sustainability in the construction sector. Furthermore, buildings should be designed and assessed in the light of time with a future in mind which can be predicted only in probabilistic terms, so an integral life-cycle approach is required. This report emphasizes the present need for the construction sector to develop a new way to conceive structures, with the aim to develop a competitive sustainable construction sector. In order to obtain this European objective a new design methodology is needed, focusing on a multi-performance, life-cycle oriented approach. A potential Sustainable Structural Design (SSD) methodology with its three main steps is presented...

An approach to include environmental assessment in structural design

DATTILO Caterina Antonia; LANDOLFO Raffaele; ROMANO ELVIRA; NEGRO Paolo
Fonte: University of Naples Federico II Publicador: University of Naples Federico II
Tipo: Contributions to Conferences Formato: Printed
ENG
Relevância na Pesquisa
36.04%
Nowadays the European attention on impacts produced by the construction sector leads to analyse new ways to conceive structures. Buildings should satisfy not only structural requirements but also the environmental, social and economic ones in accordance to the principles of Sustainable Development. In line with that a holistic balance among these requirements is needed to reach the goal of a sustainable construction. In particular, steel as a building material has undoubtful and inherent advantages in this respect, above all for its mature loop of recycling. The application of the Life Cycle Assessment (LCA) methodology has become a fundamental issue for the sustainable structural design. Indeed, LCA allows engineers and architects to assess the environmental sustainability throughout the whole life-cycle of a building, but it can also result into a tool to make decisions and to control costs. This paper proposes an approach to include environmental issues in structural design. In order to obtain a global assessment parameter to compare alternative design solutions, the need to consider structural and environmental analysis in economic terms is discussed. In particular, the environmental results in terms of CO2 emissions and energy consumptions have to be transformed into costs.; JRC.G.5-European laboratory for structural assessment

Structural assessment of pile supported piers

Keiter, Richard Jay.
Fonte: Monterey, California. Naval Postgraduate School Publicador: Monterey, California. Naval Postgraduate School
Tipo: Tese de Doutorado
EN_US
Relevância na Pesquisa
45.96%
CIVINS; With the mobile nature of the armed forces, marine facilities are being encountered overseas for which no design data is readily available. To be able to consider such a pier in tactical planning, an assessment must be performed to estimate the load capacity of the pier. There is a group of technicians in the U.S. Navy that can perform rapid inspections on marine structures and gather data on the physical condition of the structure as well as the local environment. This data, combined with knowledge of design principles for waterfront structures, is used to provide a rapid estimate of the load capacity of the pier. This study focuses on a strategy for providing a rapid structural assessment of a waterfront pier given the information gathered during the on-site inspection combined with principles of waterfront structure design. The author has developed a program using the C programming language that, given the limited information gathered by UCT personnel, can be used in the field to provide an estimate of the structural capacity of an open, timber, pile- supported pier. The program prompts the user for various physical, environmental, and condition data and outputs various data files. A text file is produced which contains the inspection record that reflects the users input and the assessment results for the pier being analyzed. A MATLAB(Registered) script file is produced which can be used for subsequent processing

Guidelines for on-site assessment of historic timber structures

Cruz, Helena; Yeomans, David; Tsakanika, Eleftheria; Macchioni, Nicola; Jorissen, Andre; Touza, Manuel; Mannucci, Massimo; Lourenço, Paulo B.
Fonte: Taylor & Francis Publicador: Taylor & Francis
Tipo: Artigo de Revista Científica
Publicado em //2014 ENG
Relevância na Pesquisa
36.03%
In the scope of COST IE0601-WoodCulther (http://www.woodculther.org) it was agreed to produce Guidelines for the Assessment of Historic Timber Structures, covering the principles and possible approaches for the safety assessment of old timber structures of historical relevance, that could be used as the basis for possible European Standards, as discussed with CEN/TC346 (Conservation of cultural heritage). This was targeted at all those concerned with the conservation of heritage buildings. It should also help decision-making regarding the need for immediate safety measures. Its aim is to guarantee that inspection and assessment measures provide the necessary data for historical analysis, structural safety assessment and planning of intervention works, while having minimal impact on the building fabric (the original materials, structural systems and techniques). This paper provides information on the criteria to be used in the assessment of load bearing timber structures in heritage buildings. It covers the preliminary assessment (desk survey, preliminary visual survey, measured survey, structural analysis and preliminary report), as well as the detailed survey of timbers (with a special emphasis on visual strength grading on site) and carpentry joints. The subsequent diagnostic report and the detailed design of repairs are outside its scope.

A holistic methodology for probabilistic safety assessment of timber elements combining onsite and laboratory data

Sousa, Hélder S.; Branco, Jorge M.; Lourenço, Paulo B.
Fonte: Taylor & Francis Publicador: Taylor & Francis
Tipo: Artigo de Revista Científica
Publicado em 11/04/2015 ENG
Relevância na Pesquisa
45.93%
The assessment of existing timber structures comprises several fields of knowledge, each one providing its own piece of information aiming at an effective answer. Even if general guidelines are available, there is still a need for a holistic approach that is able to combine information from different sources and infer upon that information allowing also, in that process, for an updating scheme aiming at a more substantiated decision process. In that scope, this work proposes a methodology for a holistic assessment of timber elements. The methodology combines information gathered in different scales and follows a probabilistic framework that allows for the structural assessment of existing timber elements with possibility of inference and updating of the mechanical properties of the elements, through Bayesian methods. The described methodology is based in four main steps: (i) scale of information; (ii) local and global data; (iii) probability assignment; and (iv) long term structural analysis. After the description of the methodology, its limitations and possible future modifications are discussed.

The case for ongoing student course assessment

Aghayere, Abi; Aghayere, Abi
Fonte: Rochester Instituto de Tecnologia Publicador: Rochester Instituto de Tecnologia
Tipo: Conferência ou Objeto de Conferência Formato: 137193 bytes; 25881 bytes; 1931 bytes; 676 bytes; 7743 bytes; 49 bytes; 137193 bytes; application/pdf; text/plain; text/plain; application/octet-stream; application/octet-stream; application/octet-stream; application/pdf
EN_US
Relevância na Pesquisa
36.05%
Most colleges in the United States use end-of-term course assessment as the main feedback mechanism from students. By using this method of summative assessment, students are able to rate the course, the performance of the instructor, and what they have learned in the course, among other things. One drawback of the end-of-term feedback is that the current students are not able to benefit from any improvements in the course that may result from their feedback. To overcome this drawback, the author explores in this paper the use of ongoing assessment of student understanding of course topics throughout the quarter using module surveys. In this paper, the author presents the advantages of the ongoing assessment technique, the survey data from online and on-campus sections of the author?s structural analysis course, and feedback from students regarding the effectiveness of the module surveys. This continuous improvement process has been successfully adopted in the author?s structural analysis, structural steel design and reinforced concrete design courses. The analysis of the data obtained from administering this survey to students in the structural analysis course is presented. Based on the survey data and the students? feedback, it can be concluded that ongoing formative assessment methods enhance student learning and should be adopted in Engineering Technology (ET) courses as one way of satisfying the ?closed loop? continuous improvement process now required by the accrediting agencies.; Presentation at the ASEE Annual Conference in Portland...

A Sustainable Structural Design method to analyze structural and environmental performances of a building

TSIMPLOKOUKOU KASSIANI; NEGRO Paolo
Fonte: International Association for Bridge and Structural Engineering (IABSE) Publicador: International Association for Bridge and Structural Engineering (IABSE)
Tipo: Articles in periodicals and books Formato: Online
ENG
Relevância na Pesquisa
46.02%
Current environmental assessment methods evaluate buildings over their life-cycle at a later design stage to provide an indication of their environmental performance. At that stage the environmental information cannot be effectively used in the general design process, whereas the sole aspect of the environmental performance cannot provide comparable building solutions. The Sustainable Structural Design (SSD) method, here introduced, considers environmental and structural parameters with a life-cycle approach. The integration of environmental data in the structural performance is the focus of this method, structural performances are considered as a probabilistic variable, through the introduction of a simplified Performance-Based Assessment method. The SSD method is implemented in a case study of a commercial building both for cast-in-situ and precast structure solutions.; JRC.G.4-European laboratory for structural assessment