Estudo numérico e experimental de parâmetros de vibração em lajes de concreto
Autor(a) principal: | |
---|---|
Data de Publicação: | 2019 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) |
Texto Completo: | http://tede.upf.br:8080/jspui/handle/tede/1744 |
Resumo: | Investigating the dynamic characteristics of slabs has become very important since modern structures, due to the evolution of the mechanical strength of steel and concrete, have been built lighter with longer open spans, and consequently more susceptible to the phenomena of vibration. Therefore, knowing some parameters of vibration, such as natural frequencies and damping, in the design phase, can avoid vibrations problems in the future. This research aims to study the dynamic behavior of two types concrete slabs: waffle slabs and precast ribbed slabs. Initially, experimental tests were performed using the heel impact method using accelerometer and cell phone to obtain the fundamental frequencies and damping coefficients through two methods explained in the literature review. The acceleration responses are passed in a low-pass filter to evaluate the advantages of using filters in obtaining frequencies and damping. In addition, the modal parameters of natural frequency and vibration modes are computed using analytical formulas and computer modeling by finite element software. Experimental results show that the use of cell phones is a simple and economical alternative to obtain frequency and damping parameters in slabs. The damping factors can be predicted through the two methods presented, however the logarithmic decrement method is the best alternative when using non-instrumented tests, and the frequency filters were indispensable for the evaluation of the damping of the structures. Regarding the analytical results, analytical formulations for orthotropic plates have conservative values with good prediction to the natural frequencies, although the assumption of isotropic plates can be used for an initial estimation of this parameter. The computer modeling using shell elements to represent the slab geometry has shown approximate results to the experimental values, mainly for the waffle slabs. In general, it is possible to affirm that the fundamental frequencies two-way waffle slabs have substantial relation with the shorter span, and a simplified equation for estimating this parameter can be defined. |
id |
UPF-1_809008ab0204416d57a23147af00d9bb |
---|---|
oai_identifier_str |
oai:tede.upf.br:tede/1744 |
network_acronym_str |
UPF-1 |
network_name_str |
Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) |
repository_id_str |
|
spelling |
Chamberlain Pravia, Zacarias Martin01835414729http://lattes.cnpq.br/938554508191464407721844967http://lattes.cnpq.br/3808393903408307Lago, Fernanda Scussiato2019-07-10T17:19:27Z2019-02-28LAGO, Fernanda Scussiato. Estudo numérico e experimental de parâmetros de vibração em lajes de concreto. 2019. 164 f. Dissertação (Mestrado em Engenharia Civil e Ambiental) - Universidade de Passo Fundo, Passo Fundo, RS, 2019.http://tede.upf.br:8080/jspui/handle/tede/1744Investigating the dynamic characteristics of slabs has become very important since modern structures, due to the evolution of the mechanical strength of steel and concrete, have been built lighter with longer open spans, and consequently more susceptible to the phenomena of vibration. Therefore, knowing some parameters of vibration, such as natural frequencies and damping, in the design phase, can avoid vibrations problems in the future. This research aims to study the dynamic behavior of two types concrete slabs: waffle slabs and precast ribbed slabs. Initially, experimental tests were performed using the heel impact method using accelerometer and cell phone to obtain the fundamental frequencies and damping coefficients through two methods explained in the literature review. The acceleration responses are passed in a low-pass filter to evaluate the advantages of using filters in obtaining frequencies and damping. In addition, the modal parameters of natural frequency and vibration modes are computed using analytical formulas and computer modeling by finite element software. Experimental results show that the use of cell phones is a simple and economical alternative to obtain frequency and damping parameters in slabs. The damping factors can be predicted through the two methods presented, however the logarithmic decrement method is the best alternative when using non-instrumented tests, and the frequency filters were indispensable for the evaluation of the damping of the structures. Regarding the analytical results, analytical formulations for orthotropic plates have conservative values with good prediction to the natural frequencies, although the assumption of isotropic plates can be used for an initial estimation of this parameter. The computer modeling using shell elements to represent the slab geometry has shown approximate results to the experimental values, mainly for the waffle slabs. In general, it is possible to affirm that the fundamental frequencies two-way waffle slabs have substantial relation with the shorter span, and a simplified equation for estimating this parameter can be defined.Investigar as características dinâmicas em lajes de piso tem-se tornado muito importante uma vez que estruturas modernas, devido à evolução da resistência mecânica do aço e do concreto, têm sido construídas mais leves e com vãos livres maiores, e consequentemente mais suscetíveis ao fenômeno de vibração. Sendo assim, conhecer alguns parâmetros de vibração, como por exemplo frequências naturais e fatores amortecimentos, na fase de projeto, pode evitar problemas futuros de vibrações. Esta pesquisa visa a estudar o comportamento dinâmico de dois tipos de lajes: nervuradas e pré-moldadas com vigotas treliçadas. Inicialmente são realizados ensaios experimentais através do método de impacto de calcanhares com utilização de acelerômetro e dispositivo de celular para obtenção das frequências naturais para o primeiro modo normal e fatores de amortecimento por meio de dois métodos explicitados na revisão de literatura. As respostas em termos de aceleração são passadas em filtro de frequência para avaliação das vantagens da utilização de filtros na obtenção das frequências e amortecimentos. Também são levantados os parâmetros modais de frequência natural e modos de vibração por meio de fórmulas analíticas e pela modelagem numérico-computacional utilizando software de elementos finitos. Os resultados experimentais mostram que a utilização de celulares é uma alternativa simples e econômica para a obtenção dos parâmetros de frequência e amortecimento em lajes. Os fatores de amortecimento podem ser previstos através dos dois métodos apresentados, no entanto o método do decremento logarítmico é a melhor alternativa quando utilizam-se ensaios não instrumentados. Os filtros de frequência foram indispensáveis para a avaliação do amortecimento das estruturas. Quanto aos resultados analíticos, as formulações para placas ortotrópicas apresentam valores conservativos com boas aproximações para a obtenção das frequências naturais, embora a suposição de placas isotrópicas possa ser utilizada para uma estimativa inicial desse parâmetro. O modelo numérico-computacional que utiliza elementos de casca para a representação da geometria das lajes trouxe resultados aproximados aos valores experimentais, principalmente para as lajes nervuradas. De uma maneira geral, é possível afirmar que as frequências fundamentais para lajes nervuradas com comportamento bidirecional possuem grande relação com o vão livre menor, e uma equação simplificada para estimativa desse parâmetro pode ser definida.Submitted by Aline Rezende (alinerezende@upf.br) on 2019-07-10T17:19:27Z No. of bitstreams: 1 2019FernandaScussiatoLago.pdf: 5048206 bytes, checksum: 84ac620ea8c5275bd01851cc1511adcd (MD5)Made available in DSpace on 2019-07-10T17:19:27Z (GMT). No. of bitstreams: 1 2019FernandaScussiatoLago.pdf: 5048206 bytes, checksum: 84ac620ea8c5275bd01851cc1511adcd (MD5) Previous issue date: 2019-02-28application/pdfporUniversidade de Passo FundoPrograma de Pós-Graduação em Engenharia Civil e AmbientalUPFBrasilFaculdade de Engenharia e Arquitetura – FEARLajes de concretoMateriais de construçãoEngenharia civilVibraçãoENGENHARIAS::ENGENHARIA CIVILEstudo numérico e experimental de parâmetros de vibração em lajes de concretoNumerical and experimental study of vibration parameters in concrete slabsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-41729612957170071185005006008147033241558623806-6274833215046395772info:eu-repo/semantics/openAccessreponame:Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF)instname:Universidade de Passo Fundo (UPF)instacron:UPFORIGINAL2019FernandaScussiatoLago.pdf2019FernandaScussiatoLago.pdfapplication/pdf5048206http://tede.upf.br:8080/jspui/bitstream/tede/1744/2/2019FernandaScussiatoLago.pdf84ac620ea8c5275bd01851cc1511adcdMD52LICENSElicense.txtlicense.txttext/plain; charset=utf-82165http://tede.upf.br:8080/jspui/bitstream/tede/1744/1/license.txtbd3efa91386c1718a7f26a329fdcb468MD51tede/17442019-07-10 14:19:27.931oai:tede.upf.br: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Biblioteca Digital de Teses e DissertaçõesPUBhttp://tede.upf.br/oai/requestbiblio@upf.br || bio@upf.br || cas@upf.br || car@upf.br || lve@upf.br || sar@upf.br || sol@upf.br || upfmundi@upf.br || jucelei@upf.bropendoar:2019-07-10T17:19:27Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) - Universidade de Passo Fundo (UPF)false |
dc.title.por.fl_str_mv |
Estudo numérico e experimental de parâmetros de vibração em lajes de concreto |
dc.title.alternative.eng.fl_str_mv |
Numerical and experimental study of vibration parameters in concrete slabs |
title |
Estudo numérico e experimental de parâmetros de vibração em lajes de concreto |
spellingShingle |
Estudo numérico e experimental de parâmetros de vibração em lajes de concreto Lago, Fernanda Scussiato Lajes de concreto Materiais de construção Engenharia civil Vibração ENGENHARIAS::ENGENHARIA CIVIL |
title_short |
Estudo numérico e experimental de parâmetros de vibração em lajes de concreto |
title_full |
Estudo numérico e experimental de parâmetros de vibração em lajes de concreto |
title_fullStr |
Estudo numérico e experimental de parâmetros de vibração em lajes de concreto |
title_full_unstemmed |
Estudo numérico e experimental de parâmetros de vibração em lajes de concreto |
title_sort |
Estudo numérico e experimental de parâmetros de vibração em lajes de concreto |
author |
Lago, Fernanda Scussiato |
author_facet |
Lago, Fernanda Scussiato |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Chamberlain Pravia, Zacarias Martin |
dc.contributor.advisor1ID.fl_str_mv |
01835414729 |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/9385545081914644 |
dc.contributor.authorID.fl_str_mv |
07721844967 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/3808393903408307 |
dc.contributor.author.fl_str_mv |
Lago, Fernanda Scussiato |
contributor_str_mv |
Chamberlain Pravia, Zacarias Martin |
dc.subject.por.fl_str_mv |
Lajes de concreto Materiais de construção Engenharia civil Vibração |
topic |
Lajes de concreto Materiais de construção Engenharia civil Vibração ENGENHARIAS::ENGENHARIA CIVIL |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA CIVIL |
description |
Investigating the dynamic characteristics of slabs has become very important since modern structures, due to the evolution of the mechanical strength of steel and concrete, have been built lighter with longer open spans, and consequently more susceptible to the phenomena of vibration. Therefore, knowing some parameters of vibration, such as natural frequencies and damping, in the design phase, can avoid vibrations problems in the future. This research aims to study the dynamic behavior of two types concrete slabs: waffle slabs and precast ribbed slabs. Initially, experimental tests were performed using the heel impact method using accelerometer and cell phone to obtain the fundamental frequencies and damping coefficients through two methods explained in the literature review. The acceleration responses are passed in a low-pass filter to evaluate the advantages of using filters in obtaining frequencies and damping. In addition, the modal parameters of natural frequency and vibration modes are computed using analytical formulas and computer modeling by finite element software. Experimental results show that the use of cell phones is a simple and economical alternative to obtain frequency and damping parameters in slabs. The damping factors can be predicted through the two methods presented, however the logarithmic decrement method is the best alternative when using non-instrumented tests, and the frequency filters were indispensable for the evaluation of the damping of the structures. Regarding the analytical results, analytical formulations for orthotropic plates have conservative values with good prediction to the natural frequencies, although the assumption of isotropic plates can be used for an initial estimation of this parameter. The computer modeling using shell elements to represent the slab geometry has shown approximate results to the experimental values, mainly for the waffle slabs. In general, it is possible to affirm that the fundamental frequencies two-way waffle slabs have substantial relation with the shorter span, and a simplified equation for estimating this parameter can be defined. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-07-10T17:19:27Z |
dc.date.issued.fl_str_mv |
2019-02-28 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
LAGO, Fernanda Scussiato. Estudo numérico e experimental de parâmetros de vibração em lajes de concreto. 2019. 164 f. Dissertação (Mestrado em Engenharia Civil e Ambiental) - Universidade de Passo Fundo, Passo Fundo, RS, 2019. |
dc.identifier.uri.fl_str_mv |
http://tede.upf.br:8080/jspui/handle/tede/1744 |
identifier_str_mv |
LAGO, Fernanda Scussiato. Estudo numérico e experimental de parâmetros de vibração em lajes de concreto. 2019. 164 f. Dissertação (Mestrado em Engenharia Civil e Ambiental) - Universidade de Passo Fundo, Passo Fundo, RS, 2019. |
url |
http://tede.upf.br:8080/jspui/handle/tede/1744 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.program.fl_str_mv |
-4172961295717007118 |
dc.relation.confidence.fl_str_mv |
500 500 600 |
dc.relation.department.fl_str_mv |
8147033241558623806 |
dc.relation.cnpq.fl_str_mv |
-6274833215046395772 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de Passo Fundo |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Engenharia Civil e Ambiental |
dc.publisher.initials.fl_str_mv |
UPF |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Faculdade de Engenharia e Arquitetura – FEAR |
publisher.none.fl_str_mv |
Universidade de Passo Fundo |
dc.source.none.fl_str_mv |
reponame:Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) instname:Universidade de Passo Fundo (UPF) instacron:UPF |
instname_str |
Universidade de Passo Fundo (UPF) |
instacron_str |
UPF |
institution |
UPF |
reponame_str |
Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) |
collection |
Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) |
bitstream.url.fl_str_mv |
http://tede.upf.br:8080/jspui/bitstream/tede/1744/2/2019FernandaScussiatoLago.pdf http://tede.upf.br:8080/jspui/bitstream/tede/1744/1/license.txt |
bitstream.checksum.fl_str_mv |
84ac620ea8c5275bd01851cc1511adcd bd3efa91386c1718a7f26a329fdcb468 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 |
repository.name.fl_str_mv |
Biblioteca de teses e dissertações da Universidade de Passo Fundo (BDTD UPF) - Universidade de Passo Fundo (UPF) |
repository.mail.fl_str_mv |
biblio@upf.br || bio@upf.br || cas@upf.br || car@upf.br || lve@upf.br || sar@upf.br || sol@upf.br || upfmundi@upf.br || jucelei@upf.br |
_version_ |
1796784392121614336 |