| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 6.71 MB | Adobe PDF |
Authors
Advisor(s)
Abstract(s)
Neste presente trabalho analisa-se o comportamento de vigas de betão armado (com
secção retangular cheia) sujeitas à torção para baixos níveis de carregamento,
designadamente na zona comportamental correspondente à transição entre o estado não
fissurado e fissurado. O trabalho realizado tem como objetivo elaborar um estudo
comparativo por forma a avaliar, de entre várias propostas de autores, qual a lei constitutiva
para o betão à tração que permite calcular a melhor previsão para o momento torsor de
fissuração e respetiva rotação. Para tal, é utilizada a Generalização do Modelo de Treliça
Espacial com Ângulo Variável (GSVATM) na forma de um aplicativo computacional (Torque
2.0) que permite, de uma forma automática, o cálculo do comportamento teórico global em
vigas de betão armado sujeitas à torção, designadamente através do traçado da curva de
comportamento . Para realizar o estudo comparativo, as várias leis constitutivas para o
betão à tração utilizadas foram implementadas no referido aplicativo computacional através
da linguagem de programação DELPHI.
Para realizar o estudo comparativo, foram selecionados os resultados experimentais
de numerosas vigas de referência encontradas na literatura. A partir desta análise, foi
possível encontrar uma lei constitutiva para o betão à tração, designadamente a lei proposta
por Berlarbi e Hsu em 1994, que permite, através do GSVATM, prever adequadamente o
momento torsor de fissuração e a respetiva rotação.
Com vista a melhorar a previsão do comportamento de vigas de betão armado sujeitas
à torção na fase inicial pós-fissuração, foi ainda apresentada uma base de trabalho futuro. Tal
base de trabalho consiste na introdução de uma modificação na lei constitutiva do betão à
tração, cuja calibração deverá ser alvo de um trabalho futuro.
In this present work is analyzed the behavior of reinforced concrete beams (with rectangular full section) under torsion for low levels of loading, particularly in the behavioral zone associated to transaction between the non-cracked and cracked state. The work realized aims at develop a comparative work in order to evaluate, between others authors proposes, which constitutive law of the tensile concrete allows calculate the best prediction of fissuring torsion moment and associated rotation. For that, is used Generalized Softened Variable Angle Truss-Model (GSVATM) as a computer application (Torque 2.0) that allows, automatically, the calculus of global theoretical behavior on reinforced concrete beams under torsion, particularly by the curve delineation of behavior torque - twist. For realize the comparative study, the various constitutive laws for the tensile concrete that are used was deployed on computer application namely before with the programing language DELPHI. For realize the comparative study, was selected experimental results of many referential beams found on literature. From this analysis, was possible find one constitutive law for the tensile concrete, particularly the law that Berlarbi and Hsu proposes in 1994, that allows, by GSVATM, predict appropriately the fissuring torsion moment and associated rotation. With intent to improve the prediction of reinforced concrete beams under torsion behavior on initial post-fissuring phase, was also presented a future base work. That future base work consists on introduction of a modification in the constitutive law of the tensile concrete, for witch calibration should be target of future work too.
In this present work is analyzed the behavior of reinforced concrete beams (with rectangular full section) under torsion for low levels of loading, particularly in the behavioral zone associated to transaction between the non-cracked and cracked state. The work realized aims at develop a comparative work in order to evaluate, between others authors proposes, which constitutive law of the tensile concrete allows calculate the best prediction of fissuring torsion moment and associated rotation. For that, is used Generalized Softened Variable Angle Truss-Model (GSVATM) as a computer application (Torque 2.0) that allows, automatically, the calculus of global theoretical behavior on reinforced concrete beams under torsion, particularly by the curve delineation of behavior torque - twist. For realize the comparative study, the various constitutive laws for the tensile concrete that are used was deployed on computer application namely before with the programing language DELPHI. For realize the comparative study, was selected experimental results of many referential beams found on literature. From this analysis, was possible find one constitutive law for the tensile concrete, particularly the law that Berlarbi and Hsu proposes in 1994, that allows, by GSVATM, predict appropriately the fissuring torsion moment and associated rotation. With intent to improve the prediction of reinforced concrete beams under torsion behavior on initial post-fissuring phase, was also presented a future base work. That future base work consists on introduction of a modification in the constitutive law of the tensile concrete, for witch calibration should be target of future work too.
Description
Keywords
Betão Armado Gvatm Relações Constitutivas Retangular Cheia Torção Vigas