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Master's Dissertation
Document
Author
Full name
Romel Dias Vanderlei
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1999
Supervisor
Committee
Giongo, José Samuel (President)
Agostini, Luiz Roberto Sobreira de
Hanai, João Bento de
Title in Portuguese
Análise experimental de pilares de concreto armado de alta resistência sob flexo compressão reta
Keywords in Portuguese
Concreto de alto desempenho
Flexo compressão
Pilares
Abstract in Portuguese
Com este projeto obteve-se informações sobre o comportamento de pilares submetidos à compressão excêntrica, executados com concreto de alta resistência, com resistência média à compressão de 80 MPa. Os pilares tinham seção transversal retangular de 15 cm x 30 cm, com altura livre de 174 cm. A excentricidade da força foi de 38 cm com plano de ação do momento paralelo ao menor lado. Foram ensaiados seis pilares, onde as variáveis foram as taxas de armaduras transversais e longitudinais. Os pilares foram ensaiados sob a ação de duas forças aplicadas de modos independentes, para maior precisão e controle do posicionamento da força excêntrica. Uma força era aplicada na direção do eixo longitudinal do pilar e outra, paralela a esse, com excentricidade definida. Foram montados dispositivos de vinculações e mecanismos de transferências de forças nos pilares, procurando aproximar as situações de ensaios às do modelo teórico pretendido. As rotações eram liberadas nas extremidades dos pilares, e a seção localizadas na meia altura comportava-se sob flexo compressão reta com pequena excentricidade. Os pilares com menor taxa de armadura transversal, tiveram ruptura frágil da seção transversal central com flambagem das barras das armaduras longitudinais. Os pilares com maior taxa de armadura transversal, apresentaram ruptura com boa ductilidade e esmagamento do concreto do lado mais comprimido. As deformações lidas nas barras das armaduras do lado mais comprimido, no instante da ruptura, ficaram entre 2,3% e 3%. Utilizaram-se modelos teóricos propostos na literatura para obter os valores estimados das forças normais últimas e momentos fletores últimos, comparando-os com os encontrados experimentalmente.
Title in English
Experimental analysis of reinforced high strength concrete columns under eccentric compression
Keywords in English
Columns
Eccentric compression
High performance concrete
Abstract in English
This work presents a study of the behavior of high strength columns under eccentric compression, with concrete cylinder compressive strength of around 80 MPa. The columns studied had cross section area of 15 cm x 30 cm at the test region, and an effective length of 174 cm. The eccentricity of the load was 380 mm and the plan of action of the moment was parallel to the smallest side of the cross section. Six columns were tested. The main variables were the stirrup volumetric ratio and the longitudinal steel ratio. The columns were tested under the action of two independent loads, an axial load and an eccentric load, so that could be precise the positioning of the eccentric load and the control of this action. The axial load was applied on of the longitudinal axis of the columns and the eccentric load was applied with the defined eccentricity. Articulation devices and load application devices were mounted such as to approach the proposed theoretical model as much as possible. The rotations were liberated in the extremities of the columns, and the section behaved under eccentric compression. The columns with smaller stirrup volumetric ratio showed a brittle mode of failure occurring at the central cross section accompanied by the buckling of the longitudinal reinforcement. On the other hand, the columns with larger stirrup volumetric ratio presented ductile failure accompanied by crushing on the most compressed side of the column. The measured longitudinal reinforcement strain on the most compressed side of the columns at the instant of failure were between 2,3% and 3%.Theoretical models proposed in literature were used to obtain values of the maximum axial load and ultimate flexural moment and the result compared with experimental results obtained in the tests.
 
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Publishing Date
2007-08-24
 
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