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Doctoral Thesis
DOI
10.11606/T.18.2016.tde-31032016-121958
Document
Author
Full name
Reginaldo Carneiro da Silva
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2003
Supervisor
Committee
Giongo, José Samuel (President)
El Debs, Mounir Khalil
Fernandes, Gilson Battiston
Hanai, João Bento de
Shehata, Ibrahim Abd El Malik
Title in Portuguese
Vigas de concreto armado com telas soldadas: análise teórica e experimental da resistência à força cortante e do controle da fissuração
Keywords in Portuguese
Concreto armado
Fissuração
Força cortante
Tela soldada
Vigas
Abstract in Portuguese
Este trabalho apresenta uma análise teórica e experimental do desempenho de vigas de concreto armado com telas soldadas com relação à resistência, à força cortante e ao controle da fissuração. O programa experimental englobou cinco séries de vigas com variação dos seguintes parâmetros: largura e altura das vigas, taxa de armadura transversal, taxa de armadura lateral e tipo de ancoragem dos fios verticais da tela no bordo comprimido da viga. Os modelos experimentais foram constituídos por doze vigas VQ (15 x 40 x 305), relação a/d= 2,78 e sete vigas VS (20 x 70 x 540), a/d= 2,66, ambas com seção T (bf = 50 cm e hf = 10 cm). O esquema de ensaio foi de uma viga simplesmente apoiada, com duas forças concentradas aplicadas. A formulação proposta, elaborada com base na teoria do cisalhamento-atrito, considerando a contribuição da armadura lateral na resistência à força cortante, foi analisada mediante os resultados obtidos nos ensaios. Analisaram-se também as aberturas das fissuras de cisalhamento na alma. A contribuição da armadura lateral da tela soldada deve-se à alteração em dois mecanismos resistentes alternativos: aumento da parcela de engrenamento dos agregados afetada pelas menores aberturas das fissuras de cisalhamento na alma e pelo efeito de pino dos fios da armadura lateral nos pontos em que são interceptados pelas fissuras diagonais. De modo geral, as vigas armadas com telas soldadas apresentaram menores aberturas de fissuras de cisalhamento na alma, um panorama de fissuração mais sistemático e maior reserva de resistência nas proximidades do colapso.
Title in English
Reinforced concrete beams with welded wire mesh: theoretical-experimental analysis of the shear strength and the control of cracking
Keywords in English
Beams
Crackling
Reinforced concrete
Shear
Welded wire fabric
Abstract in English
This work presents a theoretical-experimental analysis of performance shear design and cracking control in reinforced concrete beams with welded wire mesh. The experimental program consisted of five series of beams with variation of the following parameters: width and depth of the beam, transversal reinforcement ratio, lateral reinforcement ratio and type of stirrup anchorage in beam compression zone. The tested specimens comprised of twelve beams VQ (15 x 40 x 305), shear span-to-depth a/d= 2,78 and seven beams VS (20 x 70 x 540), a/d= 2,66, both with T transversal section (bf = 50 cm e hf = 10 cm). The test setup was a simply supported beam, with two concentrated forces applied. The proposed model was based on shear friction, which took account of the lateral reinforcement contribution on shear design. This model was compared with the test results. It was also studied the shear crack widths on the web beam. The lateral reinforcement contribution is provided by two alternative strength mechanisms: the increasing of portion agreggate interlock affected by smaller diagonal crack widths and the dowel effect of lateral reinforcement wires intercepted by diagonal plane failure. Generally, the welded wire fabric beams presented smaller inclined shear cracks, a better cracking configuration and higher strength reserve close to colapse.
 
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Publishing Date
2016-03-31
 
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