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论文类型：会议论文

发表时间：2017-01-01

收录刊物：CPCI-S

卷号：120

页面范围：355-360

关键字：UHTCC/RC composite beam; shear performance; interfacial debonding; crack width; cracking pattern

摘要：Ultra-high toughness cementitious composite (UHTCC) macroscopically exhibits tensile strain hardening characteristic and excellent crack control ability due to steady development of multiple fine cracks, and therefore can be regarded as a promising repair material. Shear tests were conducted on RC beams repaired in tension zone with four different thicknesses of UHTCC layers to investigate the influence of ductile UHTCC layer on composite shear behavior of RC beam. It was found that the tested UHTCC/RC composite beams showed at least 40% higher shear capacity compared to the control RC beam and the UHTCC layer thickness has little influence on shear capacity. However, a strong influence was presented between UHTCC lay thickness and diagonal crack width. As long as the serious interface delamination developing into the supports zone was avoided, the smaller diagonal crack width can be obtained in UHTCC/RC composite beam. And importantly, the provision of the densely-spaced stirrups in the composite beam was not effective in preventing the occurrence of interface debonding between UHTCC and concrete layer.