摘要
为抑制地震荷载作用下梁柱节点剪切裂缝的形成和梁纵向钢筋的滑移,提高梁柱节点抗震性能,采用PVA-钢混杂纤维增强水泥基复合材料替代普通混凝土是可选措施之一。设计8个梁柱节点试件,其中6个试件采用PVA-钢混杂纤维增强水泥基复合材料,2个对比试件分别采用单掺PVA纤维增强水泥基复合材料与普通混凝土,进行拟静力试验以研究混杂纤维的掺加对梁柱节点抗震性能的影响。通过改变纤维掺量,在循环往复荷载作用下,观测试件裂缝开展及破坏过程,研究其滞回性能、骨架曲线、延性性能及耗能能力。试验结果表明:纤维的掺加可有效抑制梁柱节点剪切裂缝的形成与发展,显著提高梁柱节点的承载能力、延性及耗能能力;混杂纤维增强水泥基复合材料梁柱节点在峰值荷载前后的抗震性能均优于单掺PVA纤维增强水泥基复合材料梁柱节点。
In order to restrain the shear crack formation and the slip of the longitudinal reinforcement bars embedded in the beam concrete, replacing ordinary concrete with PVA-steel hybrid fiber reinforced cementitious composite（HyFRCC） is one of the optional measures to improve the seismic performance of reinforced concrete beam-column assemblages. 8 beam-column assemblage specimens were designed to investigate the seismic behavior of HyFRCC beam-column assemblages by quasi-static tests. 6 of them are PVA-steel HyFRCC assemblages, and the other 2 specimens are PVA fiber reinforced cementitious composite assemblage and ordinary reinforced concrete assemblage respectively for comparison. The hysteretic behavior, backbone curve, ductility and energy dissipation capacity were investigated under cyclic load for various fiber content. Experimental results show that the addition of fibers effectively inhibits the formation and development of shear cracks, and the bearing capacity, ductility and energy dissipation capacity of beam-column assemblages are significant improved. The seismic behavior of HyFRCC assemblages is better than that of PVA fiber reinforced cementitious composite assemblage whether before or after peak loading.
作者
韩建平
刘文林
崔明
Han Jianping;Liu Wenlin;Cui Ming(Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China;Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2018年第11期32-40,52,共10页
China Civil Engineering Journal
基金
国家自然科学基金(51578273)
教育部长江学者和创新团队发展计划(IRT_17R51)
关键词
梁柱节点
混杂纤维增强水泥基复合材料
拟静力试验
耗能能力
抗震性能
beam-column assemblage
hybrid fiber reinforced cementitious composite
quasi-static test
energy dissipation capacity
seismic behavior
