摘要
通过6根钢筋加强ECC柱和1根普通混凝土柱在压-弯-剪-扭复合应力状态下抗震性能试验,研究了构件的滞回曲线、骨架曲线、强度退化、刚度退化以及破坏形态,分析了配箍率、纵筋配筋率、纤维掺量对ECC受扭柱抗震性能的影响。试验结果表明,较普通RC柱,ECC柱的滞回曲线更加饱满,屈服扭矩、极限扭矩以及极限扭率分别提高了64.4%、74.8%、123.3%;试件的纤维掺量从1%提高到2%,延性系数从2.30增至4.04;随着配箍率增大,试件受扭性能增强,较于未配置箍筋的试件,箍筋间距为75 mm的试件延性系数提高了66.2%,极限扭矩提高了34.0%。
Based on the seismic performance test of 6 ECC columns strengthened with steel bars and one ordinary concrete column under the condition of compression bending shear torsion composite stress, the hysteretic curve, skeleton curve, strength degradation, stiffness degradation and failure mode of the component were studied, and the influence of stirrup ratio, longitudinal reinforcement ratio and fiber content on the seismic performance of ECC columns subjected to torsion was analyzed. The results show that the hysteretic curve of ECC column is fuller than that of ordinary RC column,and the yield torque, ultimate torque and limit torsion rate are increased by 64.4%, 74.8% and 123.3% respectively. The fiber content increases from 1% to 2%, the ductility coefficient increases from 2.30 to 4.04. With the increase of stirrup ratio, the torsional performance of specimen is enhanced. Compared with the specimen without stirrup, the ductility coefficient and ultimate torque of specimen with stirrup spacing of 75 mm are increased by 66.2% and 34.0% respectively.
作者
梁肖
邵永健
凌智
王国佐
LIANG Xiao;SHAO Yong-jian;LING Zhi;WANG Guo-zuo(School of civil engineering,Suzhou University of science and technology,215011,China;Zhongyifeng Construction Group Co.,Ltd.,Suzhou 215131,China)
出处
《混凝土与水泥制品》
北大核心
2020年第5期34-37,共4页
China Concrete and Cement Products
基金
2018年江苏省研究生实践创新计划项目(SJCX18_0875)
苏州科技大学研究生科研创新计划项目(SKCX18_005)。
关键词
PVA-ECC
复合受扭
滞回性能
抗震性能
PVA-ECC
Composite torsional
Hysteretic performance
Seismic performance
