配置大直径高强钢筋预制柱的抗震性能研究

Experimental investigation and simulation on seismic behavior of prefabricated concrete columns with large diameter and high-yield-strength rebars

根据实际项目设计并制作3根缩尺装配式混凝土框架柱试件,其中1根配置400MPa纵筋,另外2根配置直径32mm的500MPa纵筋,针对上述试件进行拟静力试验,并依据试验结果分析对比其抗震性能;然后在OpenSEES结构分析平台中,建立试件的非线性模型对试验构件进行分析,并与试验结果进行比较。研究结果表明:配置大直径500MPa纵筋试件在极限承载力、骨架特性与刚度退化等方面与配置400MPa纵筋试件相比不存在明显差异,但前者的位移延性系数与耗能系数要小于后者,其位移延性系数可以达到3.0,极限层间位移角可达到1/40,研究结果可以为实际工程项目提供参考。

According to the actual engineering project and the loading conditions of the laboratory,three prefabricated concrete frame column specimens are designed and manufactured,in the one of which the yield strength of longitudinal reinforcements are 400 MPa,and in the other two the yield strength are 500 MPa with a diameter of 32 mm.And the pseudo-static tests of three test specimens are carried out.Based on the test results,the seismic behavior of the test specimens is analyzed.And the nonlinear finite element analysis is carried out in OpenSEES using the fiber model considering the shear interaction.The results show that there is no significant difference between the specimens equipped with large diameter 500 MPa longitudinal bars in terms of ultimate bearing capacity,skeleton characteristics and stiffness degradation compared with specimens equipped with 400 MPa longitudinal bars,but the displacement ductility coefficient and energy dissipation coefficient of the former are less than In the latter,and the displacement ductility coefficient of the specimens equipped with large diameter 500 MPa longitudinal bars can reach 3.0,and the limit interlayer displacement angle can reach 1/40.The research results can provide references for actual engineering projects.