核心型钢混凝土柱恢复力模型试验研究  

Experimental study of restore force model of CSRC columns

作　　者：刘阳[1] 郭子雄[1] 黄群贤[1] 

机构地区：[1]华侨大学土木工程学院,福建泉州362021

出　　处：《建筑结构学报》2009年第S2期196-201,共6页Journal of Building Structures

基　　金：国家自然科学基金项目(50978107);教育部新世纪优秀人才支持计划项目(NCET-06-0571)

摘　　要：进行了8个核心型钢混凝土(CSRC)柱试件和1个RC柱试件的低周反复加载试验。主要试验参数包括轴压比、核心型钢配钢率和核心型钢截面形式。通过试验结果研究了不同参数对CSRC柱强度、刚度、延性、滞回特性、耗能能力和轴向变形性能等的影响。研究结果表明,设置核心型钢可有效提高RC柱的变形能力、滞回耗能能力和弹塑性阶段竖向承载能力的稳定性,从而可有效提高RC柱的轴压比限值。基于试验结果和前人的研究成果,建立了能够考虑核心型钢配钢率和轴压比对滞回特性影响的核心型钢柱恢复力模型。该模型可以反映CSRC柱在地震反复荷载作用下强度和刚度的退化,试件计算骨架曲线和滞回曲线与试验量测结果吻合良好,可为CSRC结构的弹塑性地震反应分析提供参考。Eight core steel reinforced concrete(CSRC) columns and one RC column were tested under cyclic loading.The main test parameters are axial compression ratio,core steel ratio and section formation of core steel.The effect of these parameters on the strength,stiffness,ductility,hysteretic behavior,energy dissipation capacity and axial deformation behaivor of CSRC columns was investigated based on test results.It is indicated that the deformation capacity,the energy dissipation capacity and the axial stability during plastic deformation phases of RC columns were effectively enhanced when core steel was used,and thus the limit value of axial compression ratio of RC columns can be increased.Based on the experimental results,a restoring force model for shear force-displacement relationship of CSRC columns is proposed,which is capable of considering the effect of core steel ratio and axial compression ratio on the hysteretic behaviour of CSRC columns.The strength deterioration and stiffness deterioration of CSRC columns under earthquake loading can be simulated by this model.Comparisons of analytical and experimental skeleton curves and hysteretic curves show good agreement.This paper can be referenced to the nonlinear analysis of CSRC structures.

关 键 词：核心型钢混凝土柱 轴压比 恢复力模型 强度退化 刚度退化 

分 类 号：TU398.9[建筑科学—结构工程]