新型型钢混凝土柱的数值模拟及轴压比限值研究

Ⅰ形和H形等传统配钢形式不能对核心混凝土提供足够约束,型钢混凝土(SRC)柱的抗震性能因此较普通钢筋混凝土柱提高不多,其在高地震烈度区的应用受到限制,作者在此背景下提出两种新型截面型钢混凝土柱。基于ABAQUS工作平台,建立已完成的5个新型柱试验试件的数值分析模型,对其进行循环往复荷载作用下的全过程分析,并将试件的数值计算结果与试验结果进行对比分析,讨论滞回曲线、骨架曲线和型钢应力状态等的对比结果,模拟计算与试验结果吻合较好。在此基础上,分析轴压比、混凝土强度和箍筋间距对柱抗震性能的影响,并研究新型柱在不同抗震等级下的设计轴压比限值,所提建议数值可供规范修订和工程计算参考。

NUMERICAL ANALYSIS AND ULTIMATE AXIAL COMPRESSION RATIO OF NEW STEEL REINFORCED CONCRETE COLUMNS

Seismic performance of traditional steel reinforced concrete(SRC) columns was indistinctively improved relative to RC columns in that I and H shaped steel couldn ’t supply enough constraint for core concrete,hence application of the composite columns is limited in high earthquake intensity region,and two new type steel reinforced concrete columns are proposed based on this background.Numerical models of five specimens which have been completed are established using nonlinear finite element method,and accuracy of the numerical analysis is verified by comparing ABAQUS results with the experiment of five new columns under low cyclic reversed loading,with focus on hysteretic curves,skeleton curves and stress state of steel.In addition,effects of axial compression ratio,concrete strength grade and stirrup spacing on seismic performance of new columns are analyzed,and limited values of axial compression ratio for three seismic grades are proposed,which supply a reference for standard revision and engineering calculation.