T形RC异形柱节点抗震性能有限元分析  

Finite element analysis of seismic performance of T-shaped RC special-shaped column nodes

作　　者：张学辉[1] 郭龙鑫 周洁 ZHANG Xuehui;GUO Longxin;ZHOU Jie(School of Architectural Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China;Hebei Jiayi Architectural Design Co.,Ltd.,Shijiazhuang 050000,China)

机构地区：[1]河北科技大学建筑工程学院,石家庄050018 [2]河北加壹建筑设计有限公司,石家庄050000

出　　处：《建筑结构》2023年第23期94-102,共9页Building Structure

基　　金：河北省自然科学基金青年项目(E2019208150);河北科技大学教育教学改革研究与实践项目(2022-YB02)。

摘　　要：影响异形柱节点抗震性能的因素较多,改变影响参数进行大量结构试验分析节点受力性能又不切实际。对已有异形柱节点抗震性能试验进行了有限元模拟,通过与试验数据对比验证其合理性后,以轴压比、混凝土强度和配箍率为影响参数分别设计了12个T形RC异形柱节点模型进行有限元分析。结果表明:提高轴压比,可提高梁端极限承载力,轴压比小于0.365时变形能力降低,超过0.365后变形能力又略有提升,轴压比提高后刚度退化加快、耗能能力下降;提升混凝土强度,可增大梁端极限承载力,但混凝土强度等级达到C60后提升效果甚微,且降低了变形能力,刚度退化加快,加载前期耗能能力下降,加载后期耗能能力有所提升;提高节点核心区配箍率,梁端极限承载力略有提高,变形能力提升,刚度退化加快,耗能能力下降。There are many factors affecting the seismic performance of special-shaped column nodes,and it is impractical to change the influencing parameters to analyze the mechanical performance of nodes in a large number of structural experiments.The seismic performance tests of the existing special-shaped column nodes were simulated by finite element method.After comparing with the test data to verify its rationality,12 T-shaped RC special-shaped column nodes were designed for finite element analysis with axial compression ratio,concrete strength and hoop ratio as the influencing parameters.The results show that the ultimate bearing capacity of the beam end can be improved by increasing the axial compression ratio.When the axial compression ratio is less than 0.365,the deformation capacity decreases,and the deformation capacity increases slightly when the axial compression ratio exceeds 0.365.When the axial compression ratio is increased,the stiffness degradation is accelerated and energy dissipation capacity is decreased.Increasing the concrete strength can increase the ultimate bearing capacity of the beam end,but when the concrete strength grade reaches C60,the improvement effect is very little,and the deformation capacity is reduced,the stiffness degradation is accelerated,and the energy dissipation capacity is decreased in the early stage of loading and increased in the late stage of loading.With the increase of hoop ratio in the core area of the node,the ultimate bearing capacity of the beam end is increased slightly,the deformation capacity is increased,but stiffness degradation is accelerated and energy dissipation capacity is reduced.

关 键 词：异形柱节点 抗震性能 参数分析 变形能力 耗能能力 

分 类 号：TU375.4[建筑科学—结构工程]