变速率变轴力下钢筋混凝土柱动态力学性能分析  

Analysis of Dynamic Mechanical Properties of Reinforced Concrete Columns under Variable Loading Speeds or Axial Forces

作　　者：梁志全 范国玺[2] 张德尊 LIANG Zhi-quan;FAN Guo-xi;ZHANG De-zun(Guangdong Yuexin Construction Engineer Quality and Safety Co.,Ltd.Dongguan 523000;College of Engineering,Ocean University of China,Qingdao 266100)

机构地区：[1]广东粤信建设工程质量安全检测有限公司,东莞523000 [2]中国海洋大学工程学院,青岛266100

出　　处：《广州建筑》2023年第4期1-4,共4页GUANGZHOU ARCHITECTURE

基　　金：国家自然科学基金项目(52008385);山东省自然科学基金项目(ZR2018BEE041);青岛市博士后人员应用研究项目(861605040024)。

摘　　要：受地震多维性、随机性与结构非对称性等影响,地震作用下,钢筋混凝土(RC)构件往往承受变速率变轴力的复杂荷载作用。基于此,考虑材料应变率效应、箍筋约束效应,采用基于位移的梁柱单元,建立OpenSees有限元模型,开展变速率变轴力下RC柱动态力学性能研究。研究结果表明:加载速率相同时,随着轴压比的提高,RC柱的屈服承载能力和峰值承载能力均增大,但承载能力退化更明显;加载位移较大时,轴压比增大后,RC柱的能量耗散增加。轴压比相同时,随着加载速率的提高,RC柱的承载能力提高,等效黏滞阻尼系数增大,能量耗散增加。Affected by multi-dimensional,random and structural asymmetry of ground motion,reinforced concrete(RC) members often bear complex loads with variable rate and axial force under earthquake action.Based on this,considering the material strain rate effect and stirrup restraint effect,the OpenSees finite element model is established by using displacement-based beam-column element,and the dynamic mechanical properties of RC columns variable rate and variable axial force are studied.The results show that the yield bearing capacity and peak bearing capacity of RC columns increase with the increase of axial compression ratio at the same loading rate,but the bearing capacity deteriorates more obviously.When the loading displacement is large,the energy dissipation of RC columns increases with the increase of axial compression ratio.At the same axial compression ratio,the bearing capacity of RC columns increases with the increase of loading rate,and the equiv alent viscous damping coefficient and energy dissipation increase with the increase of loading rate.

关 键 词：钢筋混凝土柱 加载速率 轴压比 动态力学性能 有限元分析 

分 类 号：TU[建筑科学]