地震作用下钢筋混凝土框架柱延性性能研究  

Study on ductility of reinforced concrete frame columns under earthquake

作　　者：刘科 黄娇 马煜东 苏佶智 张宁 Liu Ke;Huang Jiao;Ma Yu-dong;Su Ji-zhi;Zhang Ning(School of Civil Engineering,Chang'an University,Xi'an 710061,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《工程抗震与加固改造》2020年第2期1-9,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(51578077)。

摘　　要：保证框架柱的延性性能是避免结构在强震作用下发生倒塌破坏的重要前提。本文基于PEER数据库中所收集的123根钢筋混凝土(RC)柱试验数据,研究了轴压比、剪跨比、配箍特征值等参数对位移角的显著性影响,通过回归分析归纳出RC柱位移延性系数的经验公式;借助有限元软件ABAQUS对拟设计的79根RC柱试件进行了低周反复加载,分析了试件位移延性系数与轴压比、剪跨比、截面配筋率等参数之间的关系,同时验证了计算公式的合理性。研究结果表明:随着轴压比的增大,框架柱的位移延性随之减小,当轴压比大于0.50时,位移延性系数的变化幅度逐渐减小;随着剪跨比、配箍率、配筋率的增大,框架柱的位移延性有不同程度的增加;当配箍率增大到2.3%左右,位移延性系数的增长幅度逐渐减小;剪跨比大于4时,配筋率过大位移延性反而减小;位移延性系数计算值与模拟值吻合良好。Ensuring the ductility of the frame column is an important prerequisite for avoiding the collapse of the structure under strong earthquakes.Based on the test data of 123 reinforced concrete(RC) columns collected in the PEER database,the significant effects of parameters such as axial compression ratio,shear span ratio and hoop eigenvalue on the displacement angle are studied.The empirical formula of the displacement ductility coefficient is summarized by regression analysis.The finite element software ABAQUS is used to carry out the low-cycle repeated loading of the 79 RC specimens designed.The relationship of the displacement ductility coefficient and the axial compression ratio,the shear span ratio and the section reinforcement ratio is analyzed,and the rationality of the calculation formula is verified.The results show that as the axial compression ratio increases,the displacement ductility decreases.When the axial pressure ratio is greater than 0.50,the variation of the displacement ductility coefficient gradually decreases.As the shear span ratio,the hoop ratio and the reinforcement ratio increase,the displacement ductility of the frame column increases.When the hooping ratio is increased to about 2.3%,the increase of the displacement ductility coefficient is gradually reduced.When the shear span ratio is greater than 4,the reinforcement ratio is too large and the displacement ductility is reduced.The calculated values of the displacement ductility coefficient agree well with the simulated values.

关 键 词：框架柱 位移角 位移延性系数 数值模拟 

分 类 号：TU375.3[建筑科学—结构工程]