变轴力工程用水泥基复合材料RC组合柱抗震性能研究  

Research on seismic performance of ECC⁃RC composite column with variable axial force

作　　者：王永俊 郑小刚 郑易涛 WANG Yongjun;ZHENG Xiaogang;ZHENG Yitao(Zhaotong Zhaole Expressway Investment and Development Co.,Ltd.,Zhaoteng 657000,China;Sichuan Jiaotong University Engineering Testing Consulting Co.,Ltd.,Chengdu 611743,China)

机构地区：[1]昭通市昭乐高速公路投资开发有限公司,昭通657000 [2]四川交大工程检测咨询有限公司,成都611743

出　　处：《建筑结构》2023年第17期104-111,共8页Building Structure

摘　　要：为探究变轴力对工程用水泥基复合材料RC组合柱(简称ECC-RC组合柱)抗震性能的影响,采用ABAQUS模拟恒定轴力作用下ECC-RC组合柱的拟静力试验,通过模拟与试验结果的对比分析,验证了有限元建模的准确性。基于此模型,建立19个ECC-RC组合柱以轴力变化幅值与频率、剪跨比及纵筋直径为变量,以承载能力、变形性能及等效黏滞阻尼系数为表征手段,分析了ECC-RC组合柱的抗震性能。研究结果表明:变轴力作用下ECC-RC组合柱的滞回曲线与骨架曲线不再关于原点对称,正向加载时峰值荷载明显高于负向加载时峰值荷载的绝对值,但正向加载时刚度退化更为显著。相比于恒定轴力,变轴力作用下ECC-RC组合柱的屈服位移、极限位移、延性系数及等效黏滞阻尼系数均显著降低。此外,当轴力变化频率与水平位移加载频率不一致时,变轴力会影响延性系数与等效黏滞阻尼系数随剪跨比的变化规律。In order to explore the effect of variable axial force on the seismic performance of engineered cementitious composites RC composite column(ECC⁃RC composite column for short),ABAQUS was used to simulate the quasi⁃static test of ECC⁃RC composite column under constant axial force,and the accuracy of finite element modeling was verified by comparing the simulation and test results.Based on this model,19 ECC⁃RC composite columns were established with the variation amplitude and frequency of the axial force,shear⁃span ratio and longitudinal reinforcement diameter as variables,and the bearing capacity,deformation performance and equivalent viscous damping coefficient as the characterization methods.The seismic performance of ECC⁃RC composite columns was analyzed.The research results show that the hysteresis curve and the skeleton curve of the ECC⁃RC composite column under the action of variable axial force are no longer symmetrical about the origin.The peak load under positive loading is significantly higher than the absolute value of peak load under negative loading,but the stiffness degradation is more significant under positive loading.Compared with the constant axial force,the yield displacement,ultimate displacement,ductility coefficient and equivalent viscous damping coefficient of the ECC⁃RC composite column under the variable axial force are significantly reduced.In addition,When the variation frequency of the axial force is inconsistent with the horizontal loading displacement frequency,the variation of the ductility coefficient and the equivalent viscous damping coefficient with the shear span ratio will be affected by the variable axial force.

关 键 词：ECC-RC组合柱 变轴力 抗震性能 ABAQUS 

分 类 号：TU399[建筑科学—结构工程] U444[建筑科学—桥梁与隧道工程]