基于振动台试验的桥墩复合损伤指标研究  

Study on Composite Damage Index of Bridge Pier based on Shaking Table Test

作　　者：申彦利[1,2] 陈伟湖 魏博 SHEN Yanli;CHEN Weihu;WEI Bo(School of Civil Engineering,Hebei University of Engineering,Handan 056038,China;Hebei Provincial Research Center of Assembly Structural Engineering Technology,Handan 056038,China)

机构地区：[1]河北工程大学土木工程学院,河北邯郸056038 [2]河北省装配式结构工程技术研究中心,河北邯郸056038

出　　处：《防灾减灾工程学报》2021年第5期987-1000,共14页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51378169);河北省高等学校科学技术研究重点项目(ZD20161470)资助。

摘　　要：为更准确描述钢筋混凝土矩形空心桥墩的损伤情况,提出一种综合考虑位移和能量的复合损伤指标。基于9个空心桥墩试件的振动台试验结果,分别计算出各试件的位移损伤指标、弹塑性耗能差率损伤指标以及复合损伤指标,通过对三种损伤指标结果对比以及多地震波作用下结果的统计分析,验证了复合损伤指标的适用性;进一步应用复合损伤指标考察了桥墩配箍率、轴压比、配筋率三种参数的变化对空心桥墩损伤性能的影响。研究结果表明:复合损伤指标值介于位移和弹塑性耗能差率损伤指标值之间,且与单一损伤指标相比,复合损伤指标的离散程度较小;应用复合损伤指标对空心桥墩的损伤进行参数分析可知,当轴压比、配筋率一定时,桥墩的损伤程度随配箍率的增大而降低;当配箍率、配筋率一定时,损伤程度随轴压比的增大而提高;当轴压比、配箍率一定时,损伤程度随配筋率的增大而降低。由此说明,复合损伤指标能够反映参数变化对桥墩损伤性能的影响,具有良好的适用性。To describe the damage of reinforced concrete rectangular hollow pier more accurately,a composite damage index considering displacement and energy was proposed.Based on the shaking table test results of nine reinforced concrete rectangular hollow pier specimens,the displacement damage index,elastic-plastic energy dissipation difference damage index and composite damage index of each specimens were calculated,respectively.The applicability of the composite damage index was verified through the comparison of three damage index results and the statistical analysis of the results under the action of multiple seismic waves.Furthermore,the influence of stirrup ratio,axial compression ratio and reinforcement ratio on damage performance of hollow pier was investigated by using the composite damage index.The results show that the composite damage index values are between displacement and elastic-plastic energy dissipation difference damage index values,and compared with the single damage index,the composite damage index has smaller discreteness.The parameter analyses of hollow pier damage using composite damage index show that the damage degree of piers decreases with the increase of stirrup ratio when the axial compression ratio and reinforcement ratio are constant;the damage degree increases with the increase of axial compression ratio when the stirrup ratio and reinforcement ratio are constant;the damage degree decreases with the increase of reinforcement ratio when the axial compression ratio and stirrup ratio are constant.The results show that the composite damage index can reflect the influence of parameters on the damage performance of piers,and it has good applicability.

关 键 词：矩形空心桥墩 振动台试验 复合损伤指标 适用性 损伤性能 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]