摘要
在进行地震易损性分析时,针对水平向地震作用下存在动轴力的钢筋混凝土桥墩,探讨了各种损伤指标的适用性,并提出了一种考虑动轴力效应且可对地震需求和地震动强度参数进行回归拟合的单一损伤指标,即约束混凝土外缘的压应变延性比指标,并给出了损伤状态的划分和该指标的适用条件及相应的分析方法。通过实例分析阐明了该指标用于存在动轴力的钢筋混凝土桥墩地震易损分析的合理性和高效性,避免了使用其他可以考虑动轴力效应但需要使用频数统计法生成易损性曲线的损伤指标的繁琐,且约束混凝土发生最大压应变时的轴力范围越小,使用该指标得到的易损性曲线越理想。该应变指标对于存在动轴力的钢筋混凝土桥墩的地震易损性分析具有很大的借鉴价值。
In the seismic vulnerability analysis of bridges,the applicability of various damage indexes is discussed for the reinforced concrete piers with dynamic axial force under horizontal seismic action. A damage index,which considers the dynamic axial force and can be used to do regression analysis of the seismic demand and the ground motion intensity measure,is proposed,that is,the compressive strain ductility ratio of the outer edge of the confined concrete,and the division of the damage state and the applicable conditions of the index,and the corresponding analysis method are given. An example is given to illustrate the rationality and efficiency of the index,and the complexity of other methods which can consider the dynamic axial force but need to use frequency statistics method to generate vulnerability curve is avoided. The smaller the range of axial force when the confined concrete reaches maximum compressive strain is,the better the vulnerability curves obtained by using this index are. The index has significant reference value for seismic vulnerability analysis of reinforced concrete piers with dynamic axial force.
作者
赵人达
赵凌志
占玉林
张磊
ZHAO Renda;ZHAO Lingzhi;ZHAN Yulin;ZHANG Lei(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation,Chengdu 610031,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2018年第4期54-61,共8页
Earthquake Engineering and Engineering Dynamics
基金
国家重点研发计划(2016YFB1200401)
四川省科技计划项目(2017GZ0369)
四川省科技计划资助(2017GZ0052)~~
关键词
桥梁工程
地震易损性
动轴力
损伤指标
钢筋混凝土桥墩
bridge engineering
seismic vulnerability
dynamic axial force
damage index
reinforced concrete piers
