基于PSDA的高烈度区斜拉桥地震易损性分析
Seismic vulnerability analysis of cable-stayed bridges in high intensity areas based on PSDA
贾毅 1李琪 2奎智尧 2柳其钱 2韦朝宽2
作者信息
- 1. 昆明理工大学建筑工程学院,云南 昆明 650500;云南省抗震工程技术研究中心,云南 昆明 650500
- 2. 昆明理工大学建筑工程学院,云南 昆明 650500
- 折叠
摘要
通过研究结构地震需求与地震动参数之间的概率关系(PSDA),建立桥梁系统地震易损性曲线.以OpenSees平台进行斜拉桥三维空间建模,通过不同的单元类型模拟各构件的力学性能,并对其进行动力特性分析.在概率地震需求模型和地震损伤评定的基础上建立了斜拉桥不同构件在横桥向地震和纵桥向地震作用下的地震易损性曲线,根据可靠度理论和桥梁构件地震易损性曲线可以得到在桥梁系统地震易损性曲线,为后续的维修加固提供一定的理论基础.因各构件对应支座发生各种损伤的概率大致相同.在地震动强度相同时,该斜拉桥更容易在横向地震的作用下发生破坏.
Abstract
To establish seismic susceptibility curves of bridge systems by studying the probabilistic relationship between structural seismic demand and parameters of ground motions.The three-dimensional spatial modeling of cable-stayed bridges was carried out on the platform OpenSees,and the mechanical properties of each member were simulated by different element types and their dynamic characteristics were analyzed.Based on the probabilistic seismic analysis(PSDA)and seismic damage assessment of bridge model,the seismic susceptibility curves of different members of cable-stayed bridges under the actions of transverse and longitudinal earthquakes along bridge were established.Based on reliability theory and seismic susceptibility curves of members of bridges,seismic susceptibility curves of bridge systems can be obtained,and then provide a certain theoretical basis for subsequent maintenance and reinforcement.The probability of various damages for each member corresponding to the bearing is approximately the same.The cable-stayed bridge is more likely to be damaged under the action of transverse earthquake when the ground vibration strength is the same.
关键词
斜拉桥/概率地震需求分析/地震易损性分析/数值模拟Key words
cable-stayed bridge/probabilistic seismic demand analysis/seismic vulnerability analysis/numerical simulation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据