基于位移的重力坝地震易损性分析方法  

A deformation-based method for seismic fragility analysis of gravity dam

作　　者：马智勇[1,2] 张伟 周强[1,2] 唐可人[1,2] 

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,南宁530004

出　　处：《振动与冲击》2017年第22期51-58,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51469004);广西十百千人才基金项目(2014202)

摘　　要：针对重力坝地震易损性分析中存在的性能指标参数敏感性大且难以获取、震害等级定量划分困难的问题,提出了基于位移性能指标和相应震害等级划分的重力坝易损性分析方法。选取坝顶和坝颈相对坝踵的顺河向位移作为性能指标,合理选取输入地震波,采用非线性动力时程分析研究了性能指标与破坏形态及结构损伤间的相关性,提出了震害等级的五级划分标准。结合SAC-FEMA的易损性概率分析方法,建立了基于位移的重力坝地震易损性分析方法,可估算重力坝在各级地震作用下出现各级震害的概率,为重力坝抗震设计、地震灾害预测和风险分析提供易损性分析基础。In order to solve the problems of parameter sensitivity of seismic performance indexes,and the difficulty to obtain these indexes and quantitatively determine the grade of seismic damage for gravity dam,a method for fragility analysis of gravity dam based on deformation performance index and the classification of the corresponding seismic damage level were proposed. The horizontal deformations along the river at dam crest and neck relative to heel were both selected as the performance indexes. The correlation between the deformations and failure modes as well as the damage conditions was investigated by using reasonable seismic waves to perform nonlinear dynamic time history analyses. A five-level classification standard of seismic damage was proposed. The procedures for deformation-based seismic fragility analysis were presented by introducing the probabilistic analysis method in SAC-FEMA. The procedures can be employed to guide the design and evaluate the failure probability of gravity dams,and provide basic information on hazard prediction and risk analysis.

关 键 词：重力坝 地震易损性分析 基于位移 性能指标 震害等级 

分 类 号：TV312[水利工程—水工结构工程]