基于性能指标综合的重力坝抗震安全评价模型研究  

Study on Seismic Safety Evaluation Models for Gravity Dams Based on Integrated Performance Indicators

作　　者：范文战 朱少坤 陈博 FAN Wenzhan;ZHU Shaokun;CHEN Bo(Guangzhou Pearl Science Institute Engineering Survey and Design Co.,Ltd,Guangzhou 510611,China)

机构地区：[1]广州珠科院工程勘察设计有限公司,广东广州510611

出　　处：《人民珠江》2025年第3期32-38,共7页Pearl River

基　　金：水利部珠江河口动力学及伴生过程调控重点实验室开放研究基金([2017]KJ04)。

摘　　要：现有研究通常通过分析振幅因素来探讨不同评价模型对混凝土重力坝抗震性能评价结果的差异,而忽视了地震动持时的影响,因此未能全面评估不同评价模型对重力坝抗震性能的影响。基于功效系数法,将坝体整体破坏指数和坝顶相对位移进行综合,构建了重力坝地震综合破坏评价模型。以Koyna重力坝为研究对象,分析了单一指标模型和多指标综合评价模型下,不同强震持时地震动对坝体地震破坏程度的影响规律,并对比了不同评价模型对重力坝抗震性能的分析结果。结果表明:地震动持时与重力坝破坏程度呈正相关;单一评价指标可能导致坝体破坏程度的评估偏保守或偏危险,使用综合评价模型能更准确地反映强震持时变化对混凝土重力坝破坏程度的影响。Existing studies typically explore the differences in seismic performance evaluation results of different evaluation models for concrete gravity dams by analyzing amplitude factors while neglecting the influence of ground motion duration.As a result,the influence of different evaluation models on the seismic performance of gravity dams can not be evaluated comprehensively.This paper,using the efficacy coefficient method,integrated the overall damage index of the dam body and the relative displacement of the dam crest to construct a comprehensive seismic damage evaluation model for gravity dams.Taking the Koyna gravity dam as the research subject,this paper examined the influence of ground motions with different strong seismic motion durations on the seismic damage degree of the dam body under both single-indicator and multi-indicator evaluation models,and the analysis results of different evaluation models on the seismic performance of gravity dams were compared.The result indicates that ground motion duration is positively correlated with the damage degree of gravity dams,and relying on a single evaluation indicator may lead to conservative or dangerous evaluations of the damage degree of dam bodies.A comprehensive evaluation model can more accurately reflect the influence of variations in strong seismic motion duration on the damage degree of concrete gravity dams.

关 键 词：综合评价指标 强震持时 混凝土重力坝 塑性损伤 功效系数法 

分 类 号：TV312[水利工程—水工结构工程]