强震作用下水电站沉沙池右边墙非线性动力时程分析  

Nonlinear dynamic time history analysis of a desilting basin right wall of a hydropower station under strong earthquakes

作　　者：王伟 梁辉 冯径军[1] 范建朋 郭胜山 WANG Wei;LIANG Hui;Feng Jingjun;FAN Jianpeng;GUO Shengshan(Northwest Engineering Corporation Limited,Xi’an 710065,China;China Institute of Water Resources and Hydropower Research,Beijing 100048,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [2]中国水利水电科学研究院,北京100048

出　　处：《中国水利水电科学研究院学报（中英文）》2022年第4期362-368,共7页Journal of China Institute of Water Resources and Hydropower Research

摘　　要：本文基于现有“L型”沉沙池右边墙无质量地基模型的线弹性动力分析研究结果,进一步通过考虑沉沙池右边墙-地基接触非线性以及地基辐射阻尼效应,开展了最大设计地震(MDE,max design earthquake)下的非线性动力分析,综合评估了右边墙墙根抗剪、抗弯性能以及墙体与地基接触面滑动和张开情况,结果表明:MDE作用下,右边墙墙根弯矩时程均低于需求能力比(DCR,demand to capacity ratio)允许值,剪力时程存在一定持时范围超过DCR允许值,有发生剪切破坏的可能性,可以通过在墙体根部配置剪力筋,增强其抗剪性能。此外,地震结束后,沉沙池右边墙-地基接触面最终处于闭合状态,表明其具有较好抗倾覆能力。本文针对沉沙池右边墙开展的非线性动力分析可为抗震设计提供科学依据,亦可为强震区沉沙池结构的抗震分析提供参考。In this paper,a nonlinear dynamic analysis considering the contact nonlinearity of the desilting basin and foundation as well as radiation damping effect under Max Design Earthquake(MDE)condition is carried out based on the linear elastic seismic safety results of the right wall of L-shaped desilting basin.The shear and bending performance as well as the sliding and opening of the wall and the foundation inter⁃face are evaluated under MDE.The results show that under the MDE condition,the bending moment time history of the right wall is within the allowable value,while the shear force time history has a certain dura⁃tion range exceeding the allowable value,which has the possibility of shear failure.It is noted that the shear performance of the right wall can be enhanced by strengthening the shear reinforcement.In addition,the contact surface of the right wall is finally closed after earthquake indicating a good overturning resis⁃tance performance.The nonlinear dynamic analysis of the right wall of the desilting basin provides a scien⁃tific basis for its seismic design and can also provide a reference for seismic analysis of desilting basin structures in strong earthquake areas.

关 键 词：沉沙池右边墙 接触非线性 地基辐射阻尼效应 非线性动力分析 需求能力比 

分 类 号：TV73[水利工程—水利水电工程]