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.
作者
王伟
梁辉
冯径军
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)
出处
《中国水利水电科学研究院学报（中英文）》
北大核心
2022年第4期362-368,共7页
Journal of China Institute of Water Resources and Hydropower Research
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
right wall of a desilting basin
contact nonlinearity
radiation damping effect
nonlinear dynam⁃ic analysis
demand-capacity ratio
作者简介
王伟(1974-),正高级工程师,主要从事水工设计。E-mail:943810253@qq.com;通讯作者:梁辉(1991-),博士,工程师,主要从事水工结构抗震计算。E-mail:1054305889@qq.com。
