摘要
以澜沧江干流某大型地下厂房为研究对象,建立了地下厂房精细化数值仿真模型,利用MATLAB编程实现了地下厂房黏弹性边界施加及地震波输入,通过三维半无限空间算例在脉冲荷载作用下的响应分析,验证了黏弹性边界对能量的耗散作用。根据该地区场地类型和抗震设防烈度,利用厂房设计反应谱拟合人工地震波进行厂房地震动时程分析,得到厂房各部位地震响应加速度、位移及应力值。结果表明:厂房上部结构的加速度、位移响应大于下部结构的,符合地下结构动力响应规律;水流系统结构在承受地震与上部结构荷载作用下,应力值较大,应加强楼板与风罩衔接处、吊物孔周围结构配筋,提高结构抗震性能;通过对厂房黏弹性边界与固定边界条件下的位移响应分析,得到黏弹性边界优于固定边界,说明黏弹性边界具有一定的吸能作用,验证了黏弹性边界应用于地下厂房地震动响应分析的可行性。
This paper takes a large underground powerhouse in the mainstream of the Lancang River as the research object,and a refined numerical simulation model of the underground powerhouse is established.The application of viscoelastic boundary and seismic wave input are realized by MATLAB programming.The energy dissipation effect of viscoelastic boundary is verified by the response analysis of three-dimensional semi-infinite space under impulse load.According to the site type and seismic fortification intensity in this area,the seismic response acceleration,displacement and stress values of each part of the plant are obtained by using the artificial seismic wave fitted by the plant design response spectrum.The results are as follows.Firstly,the acceleration and displacement responses of the upper structure are larger than those of the lower structure,which conform to the dynamic response law of the underground structure.Secondly,under the action of earthquake and superstructure load,the stress value of water flow system structure is larger.It is necessary to strengthen the structural reinforcement at the joint of the floor and the wind cover and around the lifting hole to improve the seismic performance of the structure.Thirdly,through the analysis of the displacement response under the conditions of the viscoelastic boundary and the fixed boundary of the plant,the viscoelastic boundary is better than the fixed boundary.The results show that the viscoelastic boundary has a certain energy absorption effect,which verifies the feasibility of applying the viscoelastic boundary to the seismic response analysis of underground powerhouse.
作者
蒋莉
王磊
周晓岚
许新勇
JIANG Li;WANG Lei;ZHOU Xiaolan;XU Xinyong(School of Water Conservancy,North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Water Resources Efficient Utilization and Guarantee Project Henan Collaborative Innovation Center,Zhengzhou 450046,China;Henan Research Center of Hydraulic Structure Safety Engineering Technology,Zhengzhou 450046,China;Yellow River Water Conservancy Technical Institute,Kaifeng 475001,China)
出处
《华北水利水电大学学报（自然科学版）》
北大核心
2021年第1期82-88,共7页
Journal of North China University of Water Resources and Electric Power：Natural Science Edition
基金
国家自然科学基金项目(51979109)
河南省重点研发与推广项目(192102310015)
河南省科技创新人才计划(174200510020)
河南省高校科技创新团队支持计划项目(19IRTSTHN030)
河南省科技攻关计划项目(162102210074)。
关键词
地下厂房结构
算例验证
黏弹性边界
地震动力分析
underground powerhouse structure
calculation example verification
viscoelastic boundary
seismic dynamic analysis
