基于分块法改进的等效一致粘弹性边界在抗震动力分析中的应用  

Application of Equivalent Viscoelastic Boundary Based Block Method in Anti-Seismic Dynamic Analysis

作　　者：陈子祎 刘文白 CHEN Zi-yia;LIU Wen-baib(a. School of Economics and Managemen;b. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China)

机构地区：[1]上海海事大学经济管理学院,上海201306 [2]上海海事大学海洋科学与工程学院,上海201306

出　　处：《水电能源科学》2018年第4期92-95,共4页Water Resources and Power

基　　金：国家自然科学基金项目(51078228);2013年上海市研究生教育创新计划实施项目(第二批)(20131129)

摘　　要：在结构抗震动力分析中,通常利用等效一致粘弹性边界代替粘弹性边界来模拟无限地基的辐射阻尼效应,但一般将散射波源至整层人工边界中心的距离作为一个常数代入对应参数的理论公式中,导致计算的动力响应会有一定的偏差。为此,提出利用分块法对等效一致粘弹性边界进行修正,即将边界分成一定的块数分别计算散射波源至每一块人工边界中心的距离,以减弱偏差的影响。以某重力坝为例,利用此方法分别计算了分块数取1、5、10、15时对应的关键点位移应变及加速度时程变化,验证了分块法对等效一致粘弹性边界修正的有效性和可行性。In the structural anti-seismic analysis,equivalent consistent elastic boundary was replaced by the viscoelastic boundary to simulate the radiation damping effects of infinite foundation.However,the distance between the scattered wave source and the center of the whole artificial boundary is taken as a constant for the parameter of the theoretical formula,and it causes the deviation of the calculated dynamic response.Therefore,blocking method is proposed to modify the equivalent viscoelastic boundary.Namely,the boundary is divided into a certain number of blocks,and the distance between the scattered wave source and the center of each block is calculated to weaken the influence of the above deviation.Taking agravity dam as an example,the key point displacement and acceleration time-history changes are calculated when the number of block is 1,5,10 and 15.The results show that the blocking method to amend the equivalent viscoelastic boundary is effective and feasible.

关 键 词：等效一致粘弹性边界 分块法 抗震分析 时程分析法 ADINA 

分 类 号：TV312[水利工程—水工结构工程]