基于ANSYS平台的非岩性地基条件下核岛厂房结构三维地震响应分析  

Three-Dimensional Seismic Response Analysis of Nuclear Island Plant Building Structure under Non-Lithology Foundation Conditions Based on ANSYS Platform

作　　者：尹训强[1] 赵文燕 王桂萱[1] YIN Xunqiang;ZHAO Wenyan;Wang Guixun(Civil Engineering R&D Center,Dalian University,Dalian 116622,China)

机构地区：[1]大连大学土木工程技术研究与开发中心,大连116622

出　　处：《结构工程师》2021年第3期63-72,共10页Structural Engineers

基　　金：大连市青年科技之星项目(2020RQ057);国家自然科学基金项目(U1839202;51678100)。

摘　　要：有效模拟无限地基辐射阻尼和近场地基非线性动力特性是非岩性地基条件下核岛厂房结构抗震安全评价的关键因素。首先基于ANSYS分析平台,结合UPFs的二次开发特点,通过创建等价线性单元描述非岩性地基的非线性动力特性,并推导开发一种黏性边界单元模拟无限地基辐射阻尼效应及地震动输入,从而建立了适用于非岩性地基条件下核岛厂房结构三维地震响应分析的计算模型。其次通过开展三维土柱自由场动力分析,与日本成熟的二维软件SuperFLUSH/2D进行对比,研究验证所开发模型的合理性及精确性。最后以国内某拟建非岩性核电场址为例,探讨半无限地基辐射阻尼效应和近场地基非线性动力特性对核电结构地震响应的影响规律,并进一步验证计算模型的工程适用性。研究成果可为类似非岩性地基条件下核电工程结构的抗震安全评价分析提供借鉴与参考。The effective simulation of radiation damping of infinite foundation and nonlinear dynamic characteristics of near-field foundation are the key factors for seismic safety evaluation of nuclear power plant structure under the condition of non-lithology foundation.Based on the ANSYS analysis platform,combined with the secondary development characteristics of UPFs.an equivalent linear element is created to describe the nonlinear dynamic characteristics of non-lithology foundation,and a viscous boundary element is developed to simulate the radiation damping effect of infinite foundation and external ground motion input,thus a calculation model suitable for three-dimensional seismic response analysis of nuclear island factory building structure under non-lithology foundation is established.Furthermore,through the free-field dynamic analysis of three-dimensional soil column,a comparative study is carried out with the Japanese mature two-dimensional software SuperFLUSH/2D to verify the rationality and accuracy of the developed model.Finally,taking a proposed non-lithology nuclear power site in China as an example,the effects of radiation damping effect of infinite foundation and nonlinear dynamic characteristics of near-field foundation on the seismic response of nuclear power structure are discussed,and the engineering applicability of the calculation model is further verified.The research results can provide reference and reference for the seismic safety evaluation and analysis of nuclear power engineering structures under similar non-lithology foundation conditions.

关 键 词：非岩性地基 等价线性单元 黏性边界单元 ANSYS SuperFLUSH/2D 

分 类 号：TU311.3[建筑科学—结构工程]