ABAQUS岩土动力分析的静-动力统一人工边界研究  

Research on the static-dynamic unified artificial boundary of ABAQUS in geotechnical dynamic analysis

作　　者：左得奇 蒋良潍[1,2] 骆达 杜美玲 葛学军[3] ZUO Deqi;JIANG Liangwei;LUO Da;DU Meiling;GE Xuejun(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;MOE Key Laboratory of High-Speed Railway,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]高速铁路线路工程教育部重点实验室,四川成都610031 [3]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《地震工程与工程振动》2022年第2期201-211,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51878560);中铁二院科研项目(2018H0405)。

摘　　要：岩土动力学分析结果可靠性受人工边界条件及动力作用输入方式影响。在剖析ABAQUS无限元静、动力理论基础上,结合二维简单水平地基模型,研究了无限元边界生成初始地应力的计算精度及其改进方法,提出了综合考虑内、外源振动问题的改进静-动力统一人工边界。研究表明:因ABAQUS中无限元缺乏对边界节点力等效约束刚度的校核,其直接应用体力作用下的初始应力计算将产生较大误差继而影响后续结果,需考虑引入有限元静力边界等效节点力加以修正;通过在静、动力计算问题中选取相应的边界等效节点力,改进的无限元静-动力统一人工边界对静力及需要考虑静、动力综合效应的内源、外源问题均具有较好的适用性。The reliability of geotechnical dynamic analysis results depends on artificial boundary conditions and seismic input methods.Based on the analysis of the infinite element static and dynamic theory in ABAQUS,com⁃bined with a two-dimensional simple horizontal foundation model,the calculation accuracy of the infinite element boundary static problem and its optimization method are studied,and an improved static-dynamic unified artificial boundary is proposed.Research shows that due to the lack of checking the equivalent constraint stiffness of the boundary node force,the direct application of infinite element to the calculation of static and internal vibration problems may cause large initial stress errors and then affect the subsequent results,need to introduce the static boundary equivalent nodal force for correction.Research shows that due to the lack of checking the equivalent con⁃straint stiffness of the boundary node force,the direct application of infinite element to the calculation of static and internal vibration problems may cause large initial stress errors and then affect the subsequent results,need to intro⁃duce the static boundary equivalent nodal force for correction.By selecting the corresponding boundary equivalent nodal forces in the static and dynamic calculation problems,the improved infinite element static-dynamic unified artificial boundary has good applicability towards static forces,internal and external seismic problems that need to consider the combined effects of static and dynamic loads.

关 键 词：无限元 静-动力统一人工边界 数值模拟 岩土动力分析 

分 类 号：TU44[建筑科学—岩土工程]