个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 大连理工大学水利系主任、海岸和近海工程国家重点实验室副主任、辽宁省工程防灾减灾重点实验室副主任
性别:男
毕业院校:大连理工大学
学位:博士
所在单位:水利工程系
学科:水工结构工程. 防灾减灾工程及防护工程. 岩土工程
联系方式:zoudegao@dlut.edu.cn
电子邮箱:zoudegao@dlut.edu.cn
An extended meshless method for 3D interface simulating soil-structure interaction with flexibly distributed nodes
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论文类型:期刊论文
发表时间:2019-10-01
发表刊物:SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
收录刊物:SCIE、EI
卷号:125
ISSN号:0267-7261
关键字:3D meshless interface; Flexible nodal distribution; Soil-structure interaction; Damage failure analysis; Cross-scale modeling
摘要:In this paper, the meshless method is extended to enable the interaction between soil and structure. The gauss points of meshless interface are generated within the common background meshes shared by both surfaces of the interface. Based on radial point method (RPM), the relative displacement and strain matrix of the gauss points can be represented by the surrounding nodes, thus allowing a flexible nodal distribution to be achieved in the interface. By assembling the "sub-stiffness matrix" of each gauss point together, an overall stiffness matrix of the 3D meshless interface can be obtained. The meshless 3D interface can conveniently couple with the rest of the FE model, including the structure and the soil. Since there is no longer a need to precisely match soil nodes to structural nodes at the interface, the structure and the soil can be meshed independently and connected by a meshless interface, which significantly reduces the workload in 3D modeling. Furthermore, the proposed method can be applied to the construction of a cross-scale model between the soil and the structure, and thus can significantly decrease the number of elements while still achieving detailed analysis in regions of concern. In addition, the novel 3D meshless interface has superior advantages in local mesh optimization by avoiding the need for global re-meshing when only a particular region requires more precision. Since only a portion is re meshed as necessary, most of the original mesh can still be used, thus further reducing workload. Additionally, different interface constitutive models can be applied to simulate the complex soil-structure interaction. Several numerical examples are presented to demonstrate that the 3D meshless interface is an effective and flexible tool for simulating soil-structure interaction.