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Indexed by:期刊论文

Date of Publication:2019-10-01

Journal:SOIL DYNAMICS AND EARTHQUAKE ENGINEERING

Included Journals:SCIE、EI

Volume:125

ISSN No.:0267-7261

Key Words:3D meshless interface; Flexible nodal distribution; Soil-structure interaction; Damage failure analysis; Cross-scale modeling

Abstract: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.