SEISMIC FRACTURE MODELING OF 3D GRAVITY DAM MONOLITHS USING THE SCALED BOUNDARY FINITE ELEMENT METHOD

被引：0

作者：

Jiang, X. ^{[1
]}

Zhong, H. ^{[2
]}

Li, D. ^{[2
]}

Niu, J. ^{[1
]}

Wu, B. ^{[1
]}

机构：

[1] Nanchang Institute of Technology, Nanchang, China

[2] China Institute of Water Resources and Hydropower Research, Beijing, China

来源：

World Conference on Earthquake Engineering proceedings | 2024年 / 2024卷

关键词：

Crack closure - Crack propagation - Dynamic response - Earthquake effects - Earthquake engineering - Movable dams - Reservoirs (water) - Seismic response - Seismic waves - Stress intensity factors;

D O I：

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中图分类号：

学科分类号：

摘要：

This paper presents the seismic crack propagation analysis of a 3D non-overflow monolith of the Koyna gravity dam with initial cracks considering the effects of dam–reservoir interaction. A numerical model based on the Scaled Boundary Finite Element Method (SBFEM) is proposed to simulate the 3D fracture process of gravity dams. The SBFEM is a semi-analytical method with only the discretization on the boundary and analytical solution in the radial direction. The cracked polyhedrons are modelled by the SBFEM with the salient feature that the stress intensity factors are directly extracted from element stress modes, which are utilized to simulate cracks in the gravity dams. The dynamic equilibrium equations of motion for the dam– reservoir system is solved by the Newmark method to evaluate the dynamic response. The cracking process are then simulated numerically by introducing the 3D crack propagation criteria and local remeshing algorithm. Moreover, the opening and closing behaviour of each crack are monitored continuously during the earthquake. The cracking process and crack profile of the Koyna gravity dam under earthquake shocks are simulated using the developed polyhedral model to verify its validity. The effects of the mesh density on the seismic response are also examined and discussed. © 2024, International Association for Earthquake Engineering. All rights reserved.

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