The Effect of Shear Sliding of Vertical Contraction Joints on Seismic Response of High Arch Dams with Fine Finite Element Model

Houqun Chen,Hui Liang,Aijing Zhang,Jianxin Liao,Yifu Tian,Shengshan Guo,Hailong Huang,Deyu Li

doi:10.1155/2020/4353609

Abstract

The contraction joints of arch dams with and without shear keys are simplified to be with no-slip condition and with relative sliding condition, respectively. Based on the Lagrange multiplier method, a contact model considering the manner of independent cantilever dead load type with no-slip condition and relative sliding condition is proposed to model the nonlinearities of vertical contraction joins, which is special to the nonlinear analysis of arch dams considering the manner of dead load type. Different from the conventional Gauss iterative method, the strategy of the alternating iterative solution of normal force and tangential force is employed. The parallelization based on overlapping domain decomposition method (ODDM) and explicit message passing using distributed memory parallel computers is employed to improve the computational efficiency. An existing high arch dam with fine finite element model is analyzed to investigate the effect of shear sliding of vertical joints on seismic response of the arch dam. The result shows that the values of maximum principal tensile stress under relative sliding condition are significantly greater than those under no-slip condition.

Highlights

Due to the existence of the thermal stress of mass concrete, arch dams are divided into several dam sections by contraction joints with or without shear keys
The joints with and without shear keys are simplified to be with no-slip condition and with relative sliding condition, respectively. e contact model adopted is discussed with no-slip condition and with relative sliding condition for contraction joints of arch dams considering the manner of independent cantilever dead load type firstly
There is no need to introduce any penalty value for no-slip and relative sliding conditions during the solution process, which avoids the potential stability and uncertainty of numerical calculation caused by parameter selection. e model is special to the nonlinear analysis of arch dams considering the manner of the independent cantilever dead load type

Summary

Introduction

Due to the existence of the thermal stress of mass concrete, arch dams are divided into several dam sections by contraction joints with or without shear keys. Arabshahi and Lotfi [2] employed interface elements based on plasticity to consider joint opening and sliding under earthquake. Omid and Lotfi [4] adopted interface elements to simulate the joint nonlinearity, and the constant tangential penalty value is adopted to model the effect of shear keys. Chen et al [24] completed the seismic analysis of an arch dam including the opening of contraction joints and dam stress distribution using 6 nodes (12CPUS) with the parallel program generated by the software PFEPG [25]. E contact model adopted is discussed with no-slip condition and with relative sliding condition for contraction joints of arch dams considering the manner of independent cantilever dead load type firstly. An existing high arch dam with fine finite element model is analyzed to investigate the effect of shear sliding of vertical joints on seismic response of the arch dam

Analysis Model

Mass Foundation Model with Viscoelastic Artificial Boundary

Parallelization Strategy

Discussion of Results

Conclusions