Abstract
The primary aim of this research was to analyze the seismic performance of the Guoduo gravity dam. A nonlinear FEM method was implemented to study the deformation, stress, and overall stability of dam under both static and dynamic loading conditions, including both normal and overloading conditions. A dam seismic failure risk control method is proposed based on the cracking mechanism induced by the dynamic load to ensure dam safety and stability. Numerical simulation revealed that (1) under normal static and dynamic loading the symmetry of the displacement distributions is good, showing that the dam abutments and riverbed foundation have good overall stiffness. The stress distribution is a safe one for operation under both normal water loading and seismic loading. (2) Attention should be paid to the reinforcement design of outlets of the diversion dam monoliths, and enhance the capability of sustaining that tensile stress of dam monoliths. (3) The shape of the dam profile has a significant effect on the dynamic response of the dam. (4) By employing the “overload safety factor method,” the overall seismic fortification is as follows:K1=1.5,K2=2~3, andK3=3~4.
Highlights
During the last 30 years, over 2000 dams have been constructed for irrigation, energy production, flood control, and recreation purposes in China
Computational mechanics has made a strong impact on classical continuum mechanics, which includes engineering and structural mechanics [16,17,18]
Pioneering analyses were mostly based on linear elastic fracture mechanics (LEFM)
Summary
During the last 30 years, over 2000 dams have been constructed for irrigation, energy production, flood control, and recreation purposes in China. Valamanesh et al [31] presented an application of the endurance time method for seismic analysis of concrete gravity dams; Omidi et al [32] employed a plastic-damage model using different damping mechanisms to simulate the seismic cracking of concrete gravity dams. Ftima and Leger [33] used rigid block models to analyze the seismic stability of cracked concrete dams All these studies were effective in analyzing the seismic response of dam structures, and many interesting stability assessment related results were obtained. The deformation, stress, cracking risk, and overall seismic stability of the Guoduo were analyzed using a 3D finite element method, under various dynamic and static loadings, and a description is given below. A dam seismic failure risk control method is proposed based on the cracking mechanism induced by the dynamic load to ensure dam safety and stability
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