Strain rate effect in seismic nonlinear responses of concrete arch dam

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (21) : 71-80.

DONG Yu1, WANG Guosheng1, WANG Jinting2, DU Xiuli1

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Abstract

In this paper, the concrete damage plasticity (CDP) model is improved by introducing multiaxial effective hardening function and S-type rate correlation strength criterion. The improved model is called S-CDP model, which can more reasonably reflect the strain rate effect and three-dimensional plastic deformation behavior of concrete materials. Based on S-CDP model, the rate-dependent numerical model of Dagangshan Arch Dam is established. By using the established rate-dependent numerical model, the distribution law of strain rate of dam concrete under earthquake, the change law of dynamic growth factor (DIF) and the influence of concrete strain rate effect on the dynamic response of dam body are analyzed. The results show that the S-CDP model can reasonably reflect the rate effect of concrete materials in tension zone. Under the earthquake loads of PGA=0.557g、PGA=0.663g and PGA=0.836g, the dynamic strength of arch dam concrete can increase by 23% at most, but it can't always guarantee that the dynamic strength of dam concrete will increase by 20% or more. In the seismic design of hydraulic structures, if the dynamic strength of concrete is increased by 20%, the calculated damage results may deviate from the actual damage. Compared with the damage results calculated by S-CDP model in this paper, the damage results calculated by fixed 20% increase in dynamic strength are larger. Therefore, in the seismic design of hydraulic structures, it is recommended to select the appropriate concrete ratio-related constitutive model for calculation, so as to ensure the accuracy of calculation as much as possible.

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arch dam / concrete / strain rate effect / plastic damage model / dynamic growth factor

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DONG Yu1, WANG Guosheng1, WANG Jinting2, DU Xiuli1. Strain rate effect in seismic nonlinear responses of concrete arch dam[J]. Journal of Vibration and Shock, 2023, 42(21): 71-80

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