混凝土拱坝地震非线性响应中的应变率效应研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (21) : 71-80.

论文

董雨1，王国盛1，王进廷2，杜修力1

作者信息 +

Strain rate effect in seismic nonlinear responses of concrete arch dam

DONG Yu1, WANG Guosheng1, WANG Jinting2, DU Xiuli1

Author information +

文章历史 +

摘要

本文通过引入多轴有效硬化函数和S型率相关强度准则，改进了混凝土损伤塑性（CDP）模型，称为S-CDP模型，能够更加合理地反映混凝土材料的应变率效应和三维塑性变形行为。基于S-CDP模型建立了大岗山拱坝的率相关数值模型。利用所建的率相关数值模型，分析了地震作用下坝体混凝土的应变率分布规律、动态增长因子（DIF）的变化规律以及混凝土应变率效应对坝体动力响应的影响。结果表明，S-CDP模型能够合理反映受拉区混凝土材料的率效应，在PGA=0.557g、PGA=0.663g、PGA=0.836g的地震动荷载作用下，拱坝坝体混凝土的动强度增长最多能达到23%，然而并不能保证坝体混凝土的动强度始终提高20%及以上。在水工建筑物抗震设计时，若将混凝土的动强度提高固定的20%，可能会造成计算的损伤结果与实际的损伤有所偏差，动强度提高固定的20%计算得到的损伤结果相较于本文中采用S-CDP模型计算得到的损伤结果偏大。因此在水工建筑物抗震设计时，推荐选用合适的混凝土率相关本构模型进行计算，以尽可能的保证计算的精确度。

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.

导出引用

董雨1，王国盛1，王进廷2，杜修力1. 混凝土拱坝地震非线性响应中的应变率效应研究[J]. 振动与冲击, 2023, 42(21): 71-80

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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