基于改进的Lee-Fenves模型的混凝土堆石坝抗塑性损伤数值分析

Seismic Analysis and Numerical Analysis of Concrete Rockfill Dam Based on Improved Lee-Fenves Model

结合原型观测试验,分析改进的Lee-Fenves模型在混凝土堆石坝塑性损伤分析的适用性。结合工程实例研究表明,相比于传统Lee-Fenves模型,改进的Lee-Fenves模型引入抗拉曲线,实现了混凝土钢体抗拉应力的动态计算,在混凝土堆石坝应力计算精度上较传统模型有较为明显的改善;通过工程实例原型试验分析,应力比对混凝土堆石坝的弹性强度影响较大,应力比较大,混凝土应力荷载逐步增加,损伤位置上移;当混凝土钢体厚度从200 mm增加至500 mm时,抗震强度增加25%,损伤面积减少30%。在易损区域,应该增加混凝土钢体的厚度,降低塑性损伤。

This paper analyzes the applicability of the improved Lee-Fenves model to the analysis of seismic behavior of concrete rockfill dams based on prototype observation tests. The results show that compared with the traditional Lee-Fenves model,the improved Lee-Fenves model introduces the tensile curve,which realizes the dynamic calculation of the tensile stress of the concrete body.Compared with the conventional method,the stress calculation accuracy of the concrete rockfill dam The model has obvious improvement. Through the engineering prototype test,the stress ratio has little influence on the elastic strength of concrete rockfill dam,the stress is relatively large,the stress load of concrete increases gradually and the damage position moves upwards. When the thickness of concrete body increases from 200 mm When it is increased to 500 mm,the seismic strength increases by 25% and the damage area decreases by 30%. In the seismic vulnerable area,the thickness of the concrete body should be increased to ensure the seismic performance.