强震区碾压混凝土重力坝非线性地震响应分析

针对传统的线弹性模型不能准确模拟强震区碾压混凝土重力坝的地震响应问题,介绍了考虑坝体材料非线性的损伤模型和考虑接触非线性的缝接触模型,并将这两种模型应用于鲁地拉重力坝非线性地震响应分析中,以坝头部的裂缝贯穿为"破坏"准则,计算裂缝贯穿前坝体所能承受的最大地震作用。结果表明,在该准则下,材料非线性模型和接触非线性模型分别算出最大荷载作用为1.6倍设计地震和1.5倍设计地震,计算结果十分接近,均可用来评价碾压混凝土重力坝的极限抗震能力。

Nonlinear Seismic Response Analysis of Roller Compacted Concrete Gravity Dam in Strong Seismic Regions

The traditional linear elastic model can not simulate the nonlinear seismic response analysis of RCC gravity dam in strong seismic regions. Currently, the material damage model and contact model are the most commonly used nonlinear models. In this paper, two models are applied to analyze the nonlinear seismic response of Ludila gravity dam. Taking the fracture penetrating damage of dam crest as criterion, the maximal bearing earthquake of the dam body before the fracture penetrating is calculated. The result shows that the maximum earthquake load is 1.6 times and 1.5 times of the designed earthquake by the material nonlinear model and contact model, respectively. The calculation results given by two kinds of nonlinear model are very close, which can be applied to evaluate the ultimate earthquake resistant behavior of roller compacted concrete gravity dam.