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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。
In view of the fact that the traditional linear elastic model can not accurately simulate the seismic response of RCC gravity dam, the damage model considering nonlinear dam material and the contact nonlinear model considering contact nonlinearity are introduced. The two models are applied In the non-linear seismic response analysis of the Ludila gravity dam, the maximum seismic load that can be sustained by the pre-cracked dam body is calculated using the “crack” criterion of crack penetration in the head of the dam. The results show that under the criterion, the maximum load can be calculated as 1.6 times as large as the design earthquake and 1.5 times as many as the non-linear model respectively. The calculated results are very close and can be used to evaluate the ultimate anti-vibration of RCC gravity dam ability.