混凝土高坝地震灾变模拟与分析

Seismic collapse analysis of high concrete dam

混凝土高坝是一种地震敏感性结构,在强震作用下有发生倒塌灾变的可能,而地震溃坝所引起的次生灾害往往会带来严重的后果。本文基于损伤力学理论,结合显式非线性有限元技术,对强震作用下混凝土高坝的灾变进行了数值模拟研究。以Koyna混凝土高坝为例,进行了不同峰值地震加速度输入条件下的结构动力非线性模拟。数值模拟结果显示,在抗震设防烈度9度所对应的峰值加速度的地震作用下,Koyna大坝即可能出现倒塌灾变。

The high concrete dam may collapse under severe earthquake and lead to consequent disasters.In the present paper,the damage theory is introduced to represent the damage and failure of concrete. Thedynamic nonlinear analysis of concrete structure is performed by using explicit finite element algorithm. Tak-ing the Koyna dam as a numerical example,the simulating results indicate that the Koyna dam may col-lapse when subjected to the earthquake motion with the peak acceleration |a|max= 0.4 g.