混凝土重力坝极限抗震能力初探
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摘要
以Koyna混凝土重力坝为例,进行了地震作用下的开裂破坏计算,确定了脱离混凝土块体的部位、形状;运用能够处理接触大变形问题的直接约束法研究了脱离块体在地震作用下的稳定性;分析了库水及脱离体形状对脱离块体稳定性的影响;并对开裂坝体进行了余震作用下的稳定性分析。分析结果表明,在Koyna原地震动作用下,两种形式的脱离块体都能够保持稳定;在设计水位下,Ⅰ类型脱离块体的极限抗震能力为原Koyna地震动的4倍,而Ⅱ类型脱离块体的极限抗震能力为原Koyna地震动的8倍。
The Koyna concrete gravity dam is selected as an example to study the cracking damage caused by Koyna earthquake. The position and shape of the detached concrete block are computed to determine the stability of the detached block under earthquake and the influence of reservoir water after the shocks with the direct constraint method that is suitable for large deformation contact problems.The results show,that under the factual Koyna earthquake the block and dam remains stable and safe,and that under the design storage level the ultimate seismic capacity of block type Ⅰ is four times of the Koyna earthquake intensity,while type Ⅱ is eight times.
The Koyna concrete gravity dam is selected as an example to study the cracking damage caused by Koyna earthquake. The position and shape of the detached concrete block are computed to determine the stability of the detached block under earthquake and the influence of reservoir water after the shocks with the direct constraint method that is suitable for large deformation contact problems.The results show,that under the factual Koyna earthquake the block and dam remains stable and safe,and that under the design storage level the ultimate seismic capacity of block type Ⅰ is four times of the Koyna earthquake intensity,while type Ⅱ is eight times.
引文
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[4]Haibo wang.Seismic stability of detached concrete block of concrete gravity dam[A].The 14thworld conference on earthquake engineering,2008.
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