| 沈怀至,周元德,王进廷.基于弥散裂缝模型的重力坝简化地震分析[J].水利学报,2007,38(10):1221-1227 |
| 基于弥散裂缝模型的重力坝简化地震分析 |
| Simplified earthquake analysis of concrete gravity dams using smeared crack approach |
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| DOI： |
| 中文关键词: 简化分析 等效地震侧向力 弥散裂缝模型 弧长法 极限承载力 |
| 英文关键词: simplified earthquake analysis equivalent lateral forces smeared crack model modified Riks ultimate seismic bearing capacity |
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| 摘要点击次数: 2018 |
| 全文下载次数: 220 |
| 中文摘要: |
| 基于弥散裂缝模型，将简化地震分析由常规的线弹性分析扩展到考虑材料损伤断裂
行为的非线性模拟，借助弧长法对完整变形破坏过程进行求解。在数值模拟分析中，分别采用动力时程和地震简化分析两种方法对Koyna坝进行研究，结果表明，两种方法的线弹性分析所得最大主应力分布形式基本一致，并且非线性分析中，地震简化分析方法模拟得到的坝体开裂与动力时程分析结果也基本相同，说明基于弥散裂缝模型的地震简化分析可以较好地预测坝体的地震开裂响应。分析中给出的地震荷载系-坝顶位移关系曲线，包括上升段和下降段，反映了弧长法能够模拟地震荷载与位移的完整关系曲线。曲线峰值点给出了Koyna坝最大地震承载力分别为0.55g(向上游)、0.60g(向下游)。从而为判断坝体达到地震承载极限状态提供了明确的依据。 |
| 英文摘要: |
| The equivalent lateral forces are generally used as the substitution of seismic dynamic loads in simplified earthquake analysis of concrete gravity dams. In this paper, elastic simplified earthquake analysis is extended to non_linear analysis using a smeared crack model. The approach is applied to analyze the earthquake response of the Koyna gravity dam. The result shows that the maximum principal stress distributions obtained by dynamic history analysis and simplified earthquake analysis for Koyna gravity dam are consistent with each other. In non-linear analysis, the crack patterns of the dam by using these two methods are also almost identical. It is concluded that the simplified earthquake analys
is presented in this paper is able to predict the cracking of dams subjected to strong earthquakes and provides the basis for judging the critical points of ultimate seismic bearing capacity of dam. |
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