| 李明超,张佳文,张梦溪,闵巧玲,史博文.地震波斜入射下混凝土重力坝的塑性损伤响应分析[J].水利学报,2019,50(11):1326-1338,1349 |
| 地震波斜入射下混凝土重力坝的塑性损伤响应分析 |
| Plastic damage response analysis of concrete gravity dam due to obliquely incident seismic waves |
| 投稿时间：2019-07-31 |
| DOI：10.13243/j.cnki.slxb.20190538 |
| 中文关键词: 混凝土重力坝 地震波斜入射 塑性损伤模型 地震破坏评价模型 黏弹性人工边界 |
| 英文关键词: concrete gravity dam oblique incidence of seismic waves plastic damage model seismic damage assessment model viscous-spring artificial boundary |
| 基金项目:国家自然科学基金项目（51879185）；国家优秀青年科学基金项目（51622904）；天津市杰出青年科学基金项目（17JCJQJC44000） |
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| 中文摘要: |
| 我国西南强震区建设有大量混凝土坝，复杂地形条件下地震波入射角度对混凝土坝动力响应影响较大，然而，目前相关研究以线弹性模型为主，在合理考虑坝体的真实破坏状态方面存在局限性。本文以Koyna混凝土重力坝为研究对象，建立三维非线性有限元分析模型，采用了基于黏弹性边界的地震波动输入方法，结合塑性损伤模型分别分析了地震P波和SV波斜入射下坝体的动力响应，并提出地震破坏评价模型对震后坝体损伤进行评估。研究表明，地震波入射角度及波型对坝体动力响应影响较大，P波入射下位移应力和损伤在60°时达到最大，SV波入射下在0°时达到最大，证明了考虑地震波入射角的必要性；采用塑性损伤本构结合损伤评价指标合理地反映了坝体破坏程度，并针对薄弱地区提出抗震设计改进。因此，在同类型工程的安全评价中应该综合考虑地震波斜入射和筑坝材料的非线性特征。 |
| 英文摘要: |
| Many concrete dams are constructed in meizoseismal area of southwest China. The dynamic response of concrete dams in complex topography condition are greatly influenced by incident angle of seismic waves. However,the related researches are mainly based on linear elastic models,which is not exactly in accordance with the actual situation. In this research, a 3D nonlinear FEM model is established based on the Koyna concrete gravity dam. The viscous-spring artificial boundary is used in the inputting of the seismic wave. The plastic damage model is adopted to analyze the dynamic response of the dam body to the oblique incidence of seismic P wave and SV wave respectively. Besides, a seismic damage assessment model is put forward to assess the damage of dams. The results show that the incident angle and type of seismic wave have a great impact on the dynamic response of the dam body. Moreover, the displacement,stress,and damage caused by P wave reach the maximum when the angle is 60°;and the displacement, stress, and damage caused by SV wave reach the maximum when the angle is 0°. Therefore, it is necessary to take the incident angle of seismic wave into consideration. It also demonstrates that the damage degree of the dam body can be reasonably evaluated by combining the plastic damage constitutive model and the damage evaluation index. Therefore,the complex input mechanism of ground motion and the dynamic resistance of materials should be comprehensively considered in the safety evaluation of similar engineering projects. |
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