考虑拦污栅-坝体相互作用的混凝土重力坝抗震安全性分析  

Seismic Safety Analysis of Concrete Gravity Dam Considering Trash Rack-Dam Interaction

作　　者：江守燕[1] 杜成斌[1] 洪永文[1,2] 

机构地区：[1]河海大学工程力学系,南京210098 [2]中国水电顾问集团昆明勘测设计研究院,昆明650051

出　　处：《防灾减灾工程学报》2009年第5期530-536,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：973课题(2007CB714104);中国水利水电科学研究院开放研究资金项目(2008538613)资助

摘　　要：对考虑拦污栅-坝体的动力相互作用的弹性连接和刚性连接的拦污栅-坝体以及不作耦联分析的拦污栅-坝体这三种不同模型结构形式的动力特性和动力响应进行了比较分析。研究发现,拦污栅的不同模型结构形式对大坝的抗震安全性分析有重要影响,考虑拦污栅-坝体的动力相互作用后,坝体损伤开裂的程度明显加大,坝顶的水平位移响应也明显提高。按《规范》规定的对拦污栅和坝体不作耦联分析的抗震计算方法,所得结果对坝体是偏于不安全的,而如考虑拦污栅-坝体之间的弹性连接,所得结果则是偏于安全的。Three different models of considering trash rack-dam interaction are introduced for analyzing dynamic characteristics and dynamic response of a concrete gravity dam in this paper. Elastic connection and rigid connection between trash rack and dam, as well as uncoupled interaction of the trash rack and dam have been considered. The results show the models for simulating trash rack-dam interaction all have a great effect on seismic safety analysis of the concrete gravity dam. The crack depth of the dam and the displacement of the dam crest increase obviously with the trash rack-dam interaction. The predicted result according to China Code is biased unsafe for the dam. However, the result considering elastic connection between trash rack and dam is biased safe for the dam.

关 键 词：拦污栅 混凝土重力坝 弹性连接 刚性连接 损伤开裂 动力响应 

分 类 号：P315.9[天文地球—地震学] TV642.3[天文地球—固体地球物理学]