孔口闸墩对溪洛渡拱坝静动应力的影响研究  

Nonlinear seismic response analysis on Xiluodu arch dam with orifices and piers

作　　者：李德玉[1,2] 涂劲[2] 欧阳金惠[2] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]中国水利水电科学研究院工程抗震研究中心,北京100048

出　　处：《水利学报》2013年第11期1366-1371,共6页Journal of Hydraulic Engineering

基　　金：水利部公益性行业专项(200901054);中国水利水电科学研究院科研专项(抗集1026;抗集1343)

摘　　要：采用显式有限元结合黏弹性人工边界的地震波动反应分析方法,在计入坝体横缝动态接触非线性影响基础上,对溪洛渡拱坝采用模拟孔口及闸墩结构、仅模拟孔口不模拟闸墩和孔口闸墩结构均不考虑的3种模型进行地震响应分析,研究孔口、闸墩结构和大坝的静态和静动综合应力响应。对比分析结果表明,孔口、闸墩的存在对大坝主体的静动综合应力分布规律影响不大,而孔口闸墩区域位于动态反应较大的坝体中上部,由于闸墩的悬挑及截面变化的复杂性,以及孔口对坝身的削弱作用,这一区域将出现数值较大的拉应力集中区,主要分布于上游闸墩根部和下游面深表孔之间以及顶部大梁位置,在溪洛渡拱坝深孔、表孔抗震设计中应予以重视。A seismic response analysis method was used to study the seismic response of the Xiluodu arch dam, which combined the explicit finite element with the viscoelastic artificial boundary and dynamic con- tact force method, considering three different models, with both orifices and piers, with orifices only, and neither the orifices nor the piers. The study reveals that the presence of the orifice and the pier structure has little effect on the dynamic stress distribution of the dam, while for the orifice and the pier area locat- ed in the upper large dam with larger dynamic response, the tensile stress concentration area will appear due to the overhang of the pier and complexities of cross-sectional variation, as well as opening the weak- ening effect on the dam, which mainly distributed at the root area of the piers upstream, and the area be- tween the deep holes and the top holes downstream and the top beam position. These areas should be paid attention to in the seismic design of the Xiluodu arch dam.

关 键 词：高拱坝 孔口 闸墩 非线性地震响应 

分 类 号：TV312[水利工程—水工结构工程]