设计地震作用下拱坝的等效应力应用研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
有限元法由于其适用性强的特点而大量应用于拱坝的应力分析中,但由于有限元法计算结果受网格尺寸和网格形态的影响较大,且易在坝踵和坝趾出现应力集中效应,给拱坝的应力评价带来困难。目前有限元等效应力法多应用于拱坝的静力分析中,但对于拱坝在设计地震作用下的应力分析,仍没有明确的评价标准。本文将有限元等效应力法扩展应用于拱坝的动力分析中,结合沙牌拱坝的工程实例,采用抗震规范的承载能力极限状态设计式对坝体强度进行评价,评价的结果和实际情况较吻合,为等效应力在拱坝动力分析中的应用提供了有益的探索。
With the advantage of good adaptability,the finite element method( FEM) is widely applied to the stress analysis of arch dam. However,as the FEM calculation result is largely impacted by the mesh size and mesh shape,furthermore,the stress concentration effect is prone to occur at the heel and toe of the dam,which can cause some difficulties for the stress evaluation of arch dam. At present,the FEM equivalent stress method is mostly applied to the static analysis of arch dam,and yet no any definite criteria are there for the evaluation of the stress analysis on arch dam under the effect of design earthquake. The FEM equivalent stress method is extendedly applied to the dynamic analysis of arch dam herein,and then the strength of the dam body is evaluated with the ultimate bearing capacity formula given in the relevant specification for seismic design of hydraulic structures in combination with the actual engineering case—Shapai Arch Dam,from which the evaluating result is nearly coincided with that from the actual condition,thus provides a beneficial exploration for the application of the equivalent stress to the dynamic analysis of arch dam.
引文
[1]赵玮.布西拱坝有限元等效应力计算研究[J].陕西水利水电技术,2007,23(2):4-6.
    [2]傅作新,钱向东.有限单元法在拱坝设计中的应用[J].河海大学学报,1991,19(2):8-15.
    [3]朱伯芳.国际拱坝学术讨论会专题综述[J].水力发电,1988(8):49-52.
    [4]李同春,温召旺.拱坝应力分析中的有限元内力法[J].水力发电学报,2002(4):18-24.
    [5]李同春,章杭惠.改进的拱坝等效应力分析方法[J].河海大学学报(自然科学版),2004,32(1):104-107.
    [6]朱伯芳.论混凝土拱坝有限元等效应力[J].水利水电技术,2012,43(4):30-32.
    [7]DL/T 5346—2006,混凝土拱坝设计规范[S].
    [8]李同春,陈会芳,章杭惠,等.网格尺寸对拱坝等效应力分析的影响[J].水利学报,2004(9):83-87.
    [9]朱伯芳,高季章,陈祖煜,等.拱坝设计与研究[M].北京:中国水利水电出版社,2002.
    [10]DL 5073—2000,水工建筑物抗震设计规范[S].
    [11]SL 319—2005,混凝土重力坝设计规范[S].
    [12]陈秋华.沙牌水电站工程震损特点分析[J].水力发电,2009,35(5):15-17.

版权所有:© 2023 中国地质图书馆 中国地质调查局地学文献中心