高拱坝抗震性能评价指标研究
详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文
摘要
随着高海拔、高寒、高烈度地震区水电工程的建设,基于强度的拱坝抗震安全评价标准已无法满足工程实践的需要。本文采用非线性数值分析模型对拱坝进行了地震动IDA(逐步动力增量分析)研究,提出了评价大坝抗震安全性新指标,即:坝体损伤体积比和坝面损伤面积比;结合实际工程分析了地震峰值加速度与坝体位移、坝体损伤体积比和坝面损伤面积比之间的关系。结果表明,相比于已有的拱坝抗震性能评价指标,所提出的坝体损伤体积比和坝面损伤面积比指标,可以更清晰地反映出不同强度地震动作用下的拱坝损伤变化趋势和抗震承载能力,更适合作为评价拱坝抗震性能的指标。
The index based concrete strength for seismic safety evaluation of arch dam has become difficultto meet the requirements of hydropower project construction in high altitude,alpine and high intensity earth-quake region. The IDA(Incremental Dynamic Analysis) was performed to study the nonlinear seismic behav-ior of arch dam. Two new seismic safety evaluation indices of damage area ratio and damage volume ratiowere proposed and the correlations of these two indices and dynamic displacements at different part of archdam with seismic peak acceleration were analyzed. The results show that the proposed damage area ratioand damage volume ratio can reflect the damage evolution trend with earthquake intensities and the seismicbearing capacity more obviously than previous index and more suitable for arch dam seismic safety evaluation.
引文
[1]陈厚群,张艳红.评判混凝土高坝地震灾变的关键问题探讨[J].水利水电科技进展,2011,31(4):8-12.
    [2]王海波,李德玉,陈厚群.高拱坝极限抗震能力研究之挑战[C]//现代水利水电工程抗震防灾研究与进展.2013.
    [3]任青文.灾变条件下高拱坝整体失效分析的理论与方法[J].工程力学,2011,28(s1):85-90.
    [4]涂劲,李德玉,陈厚群,等.大岗山拱坝-地基体系整体抗震安全性研究[J].水利学报,2011,42(2):152-159.
    [5]张社荣,王超,孙博,等.复杂层状岩基上重力坝极限抗震能力评估方法初探[J].天津大学学报,2013,46(3):202-209.
    [6]Lotfi V,Espandar R.Seismic analysis of concrete arch dams by combined discrete crack and non-orthogonal smeared crack technique[J].Engineering Structures,2004,26(1):27-37.
    [7]潘坚文,王进廷,张楚汉.超强地震作用下拱坝的损伤开裂分析[J].水利学报,2007,32(2):143-149.
    [8]陈健云,林皋,胡志强.考虑混凝土应变率变化的高拱坝非线性动力响应研究[J].计算力学学报,2004,21(1):45-49.
    [9]Lee J,Fenves G L.A plastic-damage concrete damage model for earthquake analysis of dams[J].Earthquake Engineering and Structural Dynamics,1998,27(9):937-956.
    [10]DL5073-2000,水工建筑物抗震设计规范[S].
    [11]张楚汉,金峰,沈怀至,等.基于功能的高坝抗震安全与风险评价[M].天津:天津大学出版社,2005.
    [12]范书立,陈健云,王建涌,等.高拱坝振动台地震破坏试验研究及数值仿真[J].岩石力学与工程学报,2009,28(3):467-474.
    [13]钟红,林皋,李红军,等.拱坝地震破坏的模型试验与数值模拟[J].水力发电学报,2010,29(4):148-153.
    [14]陈健云,郑毅.强震下拱坝损伤整体判别指标的初步探讨[J].水利学报,2010,41(7):826-832.

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