基于有限元法的大坝抗震安全评价

Anti-seismic Safety Evaluation of Dam based on Finite Element Method

汾河二库初设时按Ⅶ度地震设防,但根据现行规范,工程区地震基本烈度提高至Ⅷ度,需要进行抗震安全复核。本文针对该水库大坝抗震安全,通过大型通用有限元软件ANSYS,建立充分模拟基础及上部结构的三维模型,采用模态分析反应谱法进行地震动力计算分析。结果表明,在Ⅷ度地震情况下,大坝抗震安全满足规范要求。

Fenhe No. 2 Reservoir undergoes earthquake fortification according to degree Ⅶ at the beginning of design. However according to the current specification, and existing basic intensity is improved to degree Ⅶ in project area. It is necessary to review seismic safety. In the paper, aiming at the seismic safety of reservoir dam, a three-dimensional model for fully simulating the foundation and superstructure is established through the large general finite element software ANSYS aiming at seismic safety of reservoir dam. The results show that the seismic safety of the dam meets the code requirements in the case of degree Ⅶ earthquake.