重力坝抗震安全评价中有限元梁杆体系新模型的适用性  

Applicability of finite element beam-mass model in seismic safety evaluation of gravity dam

作　　者：李锋[1] 童伟[2] 李建波[1] 林皋[1] 

机构地区：[1]大连理工大学水利工程学院,辽宁大连116023 [2]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《世界地震工程》2012年第3期5-10,共6页World Earthquake Engineering

基　　金：高等学校博士点基金(200801411099);清华大学水沙科学与水利水电工程国家重点实验室开放基金(sklhse-2010-C-03)

摘　　要：传统的材料力学法静动力分析一直是我国重力坝规范规定的重力坝抗震安全评价的基本依据。但为了简化传统经典的重力坝材料力学法模型在动力分析中的复杂度,近年来,随着有限元分析技术的日益推广,许多重力坝有限元梁杆体系新模型在工程界开始得到应用,部分替代了传统材料力学法模型的作用,并在考虑多向地震耦合问题方面体现了一定的优势。从材料力学法的基本定义出发,提出了一种合理的坝面载荷处理模式,并从模态、抗侧力刚度、坝顶位移、内力结果等方面建立适用度指标,对这些有限元新模型进行细致对比,建议了一种最优的有限元梁杆模型,由该模型得到的结果与传统材料力学法的结果吻合,因此可供工程借鉴。The traditional method of strength of material in the static and dynamic analysis has been the fundamen- tal basis for seismic safety evaluation of gravity dam in code of concrete gravity dam design. To simplify the com- plexity of traditional classical method model in dynamic analysis of gravity dam, in recent years, with finite element analysis technology＇ s generalization, many beam-mass new models are used in the engineering field, partly replace the role of traditional method model, and reflect certain advantages in treatment of multi-directional seismic cou- pling problems. In this paper, based on the basic definition of strength of material method, we presented a reasona- ble mode of dam surface load and established suitability indices in respect to mode, shear stiffness, displacement on top of dam, as well as internal force, then do a detailed comparison between these finite element models. A optimal beam-mass model is suggested by comparison, the resalts from which are consistent with that of traditional strength of material method, therefore the model presented can be used for the structure seismic analysis.

关 键 词：重力坝 材料力学法 有限元 梁杆模型 

分 类 号：TV642.3[水利工程—水利水电工程]