重力坝抗震安全评价中有限元梁杆体系新模型的适用性
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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 fundamental basis for seismic safety evaluation of gravity dam in code of concrete gravity dam design.To simplify the complexity 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 coupling problems.In this paper,based on the basic definition of strength of material method,we presented a reasonable 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.
The traditional method of strength of material in the static and dynamic analysis has been the fundamental basis for seismic safety evaluation of gravity dam in code of concrete gravity dam design.To simplify the complexity 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 coupling problems.In this paper,based on the basic definition of strength of material method,we presented a reasonable 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.
引文
[1]DL_5073—2000.水工建筑物抗震设计规范[S].Specifications for seismic design of hydraulic structures[S].
[2]唐欣薇.基于宏观力学的混凝土破损行为研究[D].北京:清华大学,2008:147—150.TANG Xinwei.Study on damage and fracture behavior of concrete based on macro and meso mechanics[D].Bei Jing:Tsinghua University,2008:147—150.
[3]王良琛.混凝土坝地震动力分析[M].北京:地震出版社,1979.WANG Liangchen.Seismic analysis of concrete dams[M].Bei Jing:Seismological Press,1979.
[4]范书立,陈健云,郭建业.有限元等效应力法在重力坝强度分析中的应用[J].水利学报,2007,38(6).FAN Shuli,CHEN Jianyun,GUO Jianye.Application of finite element equivalent stress method to analyze the strength of gravity dam[J].Journalof Hydraulic Engineering,2007,38(6).
[2]唐欣薇.基于宏观力学的混凝土破损行为研究[D].北京:清华大学,2008:147—150.TANG Xinwei.Study on damage and fracture behavior of concrete based on macro and meso mechanics[D].Bei Jing:Tsinghua University,2008:147—150.
[3]王良琛.混凝土坝地震动力分析[M].北京:地震出版社,1979.WANG Liangchen.Seismic analysis of concrete dams[M].Bei Jing:Seismological Press,1979.
[4]范书立,陈健云,郭建业.有限元等效应力法在重力坝强度分析中的应用[J].水利学报,2007,38(6).FAN Shuli,CHEN Jianyun,GUO Jianye.Application of finite element equivalent stress method to analyze the strength of gravity dam[J].Journalof Hydraulic Engineering,2007,38(6).
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