下承式桁架拱渡槽三维有限元抗震分析

Three-Dimensional Finite Element Seismic Analysis of Open Spandrel Truss Arch Type Prestressed Aqueduct

结合山西省某引水工程下承式桁架拱渡槽结构抗震设计,采用ANSYS软件,建立空间实体有限元分析模型,通过模态分析确定结构固有频率及其振型,由振型分解反应谱原理,求解渡槽整体结构的空间地震响应,并利用渡槽结构的静、动力特性,获得了渡槽各构件控制截面的等效内力,为工程抗震设计提供了可靠依据。

In this paper, a water diversion project that with open spandrel truss arch type pre-stressed aqueduct of structure was designed under seismic by using ANSYS software in Shanxi Province, established the finite element analysis model of the spatial entities, then determining the structural natural frequency and mode shapes through the modal analysis, solved the seismic response of the aqueduct by mode-superposition re- sponse spectrum method, and achieved each component＇ s control section of the aqueduct equivalent and internal force with static and dynamic characteristics, t^roviding a reliable basis for the seismic design of the project.