大型渡槽有限条法地震反应分析
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摘要
根据有限条法原理,把渡槽槽身划分为若干有限条,推导出渡槽槽身结构的单元刚度矩阵、质量矩阵的显示表达式;采用空间梁单元模拟渡槽支架;联接槽身和支架的盆式橡胶支座采用弹性元件单元模拟。编写程序具体计算了某大型渡槽的自振频率,并用ansys对大型渡槽进行模态分析,对比计算结果验证本文模型的正确性。并计算了大型渡槽结构在3种工况分别输入EL-Centro、Taft、天津地震波3种地震波作用下的地震时程响应。
The aqueduct body is discretely meshed into some strips based on the theory of finite strip method,then explicit formulas of element stiffness and mass matrix of the aqueduct body are derived.The braces of aqueducts are simulated as beam elements.The rubber supports with basin shape linking the brace and the aqueduct body are simulated as spring elements.For a large aqueduct,model analysis was conducted by ansys,and its natural frequency was calculated by compiling program to examine the model.The seismic time-history response of large aqueduct is also studied under three operating conditions with input of EL-Centro wave,Taft wave and Tianjin wave respectively.
The aqueduct body is discretely meshed into some strips based on the theory of finite strip method,then explicit formulas of element stiffness and mass matrix of the aqueduct body are derived.The braces of aqueducts are simulated as beam elements.The rubber supports with basin shape linking the brace and the aqueduct body are simulated as spring elements.For a large aqueduct,model analysis was conducted by ansys,and its natural frequency was calculated by compiling program to examine the model.The seismic time-history response of large aqueduct is also studied under three operating conditions with input of EL-Centro wave,Taft wave and Tianjin wave respectively.
引文
[1]王博.大型渡槽动力建模研究[J].计算力学学报,2000,17(4):468-474.
[2]王博,李杰.大型渡槽结构地震响应分析[J].土木工程学报,2001,34(3):29-34.
[3]徐伟,陈淮,王博,等.考虑流固耦合的大型渡槽动力特性计算[J],水利水电技术,2004,35(4):20-22.
[4]Y.K.Cheung.结构分析的有限条法[M].北京:中国水利水电出版社,1985.
[5]朱伯芳.有限单元法原理与应用[M].北京:中国水利水电出版社,1998.
[2]王博,李杰.大型渡槽结构地震响应分析[J].土木工程学报,2001,34(3):29-34.
[3]徐伟,陈淮,王博,等.考虑流固耦合的大型渡槽动力特性计算[J],水利水电技术,2004,35(4):20-22.
[4]Y.K.Cheung.结构分析的有限条法[M].北京:中国水利水电出版社,1985.
[5]朱伯芳.有限单元法原理与应用[M].北京:中国水利水电出版社,1998.
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