【作者】 云迪； 张素梅；

【Author】 YUN Di ZHANG Su-mei (Shool of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China)

【机构】 哈尔滨工业大学土木工程学院；

【摘要】 依据工程中常用的横撑布置形式,以依兰牡丹江大桥为原型,设计了六组横向联系各异的模型;并应用 ANSYS 软件,采用子空间法,对各组模型依次进行了模态分析,得到其前五阶频率和振型;在对模态分析结果进行分析比较的基础上,详细讨论了一字撑、X 撑及 K 撑的布置形式对结构动力特性的影响.更多还原

【Abstract】 In this paper,based on the transverse brace arrangement generally applied in concrete-filled steel tubular(CFST) arch bridges,six group CFST arch bridge models were analyzed with the primary consideration for the types of transverse brace arrangement,including the type,the position and the spacing of braces.The analysis models were designed arrcording to the basic parameters of YiLan-Peony River Bridge.Computer program ANSYS was employed to investingate the frirst 5 order of frequencies and vibration modes of the six group models with the help of subspace method.Discussion and comparison were carried out in detail to the effects of ’I’,’X’and ’K’type transverse braces on dynamic repsonse of the arch bridges.Regarding the ’suspen- sion structure’with flexible suspender,it is concluded that the stiffness of the deck system,which greatly influ- enced the sequence of vibration models of the arch bridge,should be considered in the dynamic analysis.Af- ter headroom requirement satisfaction,the transverse brace should have an even distribution,which can im- proved the out-of-plane natural frqeuency of the arch bridge.更多还原