斜跨钢箱拱异形人行桥结构静动力计算分析

Static and Dynamic Analysis of Skew Span Steel Box Arch Footbridge

以长春市双阳区石溪河人行桥为研究对象,通过MIDAS/Civil建立全桥有限元模型,分析了该斜跨拱人行桥梁的整体结构静力受力性能,对该斜跨拱人行桥梁动力特性及稳定性进行计算分析。主要结论如下:该斜跨拱人行桥梁跨越能力较大,结构整体刚度较高,结构轻巧,造型独特,施工也相对较为简单,对同类桥梁具有重要参考意义;总体计算表明,成桥状态下该斜跨拱人行桥梁刚度、强度均满足规范要求;该斜跨拱人行桥梁结构一阶竖弯频率为3.345Hz,满足《城市人行天桥与人行地道技术规范》(CJJ 69-95)规定及国际标准化组织规范规定,不宜出现人-桥耦合振动;稳定性计算分析表明,该大跨度斜跨拱人行桥梁一阶失稳特征值系数为106.6,满足规范要求。

This paper takes the stone river pedestrian bridge in Shuangyang district of Changchun as the research object.First,the whole bridge finite element model is established by MIDAS/Civil.The static force performance of the whole structure of the skew arch bridge is analyzed,and then the dynamic characteristics and stability of the bridge are analyzed.The main conclusions are as follows:The leaping capacity of the skew arch bridge is larger,the structure has a higher overall stiffness,the structure is light,the shape is unique,the construction is relatively simple,and it has important reference significance for the same kind of bridge.The overall calculation shows that the stiffness and strength of the bridge in the bridge state can meet the standard.The first order vertical bending frequency of the oblique span arch bridge structure is 3.345Hz,which meets the regulations of the urban pedestrian bridge and the pedestrian tunnel (CJJ 69-95)and the norms of the international standardization organization,and it is not suitable for the coupling vibration of the human bridge.The stability calculation and analysis show that the first order loss of the long-span oblique span arch bridge is lost.The stable eigenvalue coefficient is 106.6,which meets the requirements of the standard.