The software ansys6 . 0 is used to analysis the stability of the state after construction of tongwamen bridge , linear method is used in analyzing the finite element model of the bridge , the coeffient of stability of different state after construction is given . on the basis , the effect of different factors such as the arrangement of lateral brace , the sloping angle of arch ribs , the stiffness of bridge deck system , the effect of non - orientedly conservative loadings of the hanger and tie bar etc is discussed . the different coefficients of stability of changing these factors are given , so the factors that are vital to the lateral stability of x - type arches are found , and the rationality of the methods taken to enhance the lateral stability of tongwamen bridge is evaluated 本文应用有限元分析商业软件ansys6 . 0 ，采用线弹性方法，通过对该桥的空间有限元模型进行稳定性分析，得出其成桥运营阶段各种工况下的稳定安全系数。在此基础上，本文还通过有限元模型分析，就拱的矢跨比、吊杆(立柱)的非保向力效应、桥面系的刚度、横撑布置形式、拱肋侧倾角等因素对该桥整体稳定性的影响展开探讨与研究。文中给出了各因素变化情况下的稳定安全系数，指出了对钢管混凝土提篮拱横向稳定性有显著影响的因素及其合理变化范围，并对铜瓦门大桥提高横向稳定性的措施的经济合理性进行了分析。
3 ) based upon analyzing the variation laws of bridge ’ s dynamic features , it is proposed in this paper that structure frequency and mode of vibration should not be used as the “ dynamic index ” of cable force dynamic evaluation , because the variation of structure frequency and mode of vibration resulting from tie bars ’ loss is very small 3 )在分析系杆截面损失时桥梁整体结构的动力特性变化规律的基础上,指出系杆损失引起的整体结构频率及振型的变化很小,不宜作为索力动态评估的“动力指纹” 。
The main structure of caiyuanba yangtze bridge in chongqing , up to date the largest - span tie bar arch bridge , is formed by two side tie bars and one middle tie bar which unite the y - shape rigid framework and arch rid . therefore , tie bars are one of the key components 重庆菜园坝长江大桥是迄今为止世界上跨度最长的系杆拱桥,该桥的两根边系杆和一根中系杆将南北两岸的y型刚构和中间的拱肋连成一个受力整体,构成该桥的主结构,因此系杆是该桥关键受力部位构件之一。
