蝴蝶兰异形拱塔斜拉桥受力研究

Stress Research of the Cable-stayed Bridge with Phalaenopsis-like Heteromorphic Arch Tower

蝴蝶兰异形拱塔斜拉桥是一类主塔造型复杂的斜拉桥.为了明确该类桥的受力特点,验算实际工程中主桥结构设计的可行性,结合某工程实例,应用MIDAS/civil有限元分析软件,建立成桥状态下全桥空间杆系模型并计算分析.结果表明,恒载对桥塔受力影响较大且活载和温度荷载对主梁受力影响较大;该桥拱塔边、中主塔结合部为全桥受力最不利位置,根据主塔受力特点,对主塔设计提出优化建议;该桥梁主梁及主塔在各工况下应力均满足规范要求,结构设计可行.

The cable-stayed bridge with phalaenopsis-like heteromorphic arch tower is a kind of cablestayed bridge with complex shape of main tower.In order to clarify the stress characteristics of this kind of bridge and check the feasibility of the main bridge structure design in actual engineering,combined with an engineering example,the Midas/civil finite element analysis software was applied to establish the whole bridge spatial link model and the numerical calculation was analyzed.The results show that the constant load has a great influence on the stress of the bridge tower,and the live load and the temperature load have a great influence on the stress of the main beam.The combination of the side and the middle main tower is the most disadvantageous position,and according to the force characteristics of the main tower,the optimization proposal for the design of the main tower is put forward.The stresses of the main beam and main tower of the bridge all meet the requirements of the standard,and the design of the structure is feasible.