拱形桥塔设计及混凝土方案温差效应比较

广州猎德大桥是新光快速路规划中跨越珠江的一座大型桥梁,本桥方案的亮点在于其独特的桥塔设计.猎德大桥塔身外观为两个贝壳状弧形壳体相扣,设计中考虑了混凝土桥塔、钢桁架桥塔和钢箱桥塔三种结构方案的对比.对于桥梁的温度应力,各国规范都做了详尽规定,但对于类似混凝土桥塔方案中桥塔等非梁混凝土结构温度应力分析没有特别规定,将现有规范应用于此类结构温度应力的分析是否可靠值得研究.对各国规范中温度梯度不同规定做了对照阐述,并建立三维实体单元模型,应用有限元方法按照不同规范对比了结构的温度梯度效应.

Arch Bridge Tower Design and Temperature Gradient Effect of Its Concrete Plan

Guangzhou Liede Bridge is a long-span bridge in the project of Xinguang Express Road.Its highlight lies in its particular design of the bridge tower.The figuration of the tower is made up of two shells.In its design,three styles for the tower are contrasted: concrete tower,steel-truss tower and steel-box tower.The project regulates the saddle position of the concrete tower bridge,its concrete,steel shell and its height of crossbeam,discusses its tower force and displacement,and applies some of the valuable results to the project design.Many countries regulate their specifications in calculating bridge temperature stress in detail,but they do not specify how to calculate the temperature stress of a no-beam construction like a bridge pier or tower.This paper compares different specifications,and according to the specifications selected,analyzes the temperature stress of the concrete tower by employing FEA method and 3D solid element.