万吨级斜拉桥平转阶段牛腿受力研究

Research on Mechanical Properties of 10,000 Ton Class Cable-stayed Bridge' Bracket Under Level Rotation

以绥芬河斜拉桥转体施工为例,采用通用有限元程序对转体桥梁的重要结构—牛腿进行平转阶段受力研究。研究表明,牛腿在桥梁重力、预应力和牵引力共同作用下,整个结构呈现压应力为主的受力状态;预应力可使牛腿在桥梁转体发生意外倾斜时起到保险作用;牵引力对牛腿受力影响不大,但使牛腿产生了扭转趋势。根据牛腿各部分结构的受力特点及功能将牛腿划分成三个区域,即承重区域、保险区域和牵引区域。

This paper take the Suifenhe cable bridge rotating construction as an example,using the general finite element program research the force of the bracket which is the important structure of the swivel bridge during the flat rotating period.The results show that under the resultant of forces of gravity,prestress and traction,the stress of whole structure of bracket presents compression stress based state;tilt accident happens when rotating the bridge,prestress can play the role of insurance to the bracket;Traction has little effect on the force of bracket,but it make the bracket having the trend to reverse.According to features and functions of every structures of the bracket,the force of the bracket will be divided into three areas,that load-bearing area,insurance area and traction area.