桂平郁江钢桁斜拉桥正交异性桥面系力学分析  

Mechanical Behavior Analysis of Integral Orthotropic Deck System of Steel Truss Cable-Stayed Bridge of Guiping Yu River Grand Bridge on Railway from Nanning to Guangzhou

作　　者：许智焰[1] 单德山[2] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]西南交通大学,成都610031

出　　处：《高速铁路技术》2014年第6期5-9,31,共6页High Speed Railway Technology

摘　　要：结合南宁至广州铁路桂平郁江钢桁斜拉桥工程实例,对其正交异性整体桥面系的力学行为进行分析,得出此类结构的一些规律和结论,可供类似工程借鉴和参考。通过建立该桥整体空间有限元模型,分别采用空间板壳单元,模拟正交异性整体桥面系各构件、受拉空间杆单元模拟斜拉索、空间梁单元模拟桥梁其他构件,用空间有限元方法进行桥面结构的力学行为分析。结果表明:正交异性桥面结构整体性能好,各组成部分受力规律性较强;钢桁梁节间范围内布设多道次横梁并采用小刚度纵梁的结构体系可以有效减弱桥面结构参与主桁的共同作用,使得桥面结构应力水平不高、受力均匀,符合结构受力合理的特点;混凝土道砟槽板拉应力水平较高,应采用高配筋进行控制。The main bridge of the Guiping Yu River Bridge is a steel truss girder cable-stayed bridge with integral ortho-tropic deck system. In this paper, the mechanical behaviors of the deck system have been analyzed by using the finite element method. The deck systems are simulated by spatial plate element and shell element. The cables are stimulated by spatial tensile truss element. Other girder members are stimulated by beam element. The results show that the whole performances of the orthotropic deck system are good;the regularity of each component’s force is clear;the deck struc-ture of using multiple transverse beams and small longitudinal beams within each internode can effectively weaken the in-teraction of deck structure and truss girders to makes the stress of bridge deck structure not high and well-distributed, and high reinforcement ratio for concrete ballast plate should be adopted to control its higher tensile stress.

关 键 词：南广铁路 钢桁斜拉桥 正交异性整体桥面结构 有限元 力学行为 整体性能 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]