考虑刚性拉杆扭转的斜拉桥侧向弹性稳定性  

Lateral Elastic Stability of Cable-stayed Bridge Considering Torsion of Rigid Rod

作　　者：李自林[1,2] 薛江[1] 邢颖[1] 王剑[1] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]天津城市建设学院天津市软土特性与工程环境重点实验室,天津300384

出　　处：《公路交通科技》2014年第6期101-107,152,共8页Journal of Highway and Transportation Research and Development

基　　金：天津市自然科学基金项目(13JCYBJC19600)

摘　　要：以单承重面刚性拉杆斜拉桥为研究对象,基于主梁刚度无穷大的假定和能量原理推导出带有刚性拉杆考虑扭转变形时斜拉桥侧向弹性稳定系数的解析计算公式。通过对同一算例分别用推导公式、有限元法及其它近似计算公式进行对比计算,推导公式的正确性得到了验证;同时对斜拉桥的结构参数进行分析,讨论了它们对桥塔侧向弹性稳定性系数的影响规律。结果表明:计入刚性拉杆扭转变形后,桥塔侧向弹性稳定系数有所提高,更接近实际情况;桥塔的抗弯刚度对考虑非保向力效应的桥塔侧向弹性稳定性影响较大;当桥塔抗弯刚度较小时,拉杆抗扭刚度对桥塔侧向弹性稳定性影响较大。Taking cable-stayed bridge with single loading plane and rigid rod as the investigative object, based on the assumption of infinite stiffness of the main girder and energy principle, the analytical formula for the lateral elastic stability coefficient of cable-stayed bridge with rigid rods considering the torsional deformation of rigid rod is derived. The correctness of derived formulas is verified by the results of contradistinctive calculation of the same example using derived formula, finite element method and other approximate calculation formulas respectively. Through analyzing the structure parameters of cable-stayed bridge, the influence regularity of the structure parameters on lateral elastic stability coefficient of pylon is discussed. The result shows that （ 1 ） after considering the torsional deformation of rigid rods, the lateral elastic stability coefficient of pylon is increased, which is closer to the actual situation; （2） the flexural rigidity of pylon have greatly effect on the lateral elastic stability of pylon considering non directional force; （3） when the flexural rigidity of pylon is smaller, the torsional rigidity of rod has strong influence on lateral elastic stability of pylon.

关 键 词：桥梁工程 斜拉桥 能量原理 稳定性 刚性拉杆 非保向力 抗扭刚度 

分 类 号：U441[建筑科学—桥梁与隧道工程] TU311.2[交通运输工程—道路与铁道工程]