自锚式悬索桥参数影响挠度理论研究  

Parametric effects on self-anchored suspension bridges using deflection theory

作　　者：王志诚[1] 刘昌鹏[2] 沈锐利[3] 

机构地区：[1]中交公路规划设计院有限公司,北京100010 [2]北京工业大学,北京100124 [3]西南交通大学,四川成都610031

出　　处：《土木工程学报》2008年第12期61-65,共5页China Civil Engineering Journal

摘　　要：基于自锚式悬索桥挠度理论计算公式及程序,分析自锚式悬索桥矢跨比、边中跨比、加劲梁竖向抗弯刚度、主梁竖曲线等参数,以及外伸跨的设置与否及设置长度等对结构内力、变形、主缆的活载水平拉力的影响,通过算例计算和理论分析表明:自锚式悬索桥采用相对较大的矢跨比时不仅可以减小加劲梁的活载轴力还可以提高结构的刚度,并且从解析角度解释了矢跨比变化对自锚式悬索桥力学特性的影响;边中跨比的增大,结构的刚度要减小;外伸跨的设置不仅可以起到压重的作用,还可较大幅度地提高结构的整体竖向刚度;自锚式悬索桥外伸跨跨度的变化对自锚式悬索桥边跨和主跨内力影响较小;加劲梁最大竖向位移随着主梁刚度的增加而减小,加劲梁的内力随着主梁的刚度的增加而增加,但增大的幅度很小,而应力却随着梁的刚度的增加而减小;自锚式悬索桥设有竖曲线时结构的刚度有所增大。最终对自锚式悬索桥静力特性进行全面的总结。According to the formulas and program of the deflection theory of self-anchored suspension bridges, the effects of rise-span ratio, side to center span ratio, girder stiffness, as well as if there is outside stretching span and the length of it, on the internal force and the deformation and horizontal tension of the main cable, are studied. Results show that larger rise-span ratio will decrease the axial force of girders due to live load, and increase the structural stiffness. The influence of rise-span ratio to the mechanical performance of self-anchored suspension bridges is explained analytically. The results show that structural stiffness will be decreased with increasing side to center span ratio. Conclusion is also given with regard to outside stretching span and structural stiffness. The static properties of self-anchored suspension bridge are summarized comprehensively.

关 键 词：自锚式悬索桥 挠度理论 参数分析 矢跨比 

分 类 号：TU351[建筑科学—结构工程] U448.25[建筑科学—桥梁与隧道工程]