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.
出处
《土木工程学报》
EI
CSCD
北大核心
2008年第12期61-65,共5页
China Civil Engineering Journal
关键词
自锚式悬索桥
挠度理论
参数分析
矢跨比
self-anchored suspension bridge
deflection theory
parametric analysis
rise-span ratio
作者简介
王志诚，硕士，工程师 E-mail： hpdiwangzc@sina.com王志诚（1983-），男，硕士，工程师。主要从事大跨度桥梁的设计和研究工作。
刘昌鹏（1974-），男，博士研究生，工程师。主要从事桥梁的设计和研究工作。
沈锐利（1963-），男，博士，教授。主要从事大跨度桥梁空间非线性分析及程序开发、车桥耦合振动等相关方向的科研和教学。
