结构参数对钢混组合桥塔自锚式悬索桥静力性能的影响研究

摘要

To understand the static behavior of self-anchored suspension bridge with steel-concrete composite pylon, the three-dimensional finite element software Midas was employed in this paper and a spatial analysis based on deflection theory was carried out. Meanwhile, the relevant structure parameters in the analysis model were contrasted with each other, including the rise-span ratio of main cable, tensile stiffness of main cable, transverse and vertical flexural stiffness of stiffening beam, the longitudinal flexural stiffness of main pylon. The analysis result shows:( a) The structure displacement lessens as the parameter values progressively increase, and the horizontal tensile force of main cable and the bending moment of stiffening beam present different variation trends. ( b ) The whole static behavior of self-anchored suspension bridge is susceptible to the changes of the main cable's rise-span ratio and tensile stiffness as well as the stiffening beam's vertical flexural stiffness, while basically not susceptible to the changes of the stiffening beam's axial stiffness and the main pylon's longitudinal stiffness.%为了解钢-混组合桥塔自锚式悬索桥的静力特性，根据挠度理论，利用三维有限元软件Midas进行空间分析，对模型中主缆矢跨比、主缆抗拉刚度、加劲梁的横竖向抗弯刚度以及主塔纵向抗弯刚度参数进行横向对比。分析结果显示随着参数值的递增，结构位移在减小，而主缆的水平拉力和加劲梁的弯矩却呈现不同变化趋势，自锚式悬索桥的整体静力特性对主缆矢跨比、主缆的抗拉刚度以及加劲梁的竖向抗弯刚度的变化很敏感，而基本不受加劲梁的轴向刚度和主塔纵向刚度的变化的影响。