【作者】 肖海波；

【导师】 俞亚南；

【作者基本信息】 浙江大学 ， 市政工程， 2004， 硕士

【摘要】 目前，自锚式悬索桥在国内的发展很快，但关于自锚式悬索桥力学特性研究方面的文章还不多。 本文根据锚式悬索桥的施工特点，将加劲梁简化为刚性支承连续梁，采用分段悬链线拟合主缆，根据节点力学平衡和变形相容条件，由单元节点力与索单元投影的函数关系式迭代解析方法计算成桥状态主缆的线形和主缆的无应力长度。 采用悬链线单元模拟主缆，考虑梁柱理论的平面梁单元模拟加劲梁、主塔和吊杆。基于成桥线形的分析成果，根据空缆时索夹间主缆的无应力长度应等于成桥时索夹间的无应力长度这一原则设置悬链线单元的参数。充分考虑鞍座顶推，主缆与鞍座的切点变化，临时支座退出工作等因素，根据实际的施工工序，用大变形非线性有限元方法进行施工前进分析。基于合理的施工过程分析模型，进一步讨论吊杆张拉次序优化和施工偏差调整。 根据挠度理论方法推导简化的自锚式悬索桥的挠曲微分方程，用“代换梁”法计算自锚式悬索桥在使用荷载下的内力与变形，并采用有限位移理论来进行静力分析，比较两种方法的计算成果，讨论挠度理论计算自锚式悬索桥的精度。更多还原

【Abstract】 At present, self-anchored suspension bridge is developing quickly. However, there are not many papers that study the mechanical characteristics of self-anchored suspension bridge.According to the construction characteristics of the self-anchored suspension bridge, use rigid support continuous girder modeling stiffening girder and catenary element simulating the main cable. Based on the force equilibrium at each node of the main cable and compatibility of deformation, the main cable shape and the unstressed length of main cable are calculated iteratively utilizing the function between the element projections and cable force components at the ends of the catenary element.Stiffening girder, tower and suspenders are simulated with plane beam elements. Set the parameters of catenary element on the basis of analysis result of main cable shape and the principle that the unstressed length of main cable between suspenders is constant. Giving thoughtful consideration for sheave shoving, movement of tangent points between main cable and the sheaves and the action of temporary supports, non-linear finite element method for forward analysis of construction is presented according to the actual working procedure. Based on the proper analysis model, optimization of suspenders drawing and adjusting of construction divergency are discussed.Simplified deflection differential equation of self-anchored suspension bridge is deduced through deflection theory. Substituent beam method and non-linear finite element method are utilized to calculate internal force and displacements of the self-anchored suspension bridge under live load, compare the result of the two methods and discuss tine precise of deflection theory.更多还原