空间主缆自锚式悬索桥扭转特性与扭转效应试验研究

发布时间：2018-01-05 22:32

本文关键词：空间主缆自锚式悬索桥扭转特性与扭转效应试验研究　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：空间主缆自锚式悬索桥由空缆状态转换为成桥状态的过程中,主缆由于同时受到大小方向不同的三维吊杆力、鞍座与索夹约束力等的作用,使得两鞍座间主缆将发生不同程度的扭转。这种扭转将造成索夹预偏角度的放样不准确,因而需要在体系转换过程中对重量以吨计的索夹的角度进行实时调整,给施工造成较大困难,工期延长。本文围绕国家自然科学基金项目“空间主缆悬索桥自适应的构形与效应协调控制的理论与方法”,以杭州江东大桥主桥为工程背景,对空间主缆自锚式悬索桥截面的扭转特性与扭转效应的规律进行研究,主要内容如下:(1)在综合考虑经济性、模型材料、制作工艺以及实验室条件等的基础上,确定了试验模型的几何缩尺比为1:15;阐述了吊索张拉锚固系统和缆索位形测量装置;提出了主缆截面方位角的概念,建立了主缆截面扭转角几何计算方法;制定了相应的试验方案。(2)建立基于ANSYS的空间主缆有限元模型,改变主缆截面抗扭刚度和索夹横向预偏角两个参数,进行有限元计算分析,对空间主缆扭转特性与扭转效应进行研究,揭示了主缆产生扭转的主要原因。(3)进行了多种索夹预偏角、多种吊杆力大小与方向的试验,采用重力式倾角仪对吊杆力方向与水平面夹角和索夹偏转方向与水平面夹角进行测式,采用新型缆索位形测试系统对主缆截面的空间位置和方位角进行测试。(4)根据试验测试数据,分析不同索夹位置、不同索夹预偏角大小、不同吊杆力大小等参数对主缆截面扭转角的规律影响,得出了相应的结论,揭示了背景工程主缆产生正扭和反扭的原因。(5)对主缆截面扭转角的理论计算值与实测值进行对比分析,研究产生误差的原因,得到了主缆截面扭转特性确定方法与扭转效应规律。
[Abstract]:The main cable of self anchored suspension bridge by the state for the process of conversion of cable bridge state, at the same time by the size of the main cable due to different direction of 3D Suspender Force, saddle and cable clamp binding effect, making the two saddle between the main cable will occur in different degrees. The torsion torsion will cause the cable clip lofting pre bias the angle is not accurate, so need to adjust the cable clamp angle weight tons in the process of system transformation, which is more difficult, to extend the construction period. This paper focuses on the National Natural Science Fund Project "the main cable of suspension bridge with Spatial Adaptive Coordinated control structure form and effect theory and method". The main bridge of Hangzhou Jiangdong Bridge as the engineering background, to study the torsional characteristics of spatial cable self anchored suspension bridge section and torsion effect rule, the main contents are as follows: (1) considering the economy, model material, production The basic process and laboratory conditions, to determine the geometric scale test model is 1:15; expounds the suspender tensioning anchorage system and cable shape measuring device; put forward the concept of the main cable section azimuth, calculation method of main cable section torsion angle geometry; set up the appropriate test program (. 2) the establishment of the main cable of the finite element model of ANSYS based on the spatial change of main cable section torsional stiffness and lateral angle of cable clamp pre two parameters, finite element analysis, the spatial main cable torsion characteristic research and torsion effect, reveals the main causes of torsion of the main cable (3) was carried out. Clip cable pre angle variety test of various suspender force magnitude and direction, using gravity inclinometer of Suspender Force direction angle with the horizontal plane and cable clamp direction deflection angle with the horizontal plane was measured, using a new type of cable configuration testing system for main cable section The spatial position and azimuth test. (4) according to the test data, the analysis of different positions of different cable clamp, cable clamp preformed angle size, the influence of different parameters on the size of Suspender Force of main cable section torsion angle, draw the corresponding conclusions, reveals the main cable engineering background is twisting and anti torsion the reason. (5) of the main cable section torsion angle values of theoretical calculation are compared with the measured value, study on the cause of the error, the main cable section to determine the regularity of the effect of torsion characteristic method and torsion.

【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446.1;U448.25

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