云南金东大桥悬索桥施工控制技术研究

发布时间：2018-04-08 21:12

  本文选题：悬索桥　切入点：主缆线形控制　出处：《东南大学》2015年硕士论文

【摘要】：悬索桥施工控制的核心内容是主缆线形、吊杆长度及加劲梁标高、索鞍预偏量设置等。本文以一座单跨730m钢桁加劲梁悬索桥(云南金东大桥)为工程背景,进行了施工控制关键技术研究,主要研究内容如下：(1)回顾了主缆材料与架设技术的演变以及主缆控制方法的发展,总结了悬索桥施工监测与控制内容及流程,给出了金东大桥的主缆线形测点布置钢桁加劲梁线形及应力监测方案。(2)主缆是悬索桥施工控制的关键。在主缆分段悬链线计算中,结合既有研究推导了分段悬链线索段方程解析式及迭代递推公式。考虑索鞍对主缆端点几何位置的影响,修正了既有主索鞍及散索鞍切点坐标计算公式。完善了标准悬索几何参数及内力计算流程,并在此基础上,推演了不同位置索股几何特征参数的计算方法。根据本文算法,用C语言编制了成桥状态主缆几何参数的计算程序,并在MATLAB上运行。本文程序计算结果与相关商业程序计算结果对比吻合较好。(3)结合金东大桥,给出了主缆、加劲梁、桥塔及成桥状态的施工监控内容和关键参数的计算方法。(4)进行了悬索桥成桥线形的影响参数误差分析,分析结果表明,主缆弹性模量误差及加劲梁恒载误差对主缆无应力长度的影响比较显著。如对金东大桥,当弹性模量变化±5%时,主缆无应力长度变化值达±157mm。若加劲梁恒载变化±5%时,主缆无应力长度变化值达±135mm。但是可通过设置恰当的成品索股锚固拉杆调节长度进行调节。分析还表明,温度对中跨主缆标高影响较大,对本桥为-28mm/℃,而对边跨主缆标高的影响最大值约为-3 mm/℃。
[Abstract]:The key contents of construction control of suspension bridge are main cable shape, length of suspension rod and elevation of stiffened beam, setting of cable saddle pre-deflection and so on.Based on a single span 730m steel truss stiffened girder suspension bridge (Jindong Bridge in Yunnan Province), the key technology of construction control is studied in this paper.The main research contents are as follows: (1) reviewing the evolution of main cable material and erection technology and the development of main cable control method, summarizing the construction monitoring and control content and flow chart of suspension bridge.The main cable is the key to the construction control of the suspension bridge.In the calculation of main cable segment catenary, the analytic formula and iterative recurrence formula of segment catenary clue segment equation are derived in combination with existing research.Considering the influence of cable saddle on the geometrical position of the main cable end point, the formulas for calculating the tangent point coordinates of the existing main cable saddle and the scattered cable saddle are modified.The calculation flow of standard cable geometry parameters and internal forces is improved, and on this basis, the calculation method of geometric characteristic parameters of cable strands in different positions is deduced.According to the algorithm in this paper, a computer program for calculating the geometric parameters of the main cable in the bridge state is compiled with C language, and it is run on MATLAB.The results of this paper are in good agreement with the results of commercial programs.) combined with the Jindong Bridge, the main cable and stiffened beam are given.The construction monitoring contents of the tower and the state of the bridge and the calculation method of the key parameters. 4) the error analysis of the influence parameters of the suspension bridge's alignment is carried out. The analysis results show that,The influence of elastic modulus error of main cable and constant load error of stiffened beam on the unstressed length of main cable is obvious.For the Jindong Bridge, when the elastic modulus changes 卤5, the unstressed length of the main cable changes to 卤157 mm.If the constant load of the stiffened beam changes 卤5, the unstressed length of the main cable changes to 卤135mm.However, it can be adjusted by setting the appropriate length of the finished cable strands.The analysis also shows that the temperature has a great influence on the elevation of the main cable, which is -28mm / 鈩，

本文编号：1723357