变截面劲性骨架钢筋混凝土拱桥外包混凝土过程中的线形控制方法

发布时间：2018-06-15 12:20

本文选题：桥梁工程 + 线形控制　；参考：《公路交通科技》2017年06期

【摘要】：为研究变截面劲性骨架混凝土拱桥外包混凝土过程中的线形控制方法,以在建广安官盛渠江大桥为例,采用Midas/Civil建立影响线加载模型,利用软件的移动荷载功能,得到拱顶挠度影响线。然后运用MATLAB中的函数拟合功能,利用4阶傅里叶级数对得到的挠度影响线进行拟合,从而建立数学模型。对比分析了有未计入混凝土重量变化的拱顶挠度影响线,结果表明变截面拱较等截面拱在浇注外包混凝土过程中拱顶更易出现向上变形。基于影响线理论及叠加原理,推导了变截面劲性骨架拱桥在浇注外包混凝土过程中拱顶挠度的表达式,并提出若ω=∫L/20f(x)dx0,则不能通过传统平衡浇注法来控制拱顶不出现向上变形的判断准则。最后推导了拱顶压重法和斜拉扣索法的计算公式,并利用Midas/Civil建模分析验证了计算公式的准确性。
[Abstract]:In order to study the linear control method in the process of enclosing concrete of variable cross-section rigid skeleton concrete arch bridge, taking Guanan Guanshengqujiang Bridge under construction as an example, Midas / Civil is used to establish the influence line loading model, and the moving load function of software is used. The deflection influence line of the vault is obtained. Then the function fitting function of MATLAB is used to fit the deflection influence line by using the fourth order Fourier series, and the mathematical model is established. The results show that the arch with variable section is more prone to the upward deformation than the arch with equal section in the process of pouring concrete. Based on the influence line theory and the superposition principle, the expression of arch roof deflection in the process of pouring concrete with variable cross-section stiffness skeleton arch bridge is derived. It is also pointed out that if 蠅 = 41L / 20fU XX _ 0, we can not control the upward deformation of the vault by the traditional balanced pouring method. Finally, the calculation formulas of the dome compression method and the cable-stayed cable method are derived, and the accuracy of the formulas is verified by Midas / Civil modeling analysis.
【作者单位】：重庆交通大学土木工程学院;
【分类号】：U445.4

【相似文献】