公路路桥过渡段搭板设计参数优化

发布时间：2018-05-30 03:18

本文选题：公路工程 + 桥头搭板　；参考：《北京交通大学学报》2017年03期

【摘要】：以车轮动荷载系数、桥面与引道路面容许台阶高度作为控制指标,建立七自由度车辆模型和过渡段三维动力学模型,分析桥头搭板的不同参数组合下车辆和过渡段的动力特性,提出搭板的优化设计参数,包括搭板厚度、弹性模量、长度和埋深.结果表明,考虑错台时,板厚不小于30cm,弹性模量不小于2.8×10~4 MPa,长度为8.3m能够满足桥头轻微跳车的要求和B级路面的后轮动荷载系数标准;弹性模量为2.8×10~4 MPa,长度为8.3m的条件下,板厚不小于45cm时能够满足A级路面的后轮最大动荷载系数标准;不考虑错台时,板厚为30cm,弹性模量为2.8×10~4 MPa,长度不小于8.3m时能够满足B级路面的前、后轮动荷载系数标准;搭板的埋深对路基累积沉降的影响不显著.建议搭板材质选取C25,长度、厚度分别不小于8.3m和30cm,埋深不大于0.1m,以满足车轮动荷载系数和桥头轻微跳车的要求.
[Abstract]:Taking the dynamic load coefficient of the wheel, the height of the bridge deck and the entrance road face as the control index, the vehicle model of seven degrees of freedom and the three-dimensional dynamic model of the transition section are established, and the dynamic characteristics of the vehicle and the transition section under the different parameters of the bridge head and slab are analyzed. The optimum design parameters, including thickness, modulus of elasticity, length and depth of slab, are proposed. The results show that the thickness of plate is not less than 30 cm, the elastic modulus is not less than 2.8 脳 10 ~ (4) MPa, and the length of 8.3m can meet the requirement of slight jump at bridge head and the criterion of dynamic load coefficient of rear wheel of B class pavement, and the elastic modulus is 2.8 脳 10 ~ (4) MPA, and the length is 8.3 m, when the plate thickness is not less than 30 cm, the elastic modulus is not less than 2.8 脳 10 ~ (4) MPA. When the thickness of slab is not less than 45cm, the maximum dynamic load coefficient standard of A grade pavement can be satisfied, when the plate thickness is 30 cm, the elastic modulus is 2.8 脳 10 ~ 4 MPa, and the length is not less than 8.3m, the dynamic load coefficient standard of B grade pavement can be satisfied when the plate thickness is 30 cm and the elastic modulus is 2.8 脳 10 ~ (4) MPa when the staggered platform is not considered. The influence of overlay depth on the accumulated settlement of subgrade is not significant. It is suggested that C _ 25, length and thickness should be chosen, and the depth of burying should not be greater than 0.1 m, so as to meet the requirement of wheel dynamic load coefficient and slight jump at bridge head.
【作者单位】：北京交通大学土木建筑工程学院;中交公路规划设计院有限公司;
【基金】：交通运输部交通运输建设科技项目(2013318J06200) 中央高校基本科研业务费专项资金(2015JBM064) 教育部留学回国人员科研启动基金(第49批)~~
【分类号】：U416.1;U442.5

【相似文献】