摘要
针对城市高架桥桥面铺装结构耐久性问题,在力学分析的基础上对桥面铺装厚度和材料进行优化设计。分析典型城市高架重车率高、综合坡度大带来的重交通荷载等级,构建了典型城市高架连续箱梁结构模型,考虑温度和荷载作用,分析不同模量大小的下面层和上、下面层组合对铺装结构内应力的影响。研究结果表明:下面层模量高,有利于降低横、纵向最大拉应力和最大剪应力。因而为满足温度和荷载应力的综合作用要求,铺装层应具有高弯拉强度,下面层应具有高模量,黏结层应具有高抗剪强度,以降低应力水平,延长铺装寿命。
In order to improve the durability of the pavement structure of the urban concrete bridge, this paper optimized the thickness and the material selection design of bridge deck pavements using the mechanical analysis. This paper analyzed heavy-duty levels and steep slopes and established a model of typical urban bridge continuous box girders, which took the temperature and loads into account. It was able to analyze the effect of the bottom layer with various modulus and pavement structures on the stress of pavement structure. The tests results showed that the increase of modulus of the lower layer was able to reduce the maximum tensile and shear stress. In order to satisfy the requirement of the load and thermal stress, reduce the fatigue stress level, and prolong the life of the pavement layer, the pavement layer should be with high bending strength, lower layer with high modulus, and tack coat with high shear resistant.
出处
《上海公路》
2017年第3期26-30,共5页
Shanghai Highways
基金
江苏省交通运输厅科技项目(2015T14)
关键词
城市高架桥
桥面铺装
结构优化
力学分析
Urban concrete bridge
Bridge deck pavement
Structure optimization
Mechanical analysis
