重载交通下空心板桥梁承载能力安全性

发布时间：2018-03-11 06:40

本文选题：桥梁工程　切入点：空心板桥梁　出处：《交通运输工程学报》2017年03期 　论文类型：期刊论文

【摘要】：基于河北省宣大高速长达18个月的动态称重数据,从中分离出特重车辆荷载数据,分析了车辆的质量、速度、到达时间与位置等关键荷载参数的分布特性;提取了特重车辆典型车型,分析了各车型轴重分布;采用桥梁动力分析系统对883个特重车辆荷载工况进行动态可视化仿真,通过空心板桥结构响应与设计汽车荷载效应的对比,分析了特重车辆荷载与设计汽车荷载的差异,并通过考虑恒载效应与特重车辆荷载效应的组合,研究了重载下空心板桥梁的承载能力安全性。分析结果发现:正弯矩效应极值与设计值之比达到了2.09,剪力效应极值与设计值之比达到了1.97,说明实际中最大特重车辆荷载已明显超越设计汽车荷载;正弯矩效应均值、剪力效应均值与设计值之比接近1.0,说明实际中平均特重车辆荷载与设计值比较接近;抗弯与抗剪承载力评估指标分别在0.50、0.40上下浮动,其极值分别在0.72、0.50上下浮动,说明按照当前设计水平建造的空心板桥梁能够满足重载交通下的运营安全性,抗弯承载能力较抗剪承载能力具有更大的冗余度;承载能力评估指标随跨径变化未出现明显的增减趋势,说明冗余度水平随跨径的增大基本保持稳定。
[Abstract]:Based on the dynamic weighing data of Xuanda Expressway in Hebei Province for 18 months, the load data of super heavy vehicles are separated, and the distribution characteristics of key load parameters such as vehicle quality, speed, arrival time and position are analyzed. The typical vehicle model of super heavy vehicle is extracted, and the axle load distribution of each vehicle is analyzed. The dynamic visual simulation of 883 special heavy vehicle load conditions is carried out by using the bridge dynamic analysis system, and the structural response of hollow slab bridge is compared with that of the designed vehicle load effect. In this paper, the difference between heavy vehicle load and design vehicle load is analyzed, and the combination of dead load effect and extra heavy vehicle load effect is considered. The safety of the bearing capacity of hollow slab bridge under heavy load is studied. The results show that the ratio of the maximum value of positive moment effect to the design value is 2.09, and the ratio of shear effect extreme value to design value is 1.97, which shows that the maximum truck is in practice. The vehicle load has obviously exceeded the design vehicle load; The mean value of positive moment effect and the ratio of mean value of shear effect to design value are close to 1.0, which indicates that the average load of extra heavy vehicle is close to the design value in practice, and the evaluation index of flexural and shear bearing capacity is about 0.50 ~ 0.40, respectively. The extreme value of the bridge fluctuates around 0.72 ~ 0.50, which indicates that the hollow slab bridge built at the current design level can meet the operational safety under heavy load traffic, and the flexural bearing capacity is more redundant than the shear bearing capacity. There is no obvious increasing or decreasing trend of load capacity evaluation index with span, which indicates that the redundancy level keeps stable with the increase of span.
【作者单位】：长安大学陕西省公路桥梁与隧道重点实验室;浙江交通职业技术学院路桥学院;中交第一公路勘察设计研究院有限公司;
【基金】：国家自然科学基金项目(51278064,51408053)
【分类号】：U441.2

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