基于可靠度理论的中小跨径桥梁卡车载重限值研究

发布时间：2018-01-21 05:13

本文关键词： 桥梁工程中小跨径桥梁卡车载重限值可靠度理论 WIM　出处：《工程力学》2017年08期 　论文类型：期刊论文

【摘要】：卡车载重限值标准直接影响实际汽车荷载水平及其分布特性以及桥梁等基础设施的服役性能。为分析中小跨径桥梁的卡车载重限值问题,该文首先基于可靠度理论建立卡车载重限值分析模型;其次,基于长期记录的WIM(Weigh in Motion)数据分析我国典型公路路段卡车荷载特性并确定需要进行载重限值研究的重载卡车车型,并根据我国当前中小跨径桥梁建设现状选择对卡车载重限值起控制作用的桥梁结构类型;最后,建立结构关键截面抗弯功能函数,选择多层次目标可靠指标,对各类型卡车的载重限值进行反向迭代分析,基于分析结果分别讨论目标可靠指标、区域荷载特性对卡车载重限值的影响,以及现行公路治超标准对中小跨径桥梁车辆限载的适用性。分析结果显示:各类型卡车载重限值随着目标可靠指标的增大有明显线性下降趋势;区域卡车荷载特性的差异对卡车载重限值有着不可忽略的影响;现行国家治超标准对中小跨径桥梁车辆限载具有较好的适用性,但建议各地区根据自身实际情况在国家公路治超标准的基础上进行微调。
[Abstract]:The truck load limit standard directly affects the actual vehicle load level and its distribution characteristics as well as the service performance of the infrastructure such as bridges. In order to analyze the truck load limit value of medium and small span bridges. In this paper, the analysis model of truck load limit value is established based on reliability theory. Secondly, based on the long-recorded WIM(Weigh in motion data, the load characteristics of trucks in typical highway sections in China are analyzed and the heavy-duty truck models that need to study the load limit value are determined. According to the current situation of bridge construction in China, the bridge structure type which plays a role in controlling the truck load limit value is selected. Finally, the bending function of the key section of the structure is established, the multi-level target reliability index is selected, the load limit value of each type of truck is analyzed in reverse iteration, and the target reliability index is discussed based on the analysis results. The influence of regional load characteristics on truck load limit. The analysis results show that the load limit value of each type of truck decreases linearly with the increase of target reliability index; The difference of regional truck load characteristics has an important influence on the truck load limit value. The current National Super-control Standard has a good applicability to the vehicle load limit of medium and small span bridges, but it is suggested that each region should make fine adjustment on the basis of the National Highway Super-control Standard according to its actual situation.
【作者单位】：长安大学桥梁与隧道陕西省重点实验室;中交第一公路勘察设计研究院有限公司;石家庄市三环管理处;
【基金】：国家自然科学基金面上项目(51278064) 中央高校基本科研业务费专项资金项目(310821162008) 陕西省自然科学基金项目(2014JQ7234)
【分类号】：U441.2
【正文快照】： 汽车荷载是一种社会性荷载,与风、地震等自然性荷载相比,环保要求、国家或地区的宏观运输政策、货运需求和运力的供需关系、承运人对利润的追逐等均有可能对汽车荷载的实际水平及分布特性造成影响。以上各因素对汽车荷载影响的综合外在表现为重型卡车的数量及其荷载水平呈现逐

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