重载下中小跨径桥梁响应特征、安全评价及限载研究

发布时间：2018-03-24 21:16

本文选题：中小跨径桥梁　切入点：重载交通　出处：《长安大学》2015年硕士论文

【摘要】：重载卡车数量的增长及其运载能力的提高为超载运输的形成、发展提供了萌发与生长的温床,公路桥梁结构的运营安全也由此不断遭受考验。据统计,由车辆超载运输所造成的桥梁垮塌事件约占总量的27%,已经成为仅次于结构施工的第二大桥梁垮塌事件诱导因素。截止2013年底,在我国已建成的公路桥梁中,中小跨径桥梁约占据其中的90%。本文基于104国道浙江绍兴段、河北省宣大高速、沪陕高速上海段长期的交通流监测数据,以随机车流桥梁耦合振动分析系统(Bridge Dynamic ANalysis System)为计算平台,分析重载下典型空心板桥、简支T梁桥、连续箱梁桥的响应特征,并对其运营安全性进行评价,最后基于实际监测的交通流数据,选择公路运输中的常见重载卡车车型,研究中小跨径桥梁对各车型的限载重量。主要研究内容如下:1、基于104国道、宣大高速、沪陕高速长期动态称重(Weigh-in-Motion)数据,对特重车荷载的车型组成、车质量及车辆行驶位置分布特征等荷载参数进行分析;2、建立中小跨径桥梁梁格法有限元模型,并对模型的准确性进行验证,将所建立的有限元模型作为BDANS的桥梁结构输入信息,基于三个地区的WIM数据提取特重车荷载工况,计算特重车荷载工况作用下中小跨径桥梁荷载效应,分析结构的响应特征;3、基于特重车荷载效应的计算结果,对重载交通下中小跨径桥梁内力、位移超限情况,结构的抗裂性能及承载能力安全性进行分析评价;4、选择公路运输中的典型重载卡车车型为研究对象,基于结构可靠度理论确定车辆限载的正弯矩效应阈值,并计算了中小跨径桥梁在不同目标可靠指标下对各车型的限载重量。
[Abstract]:The increase in the number of heavy-haul trucks and the improvement of their carrying capacity provide a breeding ground for the formation and development of overloaded transportation, and the safety of highway and bridge structures is constantly being tested. Bridge collapses caused by overloaded vehicles account for about 27% of the total number, which has become the second leading factor of bridge collapse after structural construction. By the end of 2013, among the highway bridges built in China, The medium and small span bridges account for about 90% of them. Based on the long-term traffic flow monitoring data of Shaoxing section of Zhejiang Province, Xuanda Expressway of Hebei Province and Shanghai section of Shanghai-Shaanxi Expressway, this paper takes the coupled vibration analysis system of random vehicle-flow bridge (Dynamic ANalysis system) as the computing platform. This paper analyzes the response characteristics of typical hollow slab bridge, simply supported T-beam bridge and continuous box girder bridge under heavy load, and evaluates its operation safety. Finally, based on the traffic flow data monitored in practice, the common heavy-duty truck models in highway transportation are selected. The main contents of this study are as follows: 1. Based on the data of 104 National Highway, XuanDa Expressway and Shanghai-Shaanxi Expressway, the model composition of the load of the super heavy vehicle is studied, which is based on the long-term dynamic weighing of Weigh-in-Motion. Based on the analysis of load parameters such as vehicle mass and vehicle driving position distribution, the finite element model of beam lattice method for medium and small span bridges is established, and the veracity of the model is verified. The established finite element model is used as the input information of BDANS bridge structure. Based on the WIM data of three regions, the load conditions of super heavy vehicles are extracted, and the load effects of medium and small span bridges under the load conditions of super heavy vehicles are calculated. The response characteristics of the structures are analyzed, and the calculation results based on the load effects of extra heavy vehicles are analyzed. This paper analyzes and evaluates the internal force and displacement of medium and small span bridges under heavy traffic, the anti-crack performance of the structure and the safety of bearing capacity, and selects the typical heavy-duty truck type in highway transportation as the research object. Based on the theory of structural reliability, the positive moment effect threshold of vehicle load limit is determined, and the load-limiting weight of medium and small span bridges for each type of vehicle is calculated under different target reliability indexes.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U447

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