中小跨径箱梁桥荷载试验加载车辆研究

发布时间：2018-03-05 17:53

本文选题：桥梁工程　切入点：中小跨径　出处：《中外公路》2014年03期 　论文类型：期刊论文

【摘要】：荷载试验时,加载车辆形式及重量对加载效率有一定影响。为了确定中小跨径桥梁局部加载试验时所用加载车辆最佳车辆重,以常见的三轴车辆为研究对象,从20、25、30及40m跨径标准简支转连续小箱梁桥中选取最不利悬臂板以及单向板在车辆荷载下进行局部加载验算。通过内力计算、承载能力极限状态计算及抗裂计算,分别研究了最不利板在350、380和400kN加载车辆下的工作特性。结果表明:350kN条件下荷载试验最大轴重与桥梁设计时最大轴重相同,满足相关安全条件;380kN条件下,内力计算和承载能力极限状态计算以及抗裂验算均能满足要求;400kN条件下最不利单向板的抗剪承载力验算已不能满足相关安全条件;380kN为中小跨径桥梁荷载试验的最佳车辆吨位。
[Abstract]:In load test, loading vehicle form and weight have certain influence on loading efficiency. In order to determine the optimum vehicle weight used in local loading test of medium and small span bridges, the common three-axle vehicle is taken as the research object. The most unfavorable cantilever plate and unidirectional plate are selected from the standard simply supported and 40 m span small box girder bridges under vehicle load to check the local load. Through the calculation of internal force, the limit state of bearing capacity and the calculation of crack resistance, the local load checking calculation is carried out. The working characteristics of the most unfavorable plate under 350,380 and 400kN loading vehicles are studied respectively. The results show that the maximum axle load of the load test under the condition of: 350 KN is the same as the maximum axle load in the design of the bridge, and satisfies the relevant safety conditions under the condition of 380 KN. The calculation of internal force, ultimate state of bearing capacity and crack checking can meet the requirements of the test of shear capacity of the most unfavorable unidirectional plate under the condition of 400kN. It can no longer satisfy the relevant safety conditions: 380kN is the best vehicle tonnage for the load test of medium and small span bridges.
【作者单位】：长安大学公路学院旧桥检测与加固技术交通行业重点实验室;西安公路研究院;
【基金】：新世纪优秀人才支持计划项目(编号:NCET-10-0250) 陕西省交通科技项目(编号:10-39K) 中央高校基本科研业务专项基金项目(编号:CHD2012JC030) 教育部新世纪人才支持计划项目(编号:NCET-10-0250)
【分类号】：U441.2

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