石家庄铁道大学四方学院毕业设计30m箱形梁桥承载力检算研究Research on Checking Bearing Capacity of30m Box Girder Bridge2015届交通工程系专业交通工程学号20155852学生姓名靳彦坤指导教师马亚利完成日期2019年5月日摘要近年以来，车辆超载情况越来越多，且原来越严重，车辆超载可以给路面以及桥梁造成很多不利影响，由于超载可导致桥梁裂缝越来越大，时间久了，桥梁的承载能力必定会因为累积损伤而降低，桥梁的正常使用寿命降低从而达不到使用年限，因此极大可能造成交通事故，故对桥梁的承载能力进行检算研究十分有必要。本文通过查阅相关文献，对研究对象现役跨径30米箱型梁桥承载能力进行了计算，第一步现役桥梁的缺损状况可以通过查看《公路桥梁技术状况评定标准》得出，其次依据各测区回弹值从而求得了混凝土强度，通过规范对该箱型梁桥进行了材质状况评定。最后通过截面类型计算出了该配筋混凝土桥梁的承载能力，运用迈达斯软件建立模型，根据静载实验结果计算出该桥梁的理论承载能力，通过折损计算该现役桥梁的承载能力与理论承载能力作比较，推算出该现役桥梁承载能力是否满足公路Ⅱ级要求。关键词：箱型桥、混凝土强度、病害分析、恶化系数、折减系数AbstractIn recent years,there have been more and more overloaded vehicles,and the more serious the original,theoverload of vehicles can cause many adverse effects on roads and bridges.Because overload can lead to bridgecracks becoming bigger and bigger.Over a long period oftime,the bearing capacity ofbridge will be reducedbecause of cumulative damage,and the nommal service life ofbridge will be reduced so that the service life ofbridge can not reach the service life,so traffic may be caused greatly.Therefore,it is necessary to conduct acheck on the bearing capacity ofthe bridge.Through consulting relevant literature,this paper calculates the bearing capacity of theexisting 30-meter-"Evaluation Criteriafor Technical Conditions of Highway Bridges",then calculates the concrete strengthaccording to the rebound value ofeach measuring area,and evaluates the material condition ofthe box girderbridge by the criteria.At last,the bearing capacity ofthe reinforced concrete bridge is calculated by section type,the model is established by Midas software,the theoretical bearing capacity ofthe bridge is calculated by staticload test results,and the bearing capacity ofthe existing bridge is calculated by comparing the theoreticalbearing capacity with the theoretical bearing capacity through damage calculation,and whether the bearingcapacity ofthe existing bridge meets the requirements of grade II highway is calculated.Key words:Box Bridge,Concrete Strength,Disease Analysis,Deterioration Coefficientand Reduction Coefficient