铁道标准设计2024，Vol.68Issue(3)：123-132,10.DOI:10.13238/j.issn.1004-2954.202208160004
某在役重载铁路32m预应力混凝土T梁后装声屏障适应性分析
Adaptability Analysis of Noise Barrier for 32 m Prestressed Concrete T-beam of an In-service Heavy Haul Railway
摘要
Abstract
With the development of heavy-haul capacity expansion transportation of freight railways in China,noise pollution caused by large axle load and long marshalling tends to be increasingly serious and the rear noise barrier has become one of the main measures to reduce noise pollution.However,the original design of the in-service heavy haul railway bridge upgraded through capacity expansion does not consider the influence of the rear noise barrier on the bridge structure.The 32 m simply-supported T-beam(bridge-2059A)of existing railway bridge is studied.The method of numerical simulation combined with field measurement of bridge status analysis is adopted.Based on different load combinations,the adaptability analysis of the main girder,the position of the noise barrier and the bridge connection and the ballast tank after the T-beam is installed with the noise barrier is carried out,and the potential weak position of the flange plate and the noise barrier structure is analyzed.The results show that after the T beam is equipped with the noise barrier,the longitudinal strength of the main girder is controlled by the shear resistance at L/8～L/4 of the beam body,and the shear safety factor at L/8 of the beam body is 1.70,which is less than the standard value(1.80).The safety reserve of the connection between the noise barrier and the bridge is insufficient.Under the most unfavorable load combination,the reinforcement stress of the ballast retaining wall exceeds the allowable value by 1.25 times,and the crack width exceeds the allowable value by 0.54 mm.Under the most unfavorable load combination,the residual safety reserve of reinforcement stress is 23.2%,and the crack width is 0.07 mm smaller than the allowable value.Considering the three kinds of analysis,it is concluded that this type of T-beam should not be equipped with noise barrier.In the most unfavorable situation,the damage order of T-beam will be:embedded chemical anchor,ballast retaining wall,the junction of noise barrier column and horizontal bar,the height of ballast tank,and the root of flange plate.关键词
重载铁路/铁路桥梁/预应力混凝土/T梁/声屏障/实测修正/数值模拟/适应性Key words
heavy haul railway/railroad bridge/prestressed concrete/T-beam/noise barrier/measurements correction/numerical simulation/adaptability分类
交通工程引用本文复制引用
郑晓光,刘永前,陈树礼,李勇,许宏伟..某在役重载铁路32m预应力混凝土T梁后装声屏障适应性分析[J].铁道标准设计,2024,68(3):123-132,10.基金项目
河北省重点研发计划项目(20375410D,21375403D) （20375410D,21375403D）
河北省自然科学基金项目(E2020210017) （E2020210017）
石家庄铁道大学优秀青年科学基金项目(2018019) （2018019）
