中国铁道科学2017，Vol.38Issue(2)：42-48,7.DOI:10.3969/j.issn.1001-4632.2017.02.07
重载铁路桥梁动力响应的随机性分析及最大值估计
Randomness Analysis and Maximum Estimation for Dynamic Response of Heavy Haul Railway Bridge
摘要
Abstract
In order to evaluate the feasibility for heavy axle load trains passing through existing bridges,the randomness of bridge dynamic response was analyzed under different speeds and different axle loads of trains based on the field test data of a heavy haul railway bridge.Meanwhile,the maximum value of dynamic response was estimated combined with the triple standard difference method.Results show that train speed has little effect on the vertical deflection and lateral amplitude of the bridge within the speed range of 60 to 80 km · h-1.As the train speed increases,the vertical amplitude of bridge increases slowly,meanwhile,the transverse and vertical vibration frequency of midspan together with the vibration acceleration of bridge are gradually increased.As the axle load of freight train increases,the vertical deflection of bridge almost increases linearly.Both the amplitude and vibration acceleration have an increasing trend at the same time.The probability density discrete degree of bridge dynamic response caused by in service train with the axle load of 25 t is higher than that caused by test train.At the same speed,the transverse response of midspan has higher randomness than vertical response.The randomness of amplitude is equal to that of vibration acceleration.The randomness of vertical deflection is the lowest.For a 2-24 m low height prestressed concrete simply-supported T beam bridge,the maximum value estimation indicates that trains with 30 t axle load can pass through the bridge when the speed is below 75 km · h-1.关键词
桥梁/轴重/动力响应/随机性/最大值估计/重载铁路Key words
Bridge/Axle load/Dynamic response/Randomness/Maximum estimation/Heavy haul railway分类
交通工程引用本文复制引用
谈遂,余志武,金城,毛建锋..重载铁路桥梁动力响应的随机性分析及最大值估计[J].中国铁道科学,2017,38(2):42-48,7.基金项目
国家自然科学基金资助项目(51278496,51578549,U1434204) （51278496,51578549,U1434204）
国家科技支撑计划项目(2013BAG20B00) （2013BAG20B00）
中国铁路总公司科技研究开发计划项目(SY2016G001) （SY2016G001）
中南大学中央高校基本科研业务费专项资金资助项目(2012zzts020) （2012zzts020）
湖南省研究生科研创新项目(CX2011B094) （CX2011B094）
