摘要
由于桥梁徐变上拱,我国高速铁路连续多等跨简支梁出现了周期性高低不平顺问题.本文通过对简支梁徐变上拱成因及其引起的轨面高低不平顺变化规律分析,发现在开通运营后的前两年桥上高低不平顺幅值年均变化量较大,后期逐渐缩小;通过列车桥梁相互作用动力分析,得出高速列车在允许运营速度及其以下通过桥梁时,桥梁徐变上拱引起的周期性高低不平顺产生的列车动力响应均在安全标准范围以内.通过对沪宁高铁多跨简支梁桥轨面高低不平顺整治的效果来看,本文提出的桥上周期性高低不平顺整治措施能够可靠、有效地降低高低不平顺幅值,提高轨道平顺性,进一步保证旅客的舒适性.
Due to creep of simply-supported beam,periodic profile irregularity has appeared on the continuous multi-span simply supported beams on our high-speed railway.Through the analysis of the cause of the creep and of the variation of profile irregularity caused by the creep,the paper found annual variation of the amplitude of profile irregularity changed larger in the first two years since the operation of the train,and gradually reduced later.By train-bridge dynamic analysis,the dynamic response of trains traveling on the bridge with periodical profile irregularity were within the range of safety standards when high-speed trains operated below the allowable speed. Through the regulation effect of periodical profile irregularity on the sinply-supported bridges,the project proposed by the paper can reduce the amplitude of periodical profile irregularity reliably and effectively,and can be to further ensure passenger comfort.
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2014年第7期786-792,共7页
Scientia Sinica(Technologica)
基金
国家重点基础研究发展计划(批准号:2013CB036200
2013CB036205)资助项目
关键词
高速铁路
轨道不平顺
徐变
动力响应
整治措施
high-speed railway, track irregularity, creep, dynamic response, improvement methods
