Over a half mileage of high speed railway all over the world is built in china. The majority of high speed railway bridge employed simply-supported girders which were precast in factorys and erected in-site. T he study on long-span simply-supported girder was important for the development of China high speed railway bridge technique. In this paper,investigation and statistical analysis of high speed railway bridge design shows that the fundamental frequency limit was the most important design factor for the girder which span is within 32 m. W ith the increase of span,the angle limit is getting more important. Dynamic response is not significant through analysis of impact facotr of simply-supported girders with different fundamental frequency and under the action of high speed train. T he weight of 40 m girder may be controlled within 1 000 t,satisfying the current requirement of transportation and erection. Besides,it may bring huge economic benefits.%我国高速铁路运营里程已经占全球1/2 以上,预制架设的简支梁桥占我国高速铁路桥的绝大部分,研究预制架设大跨度简支梁对推动我国高速铁路桥梁技术进步十分必要.本文的研究及设计统计结果表明,对于高速铁路简支梁设计,跨度≤32 m 由基频限值控制,随着跨度增大,梁端转角限值的影响越来越大.分析不同基频的简支梁在运营列车作用下的动力系数发现,大跨简支梁车桥动力效应不明显.40 m简支梁试设计证明梁体质量可以控制在1 000 t以内,因此目前的运架设备通过改造可以满足其运输架设要求.此外,在一定条件下使用40 m简支梁将带来巨大的经济效益.
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