【摘要】 在高速铁路桥梁设计实践中,实际设计的高速铁路桥梁在ZK静活载作用下的竖向挠度均远小于《高速铁路设计规范》表7.3.2中的限值。控制高速铁路桥梁设计的为基频、梁端转角和残余徐变变形等其他限值指标,《高速铁路设计规范》中的竖向挠度限值只有象征意义,并不控制设计。通过梁端转角与挠跨比的相关关系入手,采用车-桥耦合动力仿真分析方法,对高速铁路常用跨度桥梁的挠跨比进行分析研究,并结合工程实践,提出挠跨比建议值,研究成果为铁路桥梁设计规范的修订提供参考。更多还原

【Abstract】 In terms of the design practices of high speed railway(HSR) bridges, the vertical ratio of deflection to span of practical HSR bridges under the action of ZK static live load is far less than the limit specified in TB10621—2014 High Speed Railway Design Code(hereinafter referred to as HSR Code). It is fundamental frequency, rotation angle at beam end and deformation of residual creep that control the design of HSR bridges, and vertical deflection limit has merely symbolic meaning. Starting with the correlativity of rotation angle at beam end and the ratio of deflection to span and adopting the analytical method of train-bridge coupled dynamic simulation, the paper carries out an analysis of the ratio of deflection to span of HSR bridges and puts forward the suggestive value of the ratio based on engineering practices. The research results will provide references for future amendment of the design code of railway bridges.更多还原