摘要
在高速铁路桥梁动力分析中，由于系列转向架的作用，使中等跨度预应力混凝土桥在车速１３０～１６０ｋｍ／ｈ左右时桥梁的冲击系数出现峰值。这个问题在国外高速铁路设计规范中未反映。本文根据竖向动力分析推导了出现峰值的原因，并与实测值对照。建议我国制订高速铁路桥梁设计标准时必须考虑局部板值影响。
In the high speed railway line,the dynamic coefficient(1+μ)vensus v curve for a middle span prestressd concrete bridge will approach to a critical value at the speed of 130-166 km/h,This dynamic response appers due to tlie resonance between the frequency of the bridge and the series loading of bogies,In this paper, the vertical dynamical analysis of the bridge structure is offered,the reason how to produce this dynamic response is explained,The theoretical analysis is good coinciding with the field testing data,It is suggested that this dynamic response be considered in the new specification for the bridge structure in the high speed railway line。
关键词
高速铁路
预应力混凝土
桥
rapid transit railways,prestressed concrete bridges,dynamic characteristics
