摘要研究目的：采用车- 桥系统相互作用的计算模型, 对铁路双线连续梁桥竖向有载自振频率进行了理论推导, 并计算了两列20辆相同参数的提速客车从桥梁的两端同时通过40 m + 4 x 72 m + 40 m 部分预应力混凝土连续箱形梁桥时, 车- 桥系统的竖向有载自振频率。为进一步研究多线铁路桥梁竖向有载自振频率和振动响应等提供参考。
Abstract：Research purposes: The vert ical load - carry ing frequency of ra ilw ay doub le- track con tinuous bridge is derived in theory w ith the mode l for calcu lation of the interaction of vehicle- bridge system, and the vertica l loadcarrying frequencies of the veh icle- bridge system is calcu lated when tw o speed- ra ise passenger tra ins respectively composed o f tw enty coaches w ith the sam e cond itions passing through some parts of pre- stressed concrete continuous box- g irder bridge at 40m + 4 x 72 m+ 40 m from both ends of the bridge for the purpose o f prov id ing the reference to study ing the vertical load- carrying frequency and vibration response o fmult ip le- track railw ay bridge .
Research conclusions: The change regularity o f the vertica l load - carry ing natura l frequency o f th is double- track continuous bridge w ith tw o tra ins on it is sim ilar to that o f sing le- track simp ly- supported bridge and that of th is bridge w ith one tra in on i.t The vertica l load - carry ing frequency of this bridge can be rep laced by its na tura l frequency,w ithout obv ious error. If the vert ica l load- carry ing frequency should be calcu lated, it can be rep laced by the average value.
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2011, Vol. 28 
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