双线预应力混凝土连续梁桥竖向有载自振频率研究  

Study on Vertical Load-carrying Natural Frequency of Railway Double-track Pre-stressed Concrete Continuous Bridge

作　　者：任剑莹[1] 李文平[1] 苏木标[1] 

机构地区：[1]石家庄铁道大学,石家庄050043

出　　处：《铁道工程学报》2011年第1期35-38,46,共5页Journal of Railway Engineering Society

基　　金：铁道部科技研究开发计划项目(2007G028)

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+4×72 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。研究结论:该桥双线满布车辆时,竖向有载自振频率的变化规律与单线简支梁桥以及该桥单线通过列车时的竖向有载自振频率的变化规律相似;该桥的竖向有载自振频率可以用相应的无载自振频率来代替,不会引起明显的误差;如果计算该桥的竖向有载自振频率,可取其平均值代替。Research purposes： The vertical load-carrying frequency of railway double-track continuous bridge is derived in theory with the model for calculation of the interaction of vehicle-bridge system,and the vertical load-carrying frequencies of the vehicle-bridge system is calculated when two speed-raise passenger trains respectively composed of twenty coaches with the same conditions passing through some parts of pre-stressed concrete continuous box-girder bridge at 40 m＋4×72 m＋40 m from both ends of the bridge for the purpose of providing the reference to studying the vertical load-carrying frequency and vibration response of multiple-track railway bridge.Research conclusions：The change regularity of the vertical load-carrying natural frequency of this double-track continuous bridge with two trains on it is similar to that of single-track simply-supported bridge and that of this bridge with one train on it.The vertical load-carrying frequency of this bridge can be replaced by its natural frequency,without obvious error.If the vertical load-carrying frequency should be calculated,it can be replaced by the average value.

关 键 词：双线桥 车-桥系统 竖向有载自振频率 预应力混凝土连续梁桥 

分 类 号：U448.217[建筑科学—桥梁与隧道工程]