摘要
对提速线路上5座不同跨度横向振幅严重超限的单线钢桁梁的车桥耦合振动进行分析,提出通过加强下弦杆和上、下平纵联斜杆的加固方案,并据此实施加固。桁梁加固前后理论计算和动力测试结果的分析与比较表明,加固后的桁梁自振频率得到明显提高,跨中横向振幅大幅降低,各项动力特性指标均已满足《铁路桥梁检定规范》所规定的允许值,列车的脱轨系数Q/P和轮重减载率ΔP/P也小于《铁道车辆动力学性能评定和试验鉴定规范》(GB5599—85)所规定的限值,加固后各孔桁梁的横向刚度和动力特性已满足货车80 km.h-1、客车160 km.h-1的安全运行要求,且加固费用大幅度降低。
The techniques to enhance the lateral stiffness of the steel truss bridge on existing railway are introduced in this paper. By analyzing the coupled vibration of train-bridge with out-of-gauge lateral vibration amplitudes for 5 bridges with different spans, the reinforcement scheme for these bridges is proposed and implemented. The results of theory computation and the dynamic test of these bridges before and after the reinforcement are analyzed and compared, and the effect of reinforcement is checked. The investigation indicates that by strengthening the bottom chord bar and bevel bar of top and bottom longitudinal connection structures in the 5spans truss bridge, the natural frequencies rise obviously and the lateral amplitudes at the middle point of span decrease greatly, and all the dynamic properties are within the range of the values regulated in “Code for Rating Existing Railway Bridge” （2004 edition）, the bridge derailment quotient Q/P and the reduction rate of the wheel load △P/P are within the range of the values regulated in “Code on Dynamic Properties Evaluation and Experimental Determination for Railway Vehicles” （GB5599-85）. After the reinforcement, the lateral stiffness and dynamic properties of each span of the truss bridge meet the requirements of safety service for freight train at the speed of 80 km·h^- 1 and for passenger train at the speed of 160 km·h^-1 . Therefore, the benefit of technique and economy is obvious.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2005年第5期12-16,共5页
China Railway Science
基金
铁道部科技研究开发计划项目(2000G14-A)
关键词
既有线
钢桁梁桥
横向刚度
加固技术
Existing railway
Steel truss bridge
Lateral stiffness
Reinforcement technique
作者简介
顾建新（1953-）,男,江苏启东人,高级工程师.
