小跨径低高度混凝土梁运营性能检验与评价

摘要

The low-depth, small-span reinforced concrete beam bridge is one of the usually types of bridge of the Shuo-Huang Railway. With this type of beam bridge taken into account, a typical bridge structure is chosen, the operational performance of which is tested by dynamic testing methods, with the horizontal amplitude of the mid-span vibration, the lateral acceleration, the vertical amplitude of vibration, the dynamic deflection, the dynamic stress, the frequencies of natural vibration and the corre- sponding lateral amplitude of vibration and the frequency of the lateral vibration of the pier tested. Upon the basis of the results of the tests,the operational performance of the concrete beam is evaluated. The results of the evaluation show that: all the main testing parameters,such as the lateral amplitude of vibration of the tested span, can meet the requirements of 《The Test Speci- fications for Railway Bridges 》 when the train runs on them with the present operational speed.%小跨径低高度钢筋混凝土梁是朔黄铁路中的一种常用桥梁类型,针对此种梁型,选择了一座具有代表性的桥梁结构,采用动力检测方法对桥跨结构跨中横向振幅、横向加速度、竖向振幅、动挠度、动应力、自振频率和相应桥墩横向振幅、横向自振频率等进行了测试,并根据测试结果对其运营性能进行了评价。评价结果表明：运营列车以现行速度通过时,试验桥跨横向振幅等主要测试参数基本满足《铁路桥梁检定规范》的要求。