土-钢组合铁路桥的动力响应

对长跨钢涵洞铁路桥进行实际动力响应研究。桥为土-钢组合结构,长11m。通过测量不同车速下桥的应变和位移,对桥进行试验,同时,对垂直道床振动以及制动力的影响也进行了测量。研究显示:车速对位移、推力和力矩的影响较大;所测的动态位移与推力比超出相应静态响应的20%,远大于桥设计规范所规定的值;力矩到1/4点时,动荷系数高达1·45,高于关键点的值。鉴于从强迫振动试验中测得了高的阻尼值,与普通桥相比这种桥的类型对共振并不敏感。

Dynamic Testing of a Soil-Steel Composite Railway Bridge

Actual dynamic response of a long-span corrugated steel culvert railway bridge is studied.The bridge,which is a type of soil-steel composite structures,has a span of 11 m.Tests were carried out by measuring strains and displacements during passages of a locomotive at different speeds.Vertical ballast accelerations as well as the effects of braking forces were also measured.The tests showed that the speed has a large influence on the displacements,thrusts and moments.The measured dynamic displacements and th...