既有铁路高低墩桥梁运营性能研究

铁路承担着重要的运输任务,铁路桥梁是线路安全运营的重要一环,随着铁路"扩能提速"战略的推进,给桥墩带来了许多不利的影响,如横向振幅过大、冲击振动加剧等,严重影响了铁路桥梁的安全运营性能。以朔黄铁路清水河特大桥为研究对象,通过运营性能试验,研究高墩桥梁和低墩桥梁在不同荷载类型和不同行车速度作用下的安全运营性能,得出两种桥墩类型桥梁在荷载和车速变化时的动力响应变化趋势;通过对高墩桥梁和低墩桥梁在相同荷载和车速作用下的运营性能试验,对比分析两种桥墩类型桥梁在相同荷载和车速下的动力响应。相关结论可为铁路高低桥墩的维护管理提供科学依据。

Study of the Operational Performance of Existing Railway Bridges with Tall and Low Piers

The railway undertaking important tasks of transportation,the railway bridge is an important link of the safe operation of the railway.With the duty-raising and accelerating strategies of the railway implemented,exerted onto the piers of railway bridges are a lot of adverse effects,such as the horizontal amplitude being too large,the impact-caused vibration being increased and so on,all of which greatly affect the safe operation of railway bridges.With the Qingshuihe Mega Bridge of the Shuo-Huang Railway as our research object,studied in the paper is the safe operation performance of both the tall pier and the low pier of the railway bridge under different loads and under the conditions of different running speeds through the operation performance tests,with the dynamic response trends of the two types of piers in load and speed changes obtained.Through the operational performance tests of railway bridges respectively with tall piers and low piers under the action of the same loads and running speed,the dynamic responses of the two types of piers are compared and analyzed,the corresponding conclusion of which may provide a scientific basis for the scientific maintenance and management of tall and low piers of the railway bridge.