In order to evaluate the safety and applicability of common span simply box girders in service of passenger dedicated lines under normal operating conditions,a passenger dedicated line that has been in operation for 14 years is taken as the research object,and 2-hole 23.5 m span and 4-hole 31.5 m span simply box girders are selected.Based on the field test method,the research on the inspection and evaluation technology of bridge operation performance under the action of normal operation train is carried out.The results show that under the action of EMUs with a speed of 250 km/h and below,the transverse amplitude,transverse acceleration,vertical amplitude and vertical acceleration of the simply box girders with spans of 23.5 m and 31.5 m in service are consistent in the vibration modes of different parts of the box girder.The transverse amplitude of the mid-span at the top of the box girder is basically the same as that at the bottom plate of the beam.And the vertical amplitude is slightly larger and the vertical acceleration is larger.The transverse amplitude and vertical amplitude of the 31.5m span simply box girders are greater than those of the 23.5m span simply box girders,and the vertical acceleration is less than that of the 23.5m span simply box girders.However,all the operating performance parameters meet the relevant requirements of the"Regulations on the Operation Performance Verification of High-speed Railway Bridges(Trial)".
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万方数据
