Study On Aerodynamic Parameters And Wind-resistant Performance Of Pipeline Suspension Bridge

Compared with highway suspension bridge,pipeline suspension bridge has obvious narrow and soft characteristics and is very sensitive to wind load.But at present,the relevant code of wind resistant design of pipeline suspension bridge are not perfect,and wind resistant design has become a bottleneck problem of long span pipeline suspension bridge.To form a wind resistant design method which can be applied to engineering practice,it is urgent to study the wind resistant design and test method of pipeline suspension bridge.This paper has done the following research work on these problems:1.The uniform parallel ribs is set on the pipe surface of the pipeline bridge model to reduce the Reynolds number effect of the model wind tunnel test.The wind tunnel test of single pipe and single layer pipe bridge model with and without rough element is carried out,and the improvement effect of setting rough element is analyzed from the angle of resistance coefficient.On this basis,the wind tunnel test of typical suspension bridge segment model is carried out,and the variation law of the pipe bridge aerodynamic parameters is analyzed.Study on the influence of the width of the bridge and the diameter of pipe on static coefficient and flutter derivatives.2.The turbulent wind field in the pipeline bridge is simulated in the wind tunnel test room by using spires and roughness elements.According to the structure of the pipeline suspension bridge,the double balance pipe bridge model synchronous force measuring device is developed.The dynamic balance and the crossbeam of the stationary support are set inside the pipe of the model,so that the influence of the cross beam on the flow field around the model is avoided.The time history of buffeting force and power spectrum are obtained in the simulated turbulent wind field.3.According to the characteristics of the turbulent wind field and the buffeting force of the pipeline bridge,the spanwise correlation between the turbulent wind field and the typical pipe section is analyzed.The empirical formula of aerodynamic cross coherence function of pipeline bridge section is established.4.The buffeting force spectrum of truss section of pipeline bridge is converted into slice spectrum.And the equivalent aerodynamic admittance of pipeline bridge section is obtained.5.The static stability of suspension bridge is studied by finite element model,and the influence of wind resistance cable and span is analyzed.The limit span of the suspension pipe bridge based on the lateral displacement limit is obtained.