The Research Of Wind Characteristic Parameters And Flutter Instability Of Suspension Bridges With A Steel Truss Stiffened Girder In Mountainous Regions

Wind-resistance of bridges in mountainous area is a difficulty in the wind engineering realm. The research on this area is deficient at home and abroad, so the relative literatures and the first hand meteorological data around the bridge sites are lack. The purpose of this paper is to solve the present problems in mountainous area which are weak in the wind-resistance code of bridges. Both the surrounding terrain around Beipan river Bridge sited in Guizhou Province and the Sidu river Bridge sited in Hubei Province are chosen for research, the wind tunnel tests of large domain terrain simulation are carried out to investigate the distribution of the wind field in mountainous area. As a result, the design wind speed of bridges located in mountainous area is reasonably deduced. On the basis of Beipan river Bridge, which is a suspension bridge with the truss stiffened girder, the wind-resistance performance of this kind of bridge is carried out by means of wind tunnel tests and numerical analysis. The progress of the dissertation in theory and method is expressed mainly as following aspects:(1) The distribution of wind characteristics is partially obtained through wind tunnel tests for some typical terrain around bridges sited in the mountainous area.(2) Depending on experimental results, a method to determine the design wind speed of bridges in mountainous area is put forward through statistically analyzing the meteorological data of the meteorological station nearby.(3) Numerical simulation of the wind characteristics in the large domain mountainous area is put into practice based on CFD.(4) The wind tunnel tests of full scale aeroelastic model of suspension bridge with...