On Security Of The Span Steel Truss Arch Bridge

A steel truss arch bridge, Nanjing Dashengguan Bridge in Jinghu Express Railway, lies in Nanjing, Jiangsu Province. The bridge site areas locate in upstream areas of Nanjing Changjiang Bridge and the Third Nanjing Changjiang Bridge.1.5Km away from the latter bridge, Dashengguan Bridge is one of the important components of Jinghu Express Railway.Because the span of Nanjing Dashengguan Bridge is long, the bridge deck is high above the horizontal plane, and it is in the areas of great wind force, the impact of the natural wind toward the security of the vehicles operation on the express railway and subway is one of the problems need to study. Setting up wind structure to cut down the wind load of the vehicles and improving the wind speed limitation of safe opereation of the train are of great meaning. But, the type of wind structure, its impact to wind resistance of the main bridge structure, and wind resistance effect of the vehicles, etc. need professional research to make sure.Therefore, toward the operation and security of the main bridge, Nanjing Dashengguan Bridge is of great significance to study the wind parameter of the bridge and vehicles, wind load parameter wind tunnle model experiment, wind structure measures, the impact of strong wind to catenary rail line, and wind-vehicle-bridge coupling vibration analysis, and to research the wind speed-vehicle speed relationship curve to make sure the security and stability of the train operation, to introduce wind structure measures, predicting wind speed and sealing wind speed of the train safe operation,This paper does the following work:â‘ without cross wind, metro single-lane, metro and the neighbour train ICE3 and CRH2 into the bridge at different time in a two-way traffic, evaluating the dynamic performance of the bridge and subway vehicles;â‘¡under cross wind, metro single-lane(windward side, leeward side), metro(windward side) and the dynamic performance of the bridge without windshield, with a 2.0m high and rate through the air 30% wind shield, and a 2.5m high and rate through the air 30% windshield respectively and vehicles.