Safety Analysis Of Large Slope Elevated Railw Ay Line Under Braking Force

Urban railway is a new and convenient rail transportation method.Mainly serve the suburbs and cities,between cities and towns.Used to ease the traffic situation in the increasingly heavy urban center.The speed of urban railways is between high-speed railways and ordinary railways.The site has a low density and the lines are mainly laid on the ground.The capital investment is much smaller than the construction of high-speed railway,and the economy is better.Urban railways are built and used more in developed countries.The development of urban railways in my country is slightly lagging behind,but it has also been constructed and applied in first-tier cities such as Guangzhou.Braking force is the main factor for the safe construction of large-slope urban railways,and it is also the embodiment of the economical construction of urban railways.Therefore,the safety of large-slope elevated railway lines under braking force is analyzed.The safety of the bridge,support and pier column under the action of the downhill braking force of the large-slope bridge is determined,respectively,to determine the maximum speed that the railway can reach under a certain slope;the maximum speed that can be reached under a certain slope.Provide suggestions for municipal railway construction.Mainly did the following research work:(1)According to the《City Railway Design Code》,refer to the high-speed railway design.Determine the three-dimensional model of the sloped beam,and use the finite element analysis method to analyze the force and safety analysis of the simply supported box beams with different slopes under the action of the downhill braking force generated by a certain speed;the downhill system generated by a certain slope and different speeds Force and safety analysis under dynamic action.It is concluded that the downslope braking force change caused by the braking force and the slope change has no obvious influence on the force and deformation of the simply supported box beam.The maximum slope,maximum speed and limit value of urban railways can be determined without considering the safety of simply supported box girder.(2)According to the size of the vertical load transmitted from the upper structure,the specification of the plate rubber bearing is selected.The finite element analysis method is used to analyze the force and deformation of the plate rubber bearing under the action of the downhill braking force generated by the bridge with different slopes at a certain speed;the plate rubber bearing under the action of the downhill braking force generated by the certain slope and different speed Force and deformation analysis.It is concluded that the force and safety of the plate rubber bearing can be satisfied under the action of the downhill braking force generated by the speed of 200km/h at a slope of 30‰.At a speed of 160km/h,under the action of the downhill braking force generated by a gradient of 40‰,the force and safety performance of the plate rubber bearing are satisfied.Under the action of the downhill braking force generated by a slope of 50‰,the force and deformation performance of the plate rubber bearing cannot be satisfied.Therefore,when considering the safety of the plate rubber bearing,when the bridge gradient is 30 ‰,the speed can reach 200km/h;when the train speed is160km/h,the bridge gradient can reach 40‰.(3)Check the data to determine the size of the high pier column.The finite element analysis method is used to analyze the force and deformation of the high pier column under the action of the downslope braking force generated by the different slope bridges at a certain speed;the force of the high pier column under the action of the downslope braking force generated by the certain slope and different speeds And deformation analysis.It is concluded that the force and safety of the high pier column can be satisfied under the action of the downhill braking force generated by the speed of 200km/h when the slope is 30‰.At a speed of 160km/h,under the action of the downhill braking force generated by a gradient of 40‰,the force and safety performance of the high pier column are satisfied.Under the action of the downslope braking force generated by the slope of 50 ‰,the force and deformation performance of high pier columns cannot be satisfied.Therefore,when considering the safety of high piers,when the bridge gradient is 30‰,the speed can reach 200km/h;when the train speed is 160km/h,the bridge gradient can reach 40‰.