Research On The Application Of Buckling Restrained Brace In The Energy Dissipation Of High-Speed Railway Station

Large span space public buildings often have important political,economic and social functions.In the event of earthquake and other disasters,long-span space public buildings are often used as temporary resettlement and emergency places for the affected people,so it is of great significance to control the vibration reduction of highspeed railway station structure.In this paper,based on the research background of a station bridge integrated high speed railway station structure,the finite element simulation method is mainly used to study the vibration reduction of the high-speed railway station structure with buckling restraint brace and without buckling restraint brace.The main work of this paper is summarized as follows.(1)The layout and parameters of buckling restrained brace are determined.By using the finite element analysis software,the elastic seismic analysis of the damping structure and the original structure is carried out,including modal analysis,response spectrum analysis and elastic time history analysis.By comparing the seismic performance parameters before and after the shock absorption,the seismic effect of the buckling restrained brace on the high-speed railway station structure under frequent earthquake is explored.The results show that the buckling restrained braces do not yield or start to dissipate the energy of the seismic input structure under frequent earthquake.They only provide the lateral stiffness of the structure and reduce the seismic response of the structure,especially the displacement response of the structure.(2)By using the finite element analysis software,the elastic-plastic time history analysis is carried out for the shock absorption structure with buckling restrained brace and the original structure.By comparing the seismic performance parameters before and after the shock absorption,the shock absorption effect of buckling restrained brace on the high-speed railway station structure under rare earthquake is explored.The results show that the buckling restrained brace has begun to yield and dissipate energy under the rare earthquake action,which can effectively dissipate the energy input to the structure.The hysteretic curve of the buckling restrained brace is full,which can effectively reduce the seismic response of the structure.Buckling restrained brace becomes the first line of defense of the structure.It takes the lead in yielding and dissipating energy under the earthquake,reduces the damage and destruction of the structure,and effectively protects the main structure.(3)Using the finite element analysis software,the influence of different lateral stiffness ratio and different brace arrangement on the structural damping of high-speed railway station is studied.The results show that when the lateral stiffness ratio changes from small to large,the reduction amplitude and rate of the displacement response of the structure will gradually decrease,and the story shear force will gradually increase.Therefore,the recommended value range of lateral stiffness ratio is k = 0.5 ? 2.0.The results show that the V-type arrangement is better than the monoclinic arrangement in damping effect,has better displacement damping effect,can better protect the main structure,reduce the damage and destruction of the structure,so it is recommended to use the V-type arrangement.