Research On Shock Absorption Technology Of The Long-span And Long Connected Continuous Beam Bridges With Short Pier And Long Pile

Based on the summary of the earthquake damage of continuous beams,this paper briefly describes the current research status of continuous beam bridge damping technology.And choose the main bridge part of the Baoshu Yellow River Bridge as the object of study in this paper.The bridge has the characteristics of dwarf,long pile,large span,long union,and the base lique faction of the field area where the bridge is located.In this paper,the main bridge of the bridge is modeled in finite elements,and a dynamic calculation model is established according to different basic simulation methods.The power characteristic analysis,dynamic reaction spectrum analysis and dynamic time range analysis are carried out on the bridge,and the damper parameters and arrangement scheme are studied.The main contents of the text are:1,consider the interaction of pile one earth and one structure,The finite element model is established using two modes,such as linear spring and three-dimensional beam unit,to simulate the pile base.To investigate the effects of different base stiffness and the dynamic characteristics of the pile on seismic reaction.2,General analysis and research of different piles under the free length of the base,dwarf and the basis of internal force severance of the law.3,Combined with the structural characteristics of this bridge,The value of the damping coefficient c and velocity index a in the nonlinear time range of the bridge and the laying scheme of the damper are studied.Through the analysis and study of the above contents,the main conclusions are:1,Linear spring and three-dimensional beam unit and other generation simulation pile base two modes to establish finite element model on the power characteristics of the bridge has a basic impact.But the generation method of three-dimensional beam unit can reflect the internal strength of a single pile.2,For the tall and shorter bridge,due to the overall stiffness of the bridge,As the free length of the pile base increases,the bridge begins to soften and the self-vibration cycle begins to grow.For such bridges,the analysis and study yielded a suitable damping coefficient C and speed index,and obtained a better damping device arrangement scheme.3,For such bridges,the analysis and research to obtain a suitable damping coefficient c and speed index,and obtained a more.Excellent damper arrangement.