Study On Mechanical Properties Of Corrugated Web Damper And Its Application In Bridges

The seismic performance of the traditional structure is weak,and its seismic design method is restricted by the function and economy of the building.Passive energy dissipation technology can effectively reduce the structural vibration response by adjusting the dynamic characteristics of the structure itself,which is a practical seismic design method.Shear plate damper is a type of passive energy dissipation element,which mainly uses the plastic deformation capacity of steel to consume energy,simple structure,easy to draw materials and low cost,and is widely applied in practical engineering.But the shear plate dampers are prone to instability and deformation,and the bearing capacity will be greatly affected.Corrugated steel plate has large shear bearing capacity and large external stiffness.In recent years,it has been widely used in the main girder web of the superstructure of the bridge.Therefore,based on the original performance of shear plate damper and corrugated steel plate,a new shear plate damper,called corrugated plate damper,is proposed in this paper.In this paper,the influence of five geometric design parameters on the mechanical properties and hysteretic behavior of corrugated plate damper models is studied by means of ABAQUS elastoplastic analysis software simulation.A simplified bilinear model for corrugated plate dampers is proposed,and the damper is applied to the deck steel truss arch bridge to analyze the effect of seismic performance improvement.The main research contents are as follows:(1)In this paper,based on the test specimens of four corrugated steel web beams,a full scale model is established by the finite element software ABAQUS,and the finite element simulation analysis is carried out.The validity of the finite element model is verified by the comparison and analysis of the two aspects of the load displacement curve and the buckling failure form with the test results.(2)The finite element model of 25 corrugated plate dampers was established,and the static elastoplastic analysis was carried out under the action of monotone increasing load.By investigating the initial stiffness,yield bearing capacity,ultimate bearing capacity and ductility of corrugated plate dampers,the influence of five geometric design parameters on the mechanical properties of corrugated plate dampers is summarized.(3)Based on the analysis of the mechanical properties of corrugated plate dampers,a reasonable range of geometric design parameters and corresponding numerical models are selected respectively for the quasi-static elasto-plastic analysis under reciprocating loads.By comparing the hysteretic curve,the skeleton curve and the equivalent viscous damping coefficient,we can get the conclusions as follows:With the increase of the ripple angle from 25 to 45 degrees,the hysteresis performance of the corrugated plate damper tends to be stable.Slanting segment and the straight segment ratio should be set to 1,convenient production and stable hysteretic performance.The hysteretic performance of the corrugated web with a height to width ratio of 0.7 is slightly better than that of 1.Increasing the number of ripples and increasing the ratio of width to thickness can lead to the instability and failure of the damper,and the hysteresis performance is reduced.(4)Finally,the finite element model of the deck steel truss arch bridge is set up,and the dynamic time history analysis of the full bridge is carried out.By extracting the displacement time history curve,internal force time history curve and strain time history curve of the side pier bottom,arch foot and middle span,the seismic performance and the weak seismic location of the arch bridge are analyzed.The results show that the arch bridge enters the plastic deformation state at the bottom of the piers and arch feet under the action of the transverse bridge to the earthquake,which is a weak seismic area.Therefore,a reasonable size corrugated plate damper is chosen to be arranged at the piers of the arch bridge,and the effect of seismic performance improvement is analyzed.By comparing the internal force response and displacement response of the two kinds of arch bridge models,the seismic performance of the bridge with corrugated plate dampers has been obviously improved.Through the above research,it is concluded that the corrugated plate damper proposed in this paper has good hysteretic performance in the range of reasonable geometric design parameters,and it can effectively improve the seismic performance of the arch bridge when applied to the steel truss arch bridge structure.