Study On Energy Dissipation Capacity Of Modified Bitumen Sliding Pad And Its Application In Earthquake Resistance Of Stairs

Sliding bearing is a new type of bearing that it separated the ladder plate and the ladder beam by a superposition method on the structure When it was applied to the stairs,so it becomes Sliding stairs and improves the seismic performance of the staircase?There are some problems that it appears the staircase plate violent beating,impacting with the ladder beam,excessive horizontal sliding displacement and the ladder plate falling due to violent beating in the strong earthquakes?It is of practical significance to improve the design of sliding bearings?In this paper,it improved on the shortcomings of ordinary sliding stairs,the Teflon plate is replaced modified asphalt material and embedded a certain amount of vertical reinforcement?So,this paper designed 15 new sliding bearings and studied the influence of the thickness of material,the number of bars and the type of reinforcement on the seismic performance of sliding bearing are studied by Low Reversed Cyclic Loading,Combining with SAP2000 finite element software studied the influence of traditional stairs,ordinary sliding stairs and new sliding stairs on the seismic performance of the whole structure?The experimental results show that the new sliding bearing has good energy dissipation capacity and sliding deformation capacity,the equivalent viscous damping coefficient of each bearing is between 0.21 and 0.36,inserting the vertical reinforcement can obviously improves the vertical shear force;the energy dissipation capacity and the horizontal shear strength can be improved by do the initial deflection for the vertical reinforcement;in order to preventing the concrete was cracked,it was recommended to Increase the thickness of the protective layer?Using the sliding stairs can changed the whole structure's vibration mode,reduced force of Stair components and change the yield mechanism of the whole structure,However,there is little difference between the ordinary sliding stairs and the new sliding stairs for the Whole structure,It is suggested that the number of reinforcement should not be less than 10 in high seismic fortification zone,the energy consumption of the new sliding bearing has little influence on the energy input,It is suggested that the number of reinforcement should not be less than 10 in high seismic fortification zone?...