Experimental Study And Finite Element Analysis Of Horizontal Deformation And Rotation Capacity Out-of-plane For New Pin Shaft Bearing

In recent years, pin shaft bearings are widely used in connection of roof and substructure, column footing, column base and support in large span space structures like airport terminal and gymnasium etc for its beauty, free rotation in-plane, easy of application and so on. But the common pin shaft bearings’ stiffness out-of-plane is too big, so that it can’t rotate, then under the load of uncertainty direction, like temperature load, earthquake action and so on, it’s easy to produce safe hidden trouble. To improve the deformation and rotation capacity out-of-plane of the common pin shaft bearing and solve the problem of poor ability to resist impact load, temperature and multidirectional seismic action, this paper joined the laminated rubber plate mat between the up and down ear plate of the common pin shaft bearing, forming a new type of Pin shaft bearing combined with the advantages of two materials of steel and high damping rubber creatively based on the engineering design idea “resistance combined with reduction” and “tamper force with mercy”, take the advantage of the characteristics of the super elasticity and high damping rubber to improve the deformation and rotation capacity out-of-plane of the common pin shaft bearing. This paper will compare and analyze the vertical deformation, horizontal distortion out-of-plane, rotation and corresponding mechanical performance, stress state and damage form by theoretical analysis, experimental research and finite element analysis, to provide the basis for the practical application and research.In this paper, we make the following work:1. To the vertical deformation capacity of the new pin shaft bearing, we will do the theoretical calculation of the vertical stiffness and deformation of elastic stage, vertical stiffness test of elastic stage and Abaqus finite element analysis of elastic-plastic stage. Using the Matlab software fitting the date of test and simulation, to get the vertical stiffness and deformation of elastic stage of the new pin shaft bearing, and according to the stress distribution and stress-load curve of the finite element analysis to analysis the vertical deformation, stress distribution and damage form of the whole elastic-plastic stage of the new type pin shaft bearing. The results show that joining the laminated rubber plate mat between the up and down ear plate of the common pin shaft bearing, the length of the pin increased, then increase the chances of the pin shaft bending failure, to some extent, improved the deformation capacity and ductility under the action of vertical force deformation capacity and ductility, at the same time, vertical stiffness and displacement under the design bearing capacity can meet the specification requirements for general support.2. To the horizontal deformation capacity out-of-plane of the new pin shaft bearing, we will do the theoretical calculation of the horizontal stiffness and deformation of elastic stage, vertical stiffness test of elastic stage and Abaqus finite element analysis of elastic-plastic stage. Using the Matlab software fitting the date of test and simulation, to get the horizontal stiffness and deformation out-of-plane of elastic stage of the new pin shaft bearing, and according to the stress distribution and stress-load curve of the finite element analysis to analysis the horizontal deformation, stress distribution and damage form of the whole elastic-plastic stage of the new type pin shaft bearing. Results it is concluded that the horizontal deformation out-of-plane of the new pin bearing is mainly accomplished by compressive deformation of the laminated rubber pad, increased the horizontal deformation capacity out-of-plane of the the common pin shaft bearing.3. To the rotation capacity out-of-plane of the new pin shaft bearing, we will do the vertical stiffness test of elastic stage and Abaqus finite element analysis of elastic-plastic stage to get rotation out-of-plane of elastic stage of the new pin shaft bearing, and according to the stress distribution and stress- rotation curve of the finite element analysis to analysis the rotation capacity, stress distribution and damage form of the whole elastic-plastic stage of the new type pin shaft bearing. Results it is concluded that due to the compression deformation of the laminated rubber pad,the new pin shaft bearing have some rotation ability out-of-plane, and has certain safety reserve, can effectively release the negative bending moment out-of-plane.