Study On Seismic Behavior Of Tensile And Anti-wind Cable Rubber Isolation Bearings

In order to solve the two major problems of isolation bearing which are difficult to have both wind isolation function and easy to exceed the standard of tension stress in high wind pressure area and high seismic intensity area,a series of research work has been carried out in this paper with using the simple structure,direct transmission of force and clear energy dissipation mechanism of the isolation bearing as the foundation object.Some reference opinions on the above two major problems are put forward for the design and application of isolation engineering.The main research results are as follows:1.The finite element analysis of the energy dissipation performance,the influence degree of structural parameters and the overall performance of isolation bearings are carried out for 9TRC models and 13 WRC models.The analysis results show that when TRC is in tension,the fixed angle of the two-way double oblique tension device is suggested to be arranged at about10 degrees ?the size design of the connecting plate is suggested to be based on the actual stress state and the horizontal length of gray cast iron in WRC wind-resistant device is suggested to be designed to be about 100 mm.And when the stiffness of the connecting plate of the isolation bearing is allowed,the minimum cross-section diameter of gray cast iron is suggested to be appropriately increased?the fixed angle of the two-way double oblique wind-resistant device is suggested to be arranged in the range of 11 degrees and the thickness of the connecting plate is suggested to be increased as much as possible in the design.2.The pseudo-static loading tests are carried out on LNB400 and TRC400 specimensdesigned and manufactured.The analysis results show that:(1)The number of locks has a significant effect on TRC performance;(2)The hysteresis curve of TRC specimens is full and has good energy dissipation capacity;(3)The error between finite element simulation and experiment which is within the allowable range is 16.3%.Therefore,the constitutive relation and modeling method used in this paper are feasible.3.The ETABS is carried out to analyze the non-linear time history of a 26-storey double-tower base isolation structure with large chassis?pulsating wind loads obtained by MATLAB programming language are applied to simplified particles of each floor of the project as wind-induced excitation to verify the working mechanism of wind-resistant cable isolation bearings and Hook element is proposed to simulate the tension and wind resistance characteristics and calculate the axial stiffness of tension and wind resistance cables.The analysis results show that :(1)The horizontal stiffness of wind-resistant cable isolation bearings can increase under wind load,but decrease under earthquake,without affecting the isolation effect of the isolation structure as a whole;(2)The tension device can ensure that the isolation bearing can achieve the tensile strength of the isolation bearing within 1 Mpa required by the code without affecting the setting target of the isolation effect,and strictly control the maximum horizontal shear displacement of the isolation bearing within 330mm;(3)The tension and wind-resistant cable isolation bearing can not only satisfy the bearing’s axial stress,wind-resistant check and displacement check,but also significantly improve the economic benefits of the project.