Experimental Research And Fem Analysis Of Clapboard-type Lead Damper

Because energy damping technology has Specific damping mechanism, a significant damping effect, a simple configuration and a wide scope, so it is increasingly attracting attention. on its research and engineering applications continues to grow. Lead damper bases on plastic energy absorption of lead metal. It is a simple structure, excellent performance and economical energy damping control device.Initially, a clapboard-type lead damper(CLD) was presented in this paper, and four damper specimens with different constraint forms were designed according to its structure and energy principle. The low frequency cyclic tests were conducted by EHF-EM. The influence of four constraint forms on mechanical properties and energy dissipation performance of CLD were analyzed to reveal the energy dissipation mechanism. The results show that: CLD are mainly characterized by small yield displacement, low cost, simple structure, stable working performance and excellent dissipation characteristics, so they are getting widely used in the field of building structure and large mechanical vibration control; the comparison shows that the B-type damper has particularly superior mechanical properties and better energy dissipation capacity, especially enhances stiffness with the increase of displacement, and also has a restrict capability on structural vibration displacement.Furthermore, based on CLD’s structural characteristics and energy principle, ANSYS software is used on the building of finite element model and numerical simulation analysis for the common CLD-type A damper. From its hysteresis curve, dampers hysteretic behavior and energy dissipation capacity is analyzed. Comparison of experimental results concluded that, the finite element model factually simulate actual working conditions, with good applicability.Additionally, on the research above a multiple linear regression analysis was made with the length, height and width(thickness) of lead bodies as the independent variables, multi-linear yield load, bilinear yield load, pre-yield stiffness and post-yield stiffness as the dependent variables. Then bilinear restoring force model had been described and verified that it had good applicability by comparison.Finally, the high-rise structure with optimization setting of type A damper conducted vibration reduction analysis. The third stage 20 layers nonlinear steel frame seismic structures of Benchmark was used for the structure model. Seismic waves selected San Fernando wave and El Centro wave and an artificial wave AW918. San Fernando wave and El Centro wave are natural seismic waves. In the case of multiple, rare earthquake, the largest inter-layer displacement angle, top displacement and type A damper’s performance were analyzed by comparison of the structure corresponding for three group ones-uncontrol structure, bilinear control structure and multi-linear control structure. The results showed that by installing type A damper, inter-layer displacement angles and top layer displacement of the structure significantly lessen compared with original structure, and the damping effect is obvious.