Research And Experiment Of Lead Board Damper

At present, the research and application of energy isolation, shock absorption technology is more and more widely used. With the continuous development of society, more and more new equipments are developed and applied. Lead metal damper plays role in its key area gradually. It can consume earthquake energy when the earthquake happens because lead occurs elastic-plastic deformation to yield. So as to achieve the purpose of shock absorption and isolation. This paper briefly describes the research results of the lead damper in recent years, and presents a new-lead board damper. And study the lead board damper and related seismic theory. The specific researches are as following:(1) In this paper, we develop lead board damper based on structure of the passive control theory. It expounds the construction of the lead board damper and material composition. The paper systematic introduces lead board damper loading test’s test equipment, test purpose, loading scheme and test conditions. Then we can get test data from different amplitude, frequency and combination of specimen size. Due to this data we can calculate the damping ratio and equivalent stiffness under different amplitude, frequency and specimen size. Further analyses these different factors’ effect to lead board damper, and we can get its hysteresis curve model. The test result shows that the energy shock consumption style of lead board damper is change due to the change of internal lead board’s length. The lead board damper is shear energy consumption in certain length. The mainly energy consumption style turns to bending energy consumption when the length is beyond the standard. It has good energy consumption performance. It can reach satisfactory effect of under smaller deformation. Frequency and cycling times have little influence to its own energy consumption. Its installation and production is simple, and it can be adjusted easily.(2) According to the theoretical foundation of the finite element analysis, and adopting Large general finite element software-ANSYS. Analyses lead board damper and different length, height’s effect to the lead board damper. And compare to the test result. The finite element analysis result shows that the damping force reduced when the central board’s length increased. When the length increased the damping force also increased. The main stress point of the lead board damper is center wall of central lead board. Comparing hysteresis curves which get through the analysis of ANSYS and get from test. The results indicate that get hysteresis curve in test is slightly better in ANSYS analysis in the damping force in the same condition. This situation’s happen is because we don’t consider the friction of lead board wall and tappet in ANSYS analysis. Because the specimen can’t be perfect in the production process. So the full degree of hysteresis curve which is get from ANSYS analysis is better than the curve get from test. Although the result of ANSYS analysis is little different from the result from test. But parameters influences are same.(3) Finally, we carry nonlinear analysis to lead board damper in actual application of structure. Plan to build a house with5frame structure, adopting lead board damper strengthened. Comparative analysis structural corner’s displacement effect through ANSYS analysis. By summarizing and analyzing we know that addition of lead board damper can reduce almost50%angular point displacement in the same seismic wave. Further proving that the lead board damper is a kind of rational energy shock absorber.