The Design Of New Zn-22Al Damper And Its Numerical Analysis Of Energy Consumption

Earthquake has brought numerous disasters to human with its huge destructiveness and unpredictability. Especially the building structures which go through the earthquake will be seriously damaged or even collapse, leading to casualties and property loss. Therefore, how to effectively reduce the seismic action in the short time and avoid the collapse of the structures becomes a key point to the structural design. Energy damping that setting shock absorber in structure solves this problem efficiently, and has been applied in many engineering practices. Based on the existing energy damping theory, this paper chooses Zn-22A1alloy as the material of energy dissipator, and researches it from the following aspects:(1) Conducting tensile and compression tests at three different rates on Zn-22Al alloy of three different pressure rates in the room temperature to obtain its performance parameters with each process at different tensile and compression rates. The test results show that Zn-22A1alloy at the rate of65%has good plastic property and lower flow stress and has no obvious tensile stiffness. Besides, the compression properties of Zn-22A1alloy at three different pressure rates are similar with their tensile properties. All these properties indicate that Zn-22A1alloy is a good choice to make dampers.(2) According to the results of tensile and compression tests, choosing Zn-22A1alloy at the rate of65%as production material. On the basis of former researches, this paper puts forward a double loop type of energy dissipator and a bending-shear type of energy dissipator which can use both bending and shear deformation for energy dissipation, then carries on the finite element analysis. The results show that the two kinds of energy dissipators are full of hysteretic curve and large initial stiffness. The plane form of bending-shear type is especially more rational and of higher energy performance.(3) Using the finite element software (ANSYS) to do stimulation analysis on20layers of steel frame structures subject to the earthquake with new Zn-22A1damper. The results show that under the circumstance of frequent and unprecedented earthquake, the seismic responses of those steel frame structures with dissipaters are greatly reduced, compared with the ones without Zn-22A1energy dissipator. Therefore, it can be concluded that new Zn-22A1alloy, namely the bending-shear type of energy dissipater, is a kind of dissipation device with strong energy consumption.(4) Taking the stimulation analysis on the damping performance of dampers under seven different kinds of layout options. The results show that the layer displacement angles of seven structures are significantly reduced; the energy dissipation effect of layers is better than that of interlayers; the energy dissipation effect of symmetrical layout is better than that of asymmetric one.