| Nowadays,energy dissipation devices are widely used in structural design.Steel plate damper is widely used because of its good plastic energy dissipation,low price and easy installation.In this paper,a kind of corrugated steel plate damper is presented,which is composed of four corrugated plates welded to the upper and lower end plates,which is referred to as the corrugated steel plate damper.Quasi-static test and finite element analysis under cyclic loading for its hysteretic behavior.The main research contents and conclusions are as follows:(1)The stress-strain curves with nominal yield strength of 235 MPa and nominal yield strength of 160 MPa steel plate were obtained by uniaxial tensile test of standard specimen made from damper base metal.The elastic modulus,elongation and actual yield strength of the two kinds of steel can be obtained by processing the data,and the nominal stress-strain obtained from uniaxial tensile test can be processed to obtain the true stress-strain of the material.Lay the foundation for the subsequent numerical simulation analysis.(2)Four damper specimens were designed for the mechanical properties and the quasi-static test was carried out.The test results show that.The results show that the hysteretic curves of four specimens are fuller and the displacement ductility coefficient is more than 3.The energy dissipation capacity of horizontal corrugated steel plate damper is better than that of vertical corrugated steel plate damper.The vertical corrugated steel plate damper has better bearing capacity than the horizontal corrugated steel plate damper,and the stiffness degradation speed of the vertical corrugated steel plate damper is a little faster than that of the horizontal corrugated steel plate damper.There is no tearing phenomenon in the whole loading process,so the carbon dioxide shielded welding used in this paper can ensure the integrity of the whole structure of damper.(3)The corresponding finite element models of four test specimens are established and analyzed.The results of finite element analysis show that the hybrid strengthening model can be used as a numerical model of corrugated steel plate dampers.Both the stress and deformation of the model and the strain development law of every point in the model are in good agreement with the experimental results,which indicates that the finite element analysis has a certain reliability.(4)After verifying that the finite element analysis is in good agreement with the test,it can be concluded that for the horizontal corrugated steel plate damper,the lager the wave angle,the better the energy dissipation.When the angle is increased,the speed of energy consumption is continuously reduced,the web spacing should be between100 mm and 250 mm,the aspect ratio should be set to 1.1,and the thickness should be6 mm.For the vertical wave plate damper,the wave angle has a low influence on the mechanical properties.In the subsequent design,the 45°in this paper can be used.The vertical wave outside the stiffness is large,only when the smaller aspect ratio is changed,the overall performance has little effect,the aspect ratio can be set to 1 and the thickness is chosen to be 6mm.Low yield point steel damper has better energy consumption than ordinary steel damper.(5)The test specimens are optimized,a set of optimal solutions is selected,and the original one-cycle band is changed to 2 cycles,and the load capacity and energy consumption capacity of the damper are improved after optimization.For the horizontal corrugated steel plate damper,the load capacity of the optimized damper is increased by about 5%,and the energy consumption capacity is significantly increased.From the initial stage of loading to the end of loading,the equivalent viscous damping coefficient of the damper is always greater than that before optimization;Vertical wave plate damper,the load capacity of the optimized damper is 1.23 times that of the optimized front damper,and the displacement ductility coefficient is about 3.25 times before optimization. |
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