Study Of Design And Performance Of A New All Sections Yielding Simultaneously Energy-dissipating Steel Bar Damper

Earthquake is a destructive and unpredictable natural disasters,often irreparable damage to the building structure,the new version of "China Earthquake Parameter Zoning Map" completely eliminates "no defense zone",the construction of the seismic performance put forward higher request,academia and engineering are increasingly attach importance to improve the seismic performance of the structure.Aiming at the following shortcomings of the existing metal dampers: Local fragility destruction is easy to occur due to uneven stress and strain,ductility performance is insufficient,It is difficult to play its role under the action of small earthquake and difficult to replace after earthquake.This paper proposes a kind of energy dissipation steel bar with all sections yielding simultaneously,and designs an all sections yielding simultaneously energy dissipation steel bar damper,and analyzes the performance of the damper by using the finite element software ABAQUS.This paper mainly studies the following contents:(1)Based on the mechanical characteristics of the energy dissipating steel bar,which is mainly subjected to bending moment when lateral displacement is applied,and according to the relevant calculation formulas of structural mechanics and material mechanics,the energy dissipating steel bar with all sections yielding at the same time is designed.(2)According to the characteristics of energy dissipating steel bar,an all sections yielding simultaneously energy dissipating steel bar damper is proposed.The damper is simple and beautiful,used with V-shaped support,easy to install and wide applicability.(3)The hysteretic curve of the damper is obtained through numerical simulation,and the mechanical parameters of the damper are obtained.The hysteretic curve of the damper is similar to a horizontal quadrilateral and the bilinear model can be used as the restoring force model.(4)The influence of the number,radius and length of energy-dissipating steel bars on the energy-dissipating performance of the damper was analyzed by numerical simulation.It is found that the three factors have a significant effect on the performance of the damper.On the whole,the energy dissipation capacity of the damper increases with the increase of the number and radius of the steel rod,and decreases with the increase of the length.(5)The displacement amplification frame is introduced to enhance the energy dissipation capacity of the damper and improve the utilization rate of materials.It is found that the energy dissipation characteristics of the damper are not affected by doubling the displacement amplifying frame,and the energy dissipation capacity of the damper increases with the increase of displacement magnification.However,in order to ensure the stability of the damper,the displacement amplification factor should not be more than 3 times.