Research On Collapse Simulation And Vibration Reduction Control Of Large-span Reticulated Shell Under Strong Earthquake

The collapse of large-span reticulated shells under the action of strong earthquakes has become an important issue of widespread concern and urgent solution.In order to improve the collapse resistance of large-span reticulated shells under strong earthquakes,this paper studies the collapse and vibration reduction control of large-span reticulated shells under strong earthquakes.Taking the Kaiweit reticulated shell as an example,the simulation analysis of the collapse of the large-span reticulated shell under the action of strong earthquakes is proposed.The metal rubber material is used to make a metal rubber material damper,and the energy dissipation and vibration reduction performance of the damper is verified through experiments.The damper is introduced into the large-span reticulated shell,and the vibration reduction control simulation analysis of the large-span reticulated shell under strong earthquakes is carried out,and the simulation results under the uncontrolled state and the controlled state are compared.Geting the following conclusions:1.The dynamic simulation of the whole earthquake process and the whole collapse process of the large-span reticulated shell are carried out,and it is concluded that the large-span reticulated shell undergoes three stages from destruction to collapse under the action of strong earthquakes:local collapse formation,slight damage;local collapse expansion,Serious damage,not collapsed;collapsed as a whole.2.Metal rubber materials have been used in the fields of aerospace,military and navigation as vibration damping materials in the past.Based on their excellent performance,this paper proposes to use metal rubber materials to make metal rubber dampers and apply the dampers to large spans.Vibration reduction control of the reticulated shell.The static compression test is performed on the damper,and the hysteresis curve of the damper is full,which proves that the metal rubber material damper can dissipate energy and reduce vibration.The force-displacement expressions for loading and unloading of the damper are obtained by fitting the test data.The force-displacement expression Riemann integral calculates that the loading force does work on the metal rubber material during the loading process,and the metal rubber material does work against the metal rubber material during the unloading process,so that the energy dissipation coefficient of the damper is calculated to be about 0.485,which proves that the metal rubber material damping The device has a good energy consumption capacity.3.The metal rubber material damper is introduced into the large-span reticulated shell,and three layout forms of the damper are given.When the peak seismic acceleration is 10 m·s-2,the uncontrolled large-span reticulated shell and the three types of reticulated shells are compared.The vertical speed of the apex of the large-span reticulated shell in the controlled state.The inclined rod,ring rod,and mixed arrangement of dampers reduce the vertical speed of the apex of the reticulated shell by about 30.3%,28.7%,and 31.6% respectively.The three arrangements reduce the apex of the reticulated shell.The effect of vertical speed is equivalent.The dynamic simulation and collapse simulation of the three large-span reticulated shells under the control state under the load value of the uncontrolled state of the large-span reticulated shell collapse critical load value,and the overall collapse of the uncontrolled structure critical load Comparing the values,inclined rods,ring rods,and mixed-arrangement dampers reduce the critical load values of the overall collapse of the structure by approximately 18.5%,29.6%,and 14.8% respectively.When the ring rods are arranged with dampers,the amount of dampers is relatively reasonable,which reduces the impact of earthquakes on the structure.The damage and improvement of the structure’s collapse resistance are the greatest.The use of ring rods and metal rubber dampers to control the vibration of the large-span reticulated shell is better.Metal rubber dampers can well reduce the damage of seismic waves to the reticulated shell,and have a good effect on the vibration damping control of the large-span reticulated shell under the action of strong earthquakes.