Design Analysis Of Shock Absorption Performance Of Multi-storey Steel Structure Workshop

With the technological progress and continuous development of manufacturing industry,more and more steel structure plants appear in people’s view,and the deployment of high budget equipment and important facilities in steel structure plants increases rapidly,which also puts forward higher requirements on the applicability and versatility of plants.There are restrictions in the traditional design idea,and the earthquake resistance simply by increasing the size of the elements can no longer fully meet the needs of industrial growth for the plant.Thus,the seismic property of multi-story steel structure plant has been fast growing.In this context,the energy dissipation and damping technology has received wide attention from various countries,and BRB and viscous dampers with good damping effect have gradually been widely applied to steel structure plants,The study of its vibration reduction capability has become a popular issue in the industry.For the features and demand of seismic resistance of multi-storey steel plants,the arranging and hybrid applications of various shock absorption devices need further research and improvements.In this paper,the effect of flexural restraint bracing and viscous dampers on the seismic performance of the building structure is investigated by modeling it with ETABS finite element analysis software,taking a multi-story steel frame plant as an example,two types of analysis approaches-modal analysis approach and time course analysis approach-are used to calculate the steel frame structure.With the use of three plausible earthquake wells,the shock absorption performance of buckling constraint support and viscous damper under different arrangement was analyzed,and a better shock absorption scheme was obtained.The main findings of this article were as following:(1)For the shock-absorbing structure with different BRB layouts,the maximum reduction rates of floor displacement of the monoclinic seismic structure(Model 2)and the inverted V-shaped seismic structure(Model 3)are 50.15% and 61.64% respectively compared with the original structure(Model 1).Under the action of rare earthquakes,compared with model 1,the vertex displacement of model 2 and model 3 is significantly reduced,and the shock absorption rate is 40.02%～73.94%.And the maximum values of inter-story displacement angles of the damping model are all smaller than the specified values,which meet the requirements.The seismic damping structure with BRB laid out effectively manages the vertex of the structure displacement,but also enlarges the basement force of the structure in shear and enlarges the structural overall stiffness.The laying of BRB in the steel building with the weak rigidity of large span could improve the structural bearing strength and enhance the stiffness of the structure when no earthquake happens;it can reduce the energy dissipation and strengthen the structural stability when earthquake happens.(2)The maximum reduction rates of the floor displacement of the seismic damper monoclinic layout(Model 4)and the inverted V-shaped layout(Model 5)of the seismic damper were 40.51% and 60.81% respectively under the action of earthquakes.Under the action of rare earthquakes,Model 4 and Model 5 can effectively control the vertex displacement of the structure compared with Model 1,and the shock absorption rate is13.02%～65.68%.And the maximum values of the inter-story displacement angles of the damping model are less than the specified values.which meets the requirements.The shock absorption structure with viscous damper can absorb the energy released by the earthquake,and the shock absorption effect is good.In the plant with high stiffness,the deployment of viscous damper can take the lead in consumption of energy during earthquake,quickly attenuating the structure’s response to the quake and protect the main structure and components from destruction to ensure the security of the structure.(3)Mixed earthquake mitigation structure,in multiple encounter with earthquake force,the vertex displacement reduction rate of the hybrid shock absorption structure(Model 6)is up to 25.67% compared with the shock absorption structure(Model 7)with BRB layout,and the vertex displacement reduction rate is up to 37.78% compared with the shock absorption structure(Model 8)with viscous damper laid out in Model 6.Under the action of rare earthquakes,the vertex displacement reduction rate of Model 6 was up to 50.22% compared with Model 7,and the vertex displacement reduction rate of Model 6 and Model 8 was61.03%.In the case of the same arrangement of damping devices,the hybrid shock absorption model can effectively control the vertex displacement of the structure,and the best shock absorption effect.In the structure of steel frame universal plant with high requirement of vibration absorption properties,it can give full effect to the damping characteristic of both and also achieve the aim of cost reduction.