Study On Seismic Performance Of Four Square Adjacent Structures With Dampers

With the development of social economy,modern urban buildings are becoming more and more dense,and adjacent buildings are becoming more and more common.The collision between adjacent buildings is one of the important reasons for the destruction and collapse of structures during natural disasters such as strong winds and strong earthquakes.It is an urgent task to strengthen the energy dissipation performance of adjacent structures.Control of two adjacent structures has been relatively mature,but in real life,three or four or more adjacent structures are often found.It is necessary to study the adjacent structures of multiple structures.At present,there are very few researches in this field.This paper will make a preliminary exploration on the damping characteristics of four adjacent structure control models.In this paper,the seismic responses of four square adjacent structures are studied.And the seismic response of the adjacent structures with viscous dampers is discussed.The main research contents and achievements of this paper are as follows:First of all,the paper explains working principle of viscous damper and analyses several commonly used mechanical models.The Maxwell model used in this paper is studied in detail.The parameters of viscous dampers are analyzed,including the value of velocity index and the relationship between velocity index and energy dissipation.And a detailed study is carried out to lay the foundation for the study of seismic reduction of existing structures using viscous dampers.Then,taking the low-dimensional physical model as the research object,the motion analysis of the four connected structures under earthquake action is carried out.The structures installed with appropriate viscous dampers are studied in this paper,which suffer from two natural waves and two artificial waves.Seismic response of the structure is analyzed by self-programming.By analyzing and comparing the displacement response,acceleration response and energy dissipation of the structure model,it is found that the dampers produce good damping effect.Next,the simplified bar system model is established by using the finite element software SAP2000.And the energy dissipation performance of four adjacent structures is studied.The seismic responses of adjacent structures with four square arrangements connected by viscous dampers are analyzed,and the damping parameters of dampers are optimized.The seismic responses of controlled adjacent and uncontrolled adjacent structures with different mass ratios and stiffness ratios under four different seismic waves are observed.It is an optimization goal to minimize the maximum relative displacement of structure under the action of seismic waves.The corresponding optimal damping coefficient is obtained by trial calculation.The relations between mass ratio,stiffness ratio and optimal damping coefficient are discussed respectively.Two relations between optimal damping coefficient and mass ratio and stiffness ratio are obtained.Finally,taking the multi-storey steel frame structure as an example,the three-dimensional steel frame model composed of 15 layers,18 layers,20 layers and 25 layers is established by the finite element SAP2000.Applying the conclusion formula obtained in the previous section,the amount of viscous damper added is calculated,and the energy dissipation effect of the structural system is analyzed.Through the comparative analysis of seismic response,the reliability and practicability of the above conclusions are verified.