Research And Optimization On Numerical Analysis Of The Box Foundation-butterflies Structure

This article takes a box foundation-butterfly structure as the research object and uses numerical simulation methods to study the seismic performance of the structure.A numerical model of the box foundation-butterfly structure was established;the modeling method was applied to a similar box foundation in the literature,and the numerical analysis was carried out and compared with the measured engineering data to verify the accuracy of the numerical analysis results;consider the butterfly When the angles of the structure wings are 30°,60° and 90°,the EI-centro wave,San Fernando wave and Taft wave are used as excitations to analyze the dynamic time history of the entire box foundation-butterfly structure,and the box shape is studied.The displacement response and acceleration response of the foundation structure under different seismic waves;the connection form between the butterfly structure and the box foundation and the influence of the size of the butterfly structure’s wings on the overall seismic performance of the structure are discussed,and an optimization plan is proposed.The main conclusions are as follows:(1)Under the excitation of seismic waves,the trend of the displacement time history curve of the measuring points on both sides of the box foundation is basically the same,and the displacement values are not much different,indicating that the box foundation has strong integrity and seismic performance in the seismic response process.good.(2)When the wing angle of the butterfly structure is 60°,the peak displacement and peak acceleration are the largest,indicating the most unfavorable seismic performance at this time.At the same time,it shows that with the increase of the wing angle of the butterfly structure,the displacement response and acceleration response of the structure first increase and then decrease.Therefore,it is recommended to avoid the wing angle of 60° in the design of similar butterfly structures in the future,which is more conducive to the seismic performance of the structure.(3)The weak part of the butterfly structure is at the apex of the wing,and the weak part of the box foundation is in the middle part.Attention should be paid to strengthening when designing the seismic performance.(4)There is a phenomenon of separation and then contact between the box foundation and the foundation soil,indicating that the box foundation is constantly swaying during the seismic response process.It is confirmed that the box foundation can only be swayed when it has strong anti-overturning ability.Better exert its seismic performance.(5)The addition of connecting members to the box foundation and butterfly structure can weaken the seismic wave transmitted to the butterfly structure,effectively reduce the displacement and acceleration of the overall structure under seismic response,and have a good effect on the overall seismic resistance of the structure.At the same time,it analyzes and compares the influence of three different cross-sectional size connecting members on the seismic performance of the structure.It is proved that when the cross-sectional size of the connecting member increases and the stiffness increases,the overall displacement and acceleration response of the butterfly structure first decrease and then increase.Therefore,considering the structural seismic performance,engineering cost and other factors,the selection of connecting members should not be too large.(6)Optimize the overall seismic performance of the structure by changing the size of the wings of the butterfly structure.Appropriately reducing the size of the wings is beneficial to the seismic performance of the butterfly structure,and while meeting the design requirements of the structural appearance,reducing the width of the wings as much as possible can enhance the seismic performance of the structure more than reducing the length.