Research On Vibration Reduction Effect Of Rooftop Swimming Pool

The swimming pool on the top of the building has become a highlight in architectural design.The rooftop swimming pool not only improves the comprehensive performance of the building and diversifies the use of the building,but also can meet the growing spiritual and cultura l needs of people in the new era.The research on the anti-vibration performance of the rooftop swimming pool structure is the key to determine whether the design scheme can be implemented.The rooftop swimming pool is regarded as a tuned liquid damper(TL D)device.Based on the displacement pressure format finite element method and Newmark prediction correction integral method,the derivation and solution process of the fluid structure coupling motion equation of TLD structure system are given in detail.T he fluid structure coupling solid model is established by using ABAQUS software,and based on the TLD equivalent nonlinear tuned mass damper(TMD)theory,an equivalent TMD model without considering fluid structure coupling is established in SAUSAGE.Taking a large-span roof standard swimming pool structure as the background,the influence of roof swimming pool on the anti-vibration performance of the structure under seismic load is studied,and the vibration reduction efficiency of fluid structure coupling is analyzed.The main research contents of this thesis are as follows:(1)Three commonly used numerical analysis methods of TLD are introduced in detail,and their advantages,disadvantages and application scope are summarized.Because the motion equations of single degree of freedom and multi degree of freedom system given by the simplified analysis method can not reflect the fluid structure coupling effect of TLD structure in the vibration process,the derivation process and solution method of fluid stru cture coupling motion equation of TLD structure system are given in detail based on the displacement pressure format finite element method.(2)The application principle of coupled Euler Lagrange(CEL)method in ABAQUS finite element software is introduced in detail.With the help of the three-layer steel structure experimental model in the existing literature,the fluid structure coupling solid model is established by CEL method in ABAQUS and the seismic response is simulated.The calculated results are ba sically consistent with the experimental results,which verifies the reliability of fluid structure coupling analysis by CEL method in ABAQUS.(3)Taking a large-span roof standard swimming pool structure as the background,the fluid structure coupling mot ion equation and CEL method are used to solve and calculate respectively.The displacement and acceleration time history curves of the two are basically consistent,which verifies the accuracy of the fluid structure coupling motion equation;The l arge-span roof standard swimming pool has obvious inhibitory effect on the seismic response of the structure in X and Y directions,which provides a reference for the design of the large-span roof standard swimming pool structure.(4)Based on the TLD equivalent nonlinear TMD theory,the equivalent TMD model is established in SAUSAGE.The calculation results show that the floor displacement and base damping rate of the fluid structure coupling solid model under earthquake are significantly improved compared with the equivalent TMD without considering the fluid structure coupling.Therefore,the influence of fluid structure coupling should be fully considered in the design of rooftop swimming pool.