| As a kind of energy dissipation device,tuned inertial damper(TID)has become a research hotspot because it can effectively suppress the seismic response of structures.In this paper,frame structure and three-span continuous girder bridge considering FPS hysteretic performance are studied under random excitation.The vibration absorption design of TID considering the binary optimization of frequency and damping and the vibration absorption design considering the ternary optimization of inertial mass,frequency and damping are compared.The improvement effect of adding the optimization of inertial mass on the shock absorption performance of TID was explored.The main contents are as follows:(1)Considering the random excitation as filtered white noise,the augmented state expression of multi-layer frame structure and TID distribution between layers is established.Taking three-layer and ten-layer frames as examples,achieving global optimization under random excitation with given inertial distribution and frequency and damping binary parameters of TID,then the optimization design with three parameters considering inertial mass,frequency and damping is realized.The evolution of optimization parameters with the change of total inertia mass was investigated.The mechanism and effect of adding inertial mass as parameter to improve the shock absorption performance of TID were revealed.(2)A simplified model of three-span continuous girder bridge with frictional pendulum support(FPS)is established,Simulate FPS hysteresis performance with Bouc-wen model;Based on the optimization design of a single TID,the effects of friction coefficient of FPS and random excitation intensity on optimization parameters and damping performance were investigated Considering the optimization design of multiple TID,the improvement effect of ternary parameter optimization after the number of TID and the increase of inertial mass on the damping performance was illustrated.(3)Considering the main girder flexibility and multi-mode seismic response effect of continuous girder Bridges,a multi-degree-of-freedom fine model was established to explore the optimization design and shock absorption effect of spatially distributed TID.The optimal design of multi-TID considering inertial mass,frequency and damping was realized by considering the seismic excitation in both longitudinal and transverse directions.Compared with the simplified model,it is illustrated that the TID design based on the simplified model can achieve good shock absorption effect in longitudinal bridge direction,while the ternary research on seismic control considering the inertial quality optimization can significantly improve the shock absorption effect in transverse bridge direction. |
