Comparative Study Of Different Layout Schemes Of Viscous Dampers On Floor Response Spectra

The correct seismic fortification of ancillary facilities,secondary structures or non-structural components cannot be ignored in engineering design.Their safety has become a subject of seismic design.As an important basis for their seismic design,floor response spectrum is the result of the interaction between ground motion and the main building structure.It is necessary to select the reasonable and effective layout position of viscous dampers and consider the relationship between different layout schemes of viscous dampers and floor response spectrum for the damping structure.In this paper,four layout schemes of viscous dampers were proposed.By comparing the value of floor response spectrum and the displacement of the top floor under different ground motions,the optimal layout scheme was selected.Under the optimal arrangement of viscous dampers,the effects of different floor heights,different damping ratios and different peak ground acceleration on the floor response spectrum were studied;Under the optimal arrangement,the relationship between the magnitude of the floor response spectrum and the damping coefficient C and velocity exponentαof the viscous damper was discussed.The floor response spectrum guides the design of non-structural members,and the stress time history analysis of non-structural members under different arrangement schemes of viscous dampers was studied.The conclusions are as follows:（1）Four layout schemes of viscous dampers were proposed.The result finds that the floor response spectrum curves are different under different types of ground motions.However,when viscous dampers form a triangular,the value of floor response spectrum is the smallest.Under the action of near fault pulse ground motion and far-field long-period ground motion,the damping effect of viscous damper is better.（2）The optimal layout scheme of viscous dampers is selected.By comparing the floor response spectra at different floor heights,different damping ratios and different peak ground acceleration under the action of near fault pulse ground motion and far-field long-period ground motion,it is found that the value of floor response spectrum decreases along the direction of floor reduction;The larger the damping ratio,the smaller the value of floor response spectrum;The greater the peak ground acceleration,the greater the floor response spectrum.However,the changes of floor height,damping ratio and peak acceleration have little effect on the trend and shape of floor response spectrum.（3）For this damping structure,the sensitivity of floor response spectrum to different parameter combinations of viscous damper was discussed,it is found that under the action of near fault pulse ground motion,when the viscous damper is optimally arranged,when the damping coefficient of viscous damper C is 500 k N·mm·s^-1 and the velocity indexαis 0.5,the value of floor response spectrum is the smallest;Under the action of far-field long-period ground motion,when the damping coefficient of viscous damper C is 300 k N·mm·s^-1,velocity indexαis 0.5,the value of floor response spectrum is the smallest.（4）Under different arrangement schemes of viscous dampers,the stress time history analysis of non-structural members was carried out.The results show that the total deformation and equivalent stress of non-structural members are different under different arrangement schemes of viscous dampers.However,the position of the maximum value of total deformation and equivalent stress is the same.The maximum value of total deformation appears in the middle of non-structural members,and the maximum value of equivalent stress appears at the outlet end.