| Based on cantilever-toggle viscous system(CTV)with displacement response amplification mechanism,a new parallel cantilever-toggle viscous system(P-CTV)with displacement response amplification mechanism is proposed in this paper.And P-CTV,S-CTV(series cantilever-toggle viscous system)and TTV(traditional toggle viscous system)comparative study on the mechanical properties of three kinds of energy dissipation system,also with CTV energy dissipation system of high-rise structure damping control regularity of research,the main research contents and conclusions are as follows:(1)The deformation characteristics of frame-core tube structure are summarized,and a new P-CTV construction scheme is proposed.The selection design of P-CTV and S-CTV construction schemes is carried out,and the mechanism stiffness design method of CTV energy dissipation system is given.Finally,the feasibility of different CTV construction schemes is analyzed by numerical simulation.The theoretical results show that the two different types of CTV have high energy dissipation capacity,and their displacement amplification coefficients can reach more than 4 times that of the TTV.(2)Experimental study on mechanical properties of viscous damper is carried out.The results show that the experimental mechanical constitutive of viscous damper designed in this paper is consistent with the theoretical results,showing obvious deformation correlation and frequency correlation;Under the action of small,medium and large deformation,the hysteretic curve is full and approximately rectangular,with strong energy dissipation capacity.The performance is stable under variable amplitude continuous loading condition.Under fatigue condition,its hysteretic curve is still full and stable,and its thermal stability is good.Under the ultimate deformation,it can still maintain normal working state;It can be used as energy dissipation element in CTV energy dissipation system test.(3)The mechanical properties of CTV are tested.The results show that the two kinds of CTV energy dissipation system proposed in this paper have significant energy efficiency enhancement capacity,and their energy dissipation capacity is significantly greater than TTV;The correlation of deformation and frequency is obvious.Under the action of small,medium and large deformation and high and low frequency,the hysteretic curve is full and approximately rectangular,and the energy dissipation capacity is strong.Under various loading conditions,the energy dissipation system can keep good out-of-plane stability.The performance is stable under variable amplitude continuous loading condition.Under fatigue condition,its hysteretic curve is still full and stable,and its thermal stability is good.Under the limit deformation,it can still keep normal working state.(4)The regularity of the damping effect of the structure is analyzed from four aspects:the layout position of the CTV damping story,the layout number of the CTV damping story,the height of the CTV damping structure and the parameters of the viscous damper.The analysis results show that:With the increase of the layout height of single-channel CTV damping story,the damping effect of the structure increases first and then decreases.When the layout height of CTV is above 3H/11,the seismic response of the structure has a good damping effect.With the increase of the number of CTV damping story,the structure damping rate increases linearly.When the number of CTV is the same and the relative height is the same,the damping rate of the structure increases nonlinearly with the decrease of the structure height,and the energy ratio of the damper also increases.At the same structural deformation stage,the deformation damping rate increases gradually with the decrease of velocity index of viscous damper,while the base shear damping rate increases first and then decreases gradually.(5)An effective and practical design method of CTV structure is given,which can be used for reference in practical engineering.The nonlinear dynamic time history analysis of the framecore tube structure with CTV shock absorption story shows that the CTV energy dissipation system has good displacement amplification efficiency and shock absorption effect under different earthquake intensities.When the viscous damper with velocity index of 0.3 is used.the CTV damping story has the best damping effect in earthquake fortification.The damping force of P-CTV is 36.7%lower than that of S-CTV to achieve the same damping effect,which is more conducive to the support design of the suspension elbow connection mechanism. |
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