Study On Seismic Mechanism Of Hybrid Control Frame-wall Structure With Energy Dissipation Cladding Panel And Base-isolation

The precast concrete(PC)frame-wall structure with energy dissipation cladding panel(EDCP)were proposed,in which the U-shaped steel dampers(USDs)were introduced between the cladding panels and main structure to dissipate seismic energy,thereby reducing the damage of the main structure.Firstly,a systematic study on the seismic performance of precast concrete frame-wall structures with EDCP was carried out,and the effect of the EDCP on the seismic performance of frame-wall structure was clarified.Although the EDCP could effectively reduce the displacement response of the main structure,it was poor for EDCP to control structural acceleration response,and then the damage of acceleration-sensitive components was not alleviated,hence,the seismic performance of the structure needed further improvement.Meanwhile,the base-isolated structure could significantly reduce the structural floor acceleration,but the different levels of damage still appeared in the structure with base-isolation under major earthquake and mega earthquake,resulting that goal,the structures needed no repair or only simple repair after the earthquake,could not be achieved.Based on this,a hybrid control frame-wall structure with EDCP and base-isolation was proposed,and then the seismic mechanism of such structure was investigated.The main work of this paper are as follows:(1)The experimental data of 17 USDs were collected,and mechanical properties of USD and the effect of critical geometric parameters on mechanical properties were analyzed.Then the refined finite element modeling methods of USD,which is suitable for the analysis on the member level,was proposed and validated based on the collected data.The theory formulas of critical mechanical parameters were proposed to further investigate the simplified finite element modeling methods which is suitable for the analysis on the overall structure level.(2)Based on pseudo-static loading test on a full-scale PC frame substructure with EDCP,which was conducted previously by the research team,a multi-scale numerical simulation method was proposed and validated.Subsequently,the seismic response,failure mode and energy dissipation capacity of the bare PC frame-wall structure and PC frame-wall structure with EDCP were compared based on the multi-scale numerical simulation method,thereby clarifying seismic mechanism of such structure and the influence of damping design parameters(stiffness ratio and yield force ratio)on seismic performance.(3)A hybrid control PC frame-wall structure with EDCP and base-isolation was proposed.Then the seismic response of the base-isolated PC frame-wall structure with and without EDCP is compared based on the multi-scale numerical simulation method,thereby clarifying seismic mechanism of such structure and the influence of damping and base-isolation design parameters on seismic performance.(4)Based on the "Standard for seismic resilience assessment of buildings",the seismic resilience assessments of the bare PC frame-wall structure,the PC frame-wall structure with EDCP,the base-isolated PC frame-wall structure and hybrid control PC frame-wall structure with EDCP and base-isolation were conducted respectively,and then the level of seismic resilience was evaluated according to casualties,repair time,restoration cost of buildings.Finally,the repair time and restoration cost of different components were analyzed in detail.