Seismic Capacity And Loss Assessment Of Concrete Column-steel Beam Hybrid Structure System

Earthquake is one of the most destructive and devastating natural disasters,whose potential destructive power can cause serious damage or even collapse of buildings,resulting in tens of thousands of casualties and property losses.Dynamic time-history analysis is more suitable for the anti-seismic capacity evaluation of high-rise or super-high-rise structures because it can truly reflect the structural response under a specific earthquake intensity.The economic performance analysis,proposed in the FEMA-P58 report given by the Federal Emergency Management Agency(FEMA)in “Next-Generation Performance-based Design” research project,can evaluate the post-earthquake economic loss and repair time of structures from an economic perspective to provide reference for the operation of the whole life cycle of structures.In this paper,the anti-seismic capacity of three new hybrid structural systems with reinforced concrete column-steel beam(RC-S),concrete filled tubed column-steel beam(CFST-S)and tubed concrete column-steel beam(TC-S)is evaluated by the dynamic time-history analysis and FEMA-P58 economic performance analysis.The main contents are as follows:(1)Based on the ABAQUS platform,finite element models of the super high-rise CFST-S main structure and the hybrid structure formed by the combination of main structure and internal light steel substructure are established.The accuracy of the ABAQUS model is verified by comparing the natural vibration periods and displacement curves calculated by the original Yingjianke model and the ABAQUS model.By comparing the natural vibration periods of the main structure with that of the hybrid structure,it is pointed out that the combination of substructure has adverse effects on the main structure.By comparing the structural responses of the main structure and the hybrid structure under frequent and rare earthquakes,the influence of the combination of substructure on the seismic performance of the main structure is analyzed.(2)In view of the insufficient research on anti-seismic capacity evaluation of RC-S,CFST-S and TC-S hybrid systems,the RC-S and TC-S hybrid structures are designed according to the basic information of CFST-S hybrid structure,the ABAQUS finite element models of RC-S and TC-S hybrid structures are established,a large number of actual and artificial ground motions are selected based on the Chinese code,and the structural responses of RC-S,CFST-S and TC-S hybrid structures under frequent earthquakes,basic earthquakes,rare earthquakes and very rare earthquakes are calculated.The anti-seismic capacity of the three hybrid structures is compared.(3)Economic performance analysis based on vulnerability curves and result functions proposed by FEMA-P58 report is adopted,classification and quantitative statistics of performance groups of hybrid structures are finished.By comparing the exceeding probability curves of the economic loss and maintenance time of RC-S,CFST-S and TC-S hybrid structures and the histogram of floor distribution of post-earthquake maintenance time of structural and non-structural components,which are calculated under different earthquake intensities,the differences of economic performance of different hybrid structures under different earthquake intensities are pointed out and the anti-seismic capacity of different hybrid structures is evaluated from the perspective of economy.