Synergy Analysis Of Joist Support Broadening Steel Structure With The Orignalreinforced Concret Structure

Recent years,with the rapid development of urban economy,land resource constraints,ecological issues and many other factors hold the renovation project to the historic peak.Owing to light weight,easy construction,appearance and little pollution,it be largely used in renovation project.In this article,Combining with Wei Jia-Wan actual renovation project and using the finite element software SAP2000,the author established analysis model of composite structure-broadening joist support steel structure and original reinforced concrete structure shared the original columns.Compare and analyze the change of original structure's force and deformation between the original reinforced concrete structure and the composite structure,and also the difference of steel structure's force and deformation when the steel beams and original columns connected with different forms under static and dynamic loads.Specific content and conclusions are as follows:(1)First,elaborate commonly used in engineering forms of steel beams and concrete,choose two different forms and modeling their simplified model.(2)Calculate and analyze two composite structure-steel beams and original columns connected with different forms under standard static load,the results show that under static load when steel beams articulated original columns the stress of the steel structure is more but the additional force on the original structure is less,when steel beams rigid connected with original columns the stress of the steel structure is less but the additional force on the original structure is more.(3)Analyze dynamic parameters,the results show that composite structure's steel part local vibration of beams articulated with original columns is earlier than the composite structure's steel part local vibration of beams rigid connected with original columns.(4)Contrast the result of the original and two composite structures under Y direction seismic spectrum analysis,the results show that after steel structure broadening,force and deformation of original structure become bigger,and when steel beams rigid connected with original columns is even more.(5)Do time-history analysis of original and two composite structures,results indicate that the next waves of three-term average of the calculation results are consistent with the results of response spectrum analyses.(6)For the joist support separate steel structure,model and analyze,and compared with the result of composite structure,the results show that adopt joist support steel structure to simplify the modeling calculation alone is feasible.