Energy Dissipation Retrofitting Research On Single Span Frame Structure Of Schools Building

In this paper, aimed at the problems existing in typical single span frame structure ofprimary and secondary schools building, energy dissipation upon column methods is proposedand used for seismic reinforce research. Adopting energy dissipation upon columnreinforcement scheme, and the traditional reinforcement scheme are comparative analysisunder frequent earthquake and moderate earthquake. The paper is researching reinforcementstructure with energy dissipation upon column under rare earthquake, the arrangement ofreinforcement scheme and parameter analysis with energy dissipation upon column. The mainresearch contents as follows:(1) Using energy dissipation upon column reinforcement and steel bracing reinforcement,shear wall reinforcement and verandah of column reinforcement and the original structure arepreliminary comparison the elastic time history analysis using the software ETABS underfrequent earthquake and moderate earthquake.The comparison results show that: in frequent earthquake, steel shear panel dampersmainly provide stiffness and drop out of energy, increasing lateral stiffness of the structure thesame as the other three strengthening schemes. Strengthening effect of energy dissipationupon column reinforcement is almost the strengthening effect of steel bracing reinforcementand superior to the strengthening effect of steel bracing reinforcement a little. In moderateearthquake, steel shear panel dampers began to energy dissipation. Control effect of the storydrift of the structure with energy dissipation upon column is better and story shear also have reduced. Strengthening effect of energy dissipation upon column reinforcement is superior tothe other three strengthening schemes.(2) In order to research the strengthening effect, vibration reducing performance andfailure modes of single span frame structure of schools building with energy dissipation uponcolumn reinforcement, using energy dissipation upon column reinforcement and the originalstructure are the elastic-plastic time history analysis using the software PERFORM-3D underrare earthquake.The analysis results show that: in rare earthquake, the original structure with energydissipation upon column reinforcement can achieve a good effect and solved the problemsexisting in the structure itself. To effectively control the typical failure model of single spanframe structure that verandah side columns damage result in total structure collapse.(3) In order to make the strengthening effect best, the arrangement of the energydissipation upon is studied, including different layout of reinforcement plan and differentspans under the same added stiffness ratio of the structure.The analysis results show that: For different layout of reinforcement plan, thestrengthening effect of min-spans layout is the best; for different spans under the same addedstiffness ratio, the strengthening effect of8spans is the best.(4) Analyzing the strengthening effect of different parameter of energy dissipation uponcolumn reinforcement scheme on frenqut earthquake and rare earthquake, including differentstiffness ratio of steel shear panel dampers and steel columns in the energy dissipation uponcolumn, different added stiffness ratio of the structure.The analysis results show that: For different stiffness ratio of steel shear panel dampersand steel columns, control of the structure of the stiffness ratio of2,3,4,5is better than other.Recommended stiffness ratio of2,3, material saving and convenient construction; fordifferent added stiffness ratio, the strengthening effect of added stiffness ratio of1,1.2,1.5isbest overall. Recommended added stiffness ratio of1,1.2,1.5.