Research on aseismic design of outer-jacketing mega frame for storey-adding

For the reason that the research on outer-jacketing mega frame for storey-adding' collapse and design method that considering construction lags behind that of practice, outer-jacketing mega frames for storey-adding in Site-class I-III, design seismic group 1^st -3^rd, seismic fortification intensity 7-8 were analyzed and the collapse mechanism was studied by elasto-plastic analyze program IDARC2D. It reveals that the design of bottom frame is the key point to make the structure damaged with beam-hinge mechanism. Measures to avoid collapse of structure by enhance the grade suitably were put forwarded. Construction technical measures were refined according to construction practice, design method was presented based on the elasto-plastic analysis results, that provide preference for the design of outer-jacketing mega frame for storey-adding.