Research of Application Status and Existing Problems for Light Steel Structure with Added Storey

According to the study of added stories structure form for existing buildings, the basic form and characteristics of existing four added stories structure were analyzed and summarized in this paper. According to the research, light steel structure with added storey as a economic and effective method of strengthening design for existing building, it is promoted and applied widely. But there are some problems in the identification of design standard, the reasonable choice of structure scheme, the calculation of Seismic effect and constitution design to be solved.