| The first high-rise steel structure built in Shanxi province which increased height with steel structure is based on existing structures through the transition layer. Currently similar research inland lacks systemic research and reasonable engineering design reference case. With these difficulties like the number of add-floors and the complexity of structure are analyzed, the project is few in domestic area. In order to increase this building from 4 layers to 8 layers, according to the present criterion and standards which we cite an engineering example to carry integrated dissections. The idiographic work and appropriate conclusion include several aspects as follows:1,Structure reinforcement design for first high-rise steel structure apartment in shanxi provinceAppearance of defects, Bore core method and UT was used to detect original structure, analysis and calculation was based on Midas Gen, basic property comparison of the post-test model and the original structure model was made to select optimal reinforcement design of the development in order to improved ductility and loading capability, it provided the most important precondition for the adding story.2,Story-adding design for first high-rise steel structure apartment in shanxi provinceAppropriate parameters was set accord to the basic requirements to select Structural Arrangement and structural system, the units of sideways force and members of levels force are designed; according to the fundamental assumptions underlying architectural design, integrated numerous factors, on the premise of adding steel storeys, establish two extra layer of the scheme under the existing structure (the dual steel structure)("4 layer of Steel+14 original structure"), The purpose of this section is in order to choose the best program for the design and analysis.3,The whole structural analysis for first high-rise steel structure apartment in shanxi provinceUtilizing the finite element analysis software Midas Gen and Pkpm, we do analysis for two schemes including structural finite element analysis (non-seismic analysis and seismic analysis). By analyzing (model pattern analysis, analysis of seismic response, acceleration time analysis) of two different structures that we could compare the different lateral displacement Inner Force and economic indicators between the two different structures then found the most optimal option; The optimal scheme was adopted in this paper based on Midas Gen, Etabs analysis software and hands calculate method. It analyzed the foundation bearing capacity problem and bottom reinforcement columns after adding storeys stress performance, safety reserve problem emphatically, made such complex engineering case keeping a good deformation ability and security stockpile under the condition when there were contradictions with criterion, achieved moderate seismic performance objectives; This paper mainly discussed the steel structure and concrete mechanical characteristics, made a holistic analysis of its interface by two different processing means which based on Midas Gen software, and verified rigid connection of transition region between the steel structure and reinforced concrete structure was an effective means for overall safety and stiffness mutations reduction. |