The Method And Research Of Story-adding Fram Structure Based On Overall Dynamic Performance Analysis

Along with development of economic,lands for city constrction lack gradually and price of land and housing rise quickly. Story-adding of the existing buildings is a good way to solve the problem above and also an effective way to solve the housing problem present .Additionally,many structures nend strengthening and adding stories to meet require of modern life. Therefore, the theory and technologies of story-adding and alteration on existing building is a chief branch of structure engineering at present. The research on the connection method and performance of existing building with new added structure, and the holistic behavior of the story-adding building is significant and valuable to improve the development of the industry of the building reinforcement and reconstruction.According to the research on the working mechanism and function of the interface of the new-old concrete, rendered the method that not only setting horizontal roof beam on the interface of the new-old concrete, but also planting reinforcing bar on it. Using numerical analysis method to analyze the dynamic characteristics of three models and the dynamic response under three seismic waves for six stories disposable, four-story added to six-story building just with horizontal roof beam and its with horizontal roof beam adding planting reinforcing bar. Getting the deformation,displacement,story drift,story shear force and other parameters of a multi-layer structure under Earthquake through analysis and comparison of these parameters, and the reasonable height and the right horizontal beam spacing and anchor bar Anchor bar diameter, the proposed works in practice and generally the horizontal beam height 300mm, anchor bars spacing 400mm, diameter of anchor bar 16 ~ 20mm.The further thoroughly studies on adding extra-floors spanning existing buildings,which have definite reference value for improving the strengthen design code of concrete structure and Technical code for adding stories of brick-concrete structures of buildings ,as well as similar project design and construction reference.