The Internal Force Research About Multilayer And High-rise Split-level Structure

With the high-speed development of the civil engineering industry, the form ofbuilding is more and more diverse, from the development of the initial buildingheight to now the change of the layout of the building. Split-level structure is oneof relatively popular innovative forms at present. But what follows is the weak partof the split-level structure, which is unfavorable for the earthquake. This wordprincipally researches the frame-shear wall structure by finite element software andrelated norms and literature, which studies the regular split-level structure andirregular split-level structure compared with the ordinary structure, including thelayer displacement, floors shear, and lateral stiffness and so on. The main workcontent as follows:First, set up the finite element analysis model of the three structures bySAP2000with an engineering example, and research their changes of deformationand internal forces through modal analysis and response spectrum analysis.Second, analyzed the varieties of deformation and internal forces of the threestructures in different seismic intensity.Third, calculated the three structures complementally in the multi-caseearthquake and rare earthquake using dynamic time history analysis method toprove the weak parts of the split-level structure.Fourth, researched the changes of deformation and internal forces of thesplit-level structure with the CFST columns to provide recommendations tochoosing seismic strengthening measures reasonably.Through the analysis of this research, can show that:First, the split-level structure has lager lateral stiffness and smaller layerdisplacement due to the emergence of the short components. But they will absorb alarge horizontal shear under horizontal seism, and prone to brittle failure because ofthe poor ductility. The phenomenon is enhanced with the increase of seismicintensity.Second, the irregular split-level structure can reduce the adverse effects ofearthquakes due to the presence of some unite floors. But it has mutation of thedisplacement because of the different floors’ height, resulting in irregular deformation of the structure.Third, it can increase the lateral stiffness of the structure that using the CFSTcolumns. It has higher bearing capacity and better ductility than the ordinaryconcrete column, so that it can reduce the structure adverse effects of the seismic.The structure should be supplemented by other seismic measures to resist theearthquake better.