Study On Aseismatic Capability Of The Shearwall With Different Steel Ratio In SRC Structures

With the development of China economic, more and more high-rise and ultra-high-rise buildings were built and attracted people's attention with theirs beautiful shapes, providing a comfortable life and office environment, what the structure of system, how to assess and guarantee the its role in seismic reliability, is one of the many workers in seismic studies. As people were gradually aware of the defects of concrete structures and steel high-rise building, more and more hybrid structures were used. This thesis mainly studies the effect to aseismatic capability of the SRC Core structure when steel ratio of the shearwall is changed ,and researches the SRC shearwall's stress,strain and displacement on the load.In the SRC Core structure system, the core shearwalls bear greater force. In order to pass shear force of frame beam to shearwall better, and reduce the concentration damage in the junctions of shearwall and frame beam , we always set up SRC columns in the junction . Using this method ,we can reduce the component section size, increase the architectural space, improve the poor ductility of reinforced concrete shearwall .In this paper , the current domestic and foreign steel-concrete hybrid structure of the application and research of the status quo at home and abroadas well as steel-concrete hybrid structure of the basic principles is summed up. Discussed Finite element theory and Pushover analysis of the principle, assumption ,implementation steps,the structure of the mechanical model, the selection of seismic waves, the advantages and disadvantages of the analytical methods and the current state of development, give opinions about in-depth study of the problem.With the PKPM, the floor-shearing forces , floor displacements and axial compression ratio in bottom shearwall of the SRC Core structure on small earthquake and big earthquake is analyzed when steel ratio of shearwall is changed, and the rule is found : when the steel ratio is increased, the floor shearing forces and displacements and axial compression ratio are controlled comparing with the RSC structure. So the SRC columns can improve the poor ductility of reinforced concrete shearwall .At last, the SRC node's stress,strain and displacement are calculated with ANSYS and according to the solution, the breakage mode is analysed. Setting up SRC columns in the junction can reduce the concentration damage in the junctions of shearwall and frame beam effectively. Not the steel ratio is the bigger the better . While the steel ratio increased to a certain value,the effection for shearwall is stabilized. The common steel ratio in engineering is 5%-8%. In this thesis, SRC shearwall has better ductility while steel ratio is 6%-8%.It is Suggest that steel ratio would better greater than or equal to 7%.