Studies On Integrate Axial Compression Ratio And Shear Span To Depth Ratio For Aseismic Design Of Columns Of Frame Structures

Reinforced concrete structure is a widely used structural form and its earthquake resistant conduct has been made both at test studies and theoretical analysis,. Based on that, this thesis analyses the main factors of earthquake resistant of reinforced concrete frame columns. According to practical experience of frame columns, the method of calculating four line hysteretic model is provided, which includes a downward section, based on that , the N-M-φ curve that calculates the influence of axial force in earthquake is a better method for elastic-plastic time-history model. When make a finite element analysis, we usually choose the beam element that relates stress — strain curves and section characteristics, but this method cannot truthfully simulate the decline of carrying capacity and rigidity degenerate of hysteretic model when the members been plastic. Therefore, the finite element theory of moment-curve beam element is introduced and used in ADINA soft to calculate the hysteretic model.When we design reinforced concretes, the size of frame column section is usually considered only according to the requirement of axial compression ratio, but overlooks the influence of shear span to depth ratio. This thesis makes use of the four line hysteretic model, carrying on the earthquake-resistance analysis and push-over analysis of which two kinds of models whether considering shear span to depth ratio separately, gaining the earthquake-resistant influence of shear span to depth ratio to reinforced concrete and proposes that we should integrate axial compression ratio and shear span to depth ratio for the design of frame columns when we design reinforced concrete frames.