Reinforced Concrete Frame Structure Nonlinear Hysteretic Analysis With Shear Effect

It has long been on the nonlinear analysis of reinforced concrete structures, Only to consider the role of the axial force and bending moment, Shear effects neglected. To relatively large shear span of components usually get relatively accurate results, But the relatively small cross-cut situation is likely to cause very large errors.At present the domestic and foreign scholars have done the relevant research, Nowadays to lead the modified compression field theory (MCFT) into reinforced concrete elements of nonlinear finite element analysis has been mature relatively when taken the shear influence into account. In considering the effect of shear deformation ,The foreign country can be make nonlinear finite element analysis when the reinforced concrete elements under monotonic loading and hysteretic loading successfully.the domestic can just make the reinforced concrete elements nonlinear analysis in cross-section levels, For element levels can just make nonlinear finite element analysis when the reinforced concrete elements under monotonic loading.To the questions above the main work as below :Basing on the finite element stiffness method and MCFT, Along the fiber, section, unit, structure of this from the micro to macro, From local to the whole idea,Have derived reinforced concrete element theory which considering the effect of shear deformation ,Used the modified fiber model which can be considering effect of shear deformation to simulate the complex nonlinear relationships of section force and deformation under pressure, bending moment, shear of the coupling, applied finite element stiffness method and the modified fiber model considered shear effect to the nonlinear analysis of overall structure under hysteretic loading. Programed the two-dimensional hysteretic constitutive relationship of concrete which can consider the effect of shear deformation, Re-programed the one-dimensional steel hysteretic constitutive relation. And successfully resolved some problems that may only happen in the hysteretic analysis such as iteration does not converge, material history variables to save the update and so on. Extended the original nonlinear analysis program which can consider the effect of shear deformation about reinforceed concrete frams under monotonic loading process to reinforceed concrete frams under low-cycle hysteretic loading .Numerical simulation on the representation of tests have been made to verify that the program is effective and reliable. Program made more successfully the whole process of analysis about reinforced concrete frame structure under hysteretic loading paths , The conclusion have been got that if the effect of the shear deformation is taken into considertion it can be better simulation the test. This procedure can better predict the ultimate load but can not well simulated the "pinch effect " which the structural member under hysteretic loading, This mainly the relatively simple hysteretic rules was used, A number of factors not taken into account . Hysteretic rules need to be improved.