Development of A Computer Program to Calculate Inelastic Earthquake Response of Reinforced Concrete Structures with Variation of Axial Force

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In this project, a new mathematical model for nonlinear hysteretic response prediction of reinforced concrete structural sections and reinforced concrete integral structures under time-dependent arbitrary loads, inculding the effects of variation of axial forces, is presented. The applicability of the model is demonstrated by comparing the theoretical and experimental results obtaind by the newly developed Hybrid Loading System for Earthquake Response Computation (HYLSER). Because the model is based on formulated stress-strain relations for the constituent discretized element materials, the proposed analytical model is applicable for prediction of nonlinear hysteretic response of reinforced concrete, composite and steel structures under time-dependent static, as well as seismic, loads.From the agreement obtained between experimental and theoretical results, it is concluded that the mathematical model proposed herein canbe implemented for structural refined modeling; then the prediction of nonlinear hysteretic seismic response of integral structures can be done on the basis of direct integration of the dynamic equations of motion. Analytical procedure for the solution of such nonlinear dynamic problems has been established, and is being used to extend the developed computer program NORAI for realistic nonlinear seismic response prediction.