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

本文提出了一种新的考虑轴力变化影响的钢筋混凝土结构截面和钢筋混凝土整体结构在时变任意荷载作用下的非线性滞回响应预测数学模型。通过对新研制的地震反应计算混合加载系统(HYLSER)的理论计算结果和试验结果的比较，验证了该模型的适用性。由于该模型是建立在离散单元材料的应力-应变关系基础上的，因此该分析模型适用于钢筋混凝土、组合和钢结构在时变静力和地震荷载作用下的非线性滞回反应的预测。从试验结果和理论结果的一致性来看，本文提出的数学模型可以用于结构的精细建模，然后在动力运动方程的直接积分的基础上进行整体结构的非线性滞回地震反应的预测。建立了求解这类非线性动力问题的解析法，并将其用于扩展开发的用于实际非线性地震反应预测的计算机程序NORAI。

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.