论文部分内容阅读
提出了一个有效的理论模型,用于钢管混凝土圆形短柱在偏心荷载作用下的非线性弹塑性分析。理论模型中考虑了普通或高强钢管中填充的普通和高强混凝土的精确材料构成关系,用于计算混凝土强度和延性升高时对约束效应的影响。将偏心荷载下对钢管混凝土圆柱预测的极限抗弯强度和完整的弯矩-曲率曲线,与现有的试验数据进行对比以验证理论模型的准确性。利用经过验证的理论模型对圆形钢管混凝土梁柱的基本性能包括径厚比、混凝土抗压强度、钢筋屈服强度、轴向荷载水平和截面形状进行了研究。基于大量的数值研究,针对圆形钢管混凝土梁柱提出了一个用于确定极限纯弯强度的设计模型。理论模型和公式可以对偏心荷载下圆形钢管混凝土梁柱的非线性弹塑性性能进行有效的模拟和设计。
An effective theoretical model is proposed for the nonlinear elasto-plastic analysis of circular concrete short columns under eccentric load. The theoretical model takes into account the exact material composition of ordinary and high-strength concrete filled in normal or high-strength steel tubes and is used to calculate the effect of concrete strength and ductility on the restraint effect. The ultimate bending strength and complete bending moment-curvature curve predicted by eccentric load on cylindrical concrete column are compared with the existing experimental data to verify the accuracy of the theoretical model. Based on the validated theoretical model, the basic properties of circular CFST columns including diameter-thickness ratio, compressive strength of concrete, yield strength of reinforcement, axial load and cross-sectional shape were studied. Based on a large number of numerical studies, a design model for determining the ultimate pure bending strength was proposed for circular CFST members. The theoretical models and formulas can effectively simulate and design the nonlinear elasto-plastic behavior of circular CFST beams under eccentric load.