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对于新提出的方形高强钢管混凝土叠合柱的极限承载力,基于统一强度理论,考虑中间主应力和材料拉压比的影响,引入有效约束系数和非有效约束系数并考虑箍筋对钢管外混凝土约束作用的不同,把钢管外箍筋约束混凝土划分为有效约束区和非有效约束区,将方形截面等效为圆形截面以考虑钢管核心混凝土受到的钢管和外围钢筋混凝土的双重约束效应,提出了方形高强钢管混凝土叠合柱的一种新的轴压极限承载力计算方法。将所得理论计算结果与文献试验结果进行对比,吻合良好,证明了公式的正确性。对各参数的影响规律分析表明,方形高强钢管混凝土叠合柱的承载力随着侧压系数、中间主应力影响系数、材料拉压比和纵向配筋率的增大而增大,随着钢管径厚比的增大而减小。
Based on the unified strength theory and considering the influences of the intermediate principal stress and the material tension-compression ratio, the ultimate load-carrying capacity of the newly proposed square high-strength CFST columns is introduced, and the effective restraint coefficient and the ineffective restraint coefficient are introduced. The restraint effect is different, the confined concrete confined by steel pipe outer stirrups is divided into effective restraint zone and non-effective confinement zone. The square section is equivalent to a circular section to consider the double restraint effect of the steel pipe and the external reinforced concrete subjected to the steel core concrete A New Method for Calculating Ultimate Bearing Capacity of Square High Strength Concrete Filled Steel Tube Column. The theoretical calculation results obtained are compared with the experimental results of the literature, which are in good agreement with each other, which proves the correctness of the formula. The analysis of the influence of various parameters shows that the bearing capacity of square high-strength CFST columns increases with the increase of the lateral pressure coefficient, the influence coefficient of middle principal stress, the tensile ratio of material and the longitudinal reinforcement ratio. With the increase of steel pipe Diameter ratio increases and decreases.