【摘要】 研究高强方钢管高强混凝土纯弯构件的恢复力模型，为该类构件的抗震设计和实际工程应用提供参考。进行6根高强方钢管高强混凝土纯弯构件的滞回性能试验研究，利用ABAQUS有限元分析软件建立大量精细化的数值计算模型，分析材料强度和含钢率对构件滞回特性的影响规律。随着钢材强度等级的提高，抗弯承载力近似呈线性增长，且随着含钢率的提高其线性增长速率增大；混凝土抗压强度对曲线下降段影响显著，强度越高，构件的脆性越大，延性相对越差；含钢率的改变对曲线弹性段刚度和抗弯承载力均有影响，且在不同钢材屈服强度作用下，其承载力随含钢率增大提高的幅度不同。确定了弯矩-曲率骨架曲线各特征点参数的计算方法，基于滞回准则，提出了适用于高强方钢管高强混凝土纯弯构件的恢复力模型。更多还原

【Abstract】 The restoring force model of high-strength concrete filled high-strength square steel tubular members(HCFHSTs)under pure bending was studied in order to provide references for the seismic design and practical engineering application of such members.Six HCFHSTs under pure bending were carried out subjected to low-frequency cyclic loading.Then, lots of accurate numerical calculation models were established by using the finite element software ABAQUS to analyze the influence of parameters on the hysteretic characteristics of HCFHSTs under pure bending, such as the material strength and the steel ratio.The results indicate that the flexural bearing capacity increases linearly with the increase of the steel strength grade, and its linear growth rate increases with the increase of the steel ratio.The decreasing section of the curve is significantly affected by the concrete compression strength.The higher the strength, the greater the brittleness and the worse the ductility of the member.The change of the steel ratio has an effect both on the stiffness of the elastic section and the bearing capacity.Meanwhile, with the increase of the steel ratio, the increased range of the bearing capacity is different under different steel yield strength.Finally, the calculating method of each characteristic point of the moment-curvature skeleton cure was determined.And then, based on the hysteresis criteria, the moment-curvature restoring force model of HCFHSTs under pure bending was put forward.更多还原