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对钢管混凝土在循环荷载作用下的非弹性弯曲性能进行试验研究。对可变振幅循环荷载系列下,不同尺寸的钢管混凝土进行控制旋转、均匀循环弯曲试验,表明钢管混凝土梁具有局部弯曲稳定的滞后性能,可根据D/t比值说明强度和延展性的退化。根据强度、滞回曲线和破坏模式,提出抗震性能参数。在循环试验中获得的最大弯矩与采用钢和混凝土规定中所预测的弯矩进行比较,确定适合抗震结构系统设计和建造的新长细比限值。对新长细比限值与设计规范中的限值进行比较。
Experimental study on inelastic bending behavior of concrete filled steel tube under cyclic loading. Under the cyclic loading of variable amplitude series, different sizes of CFST were controlled and rotated, and the uniform cyclic bending test was carried out. It shows that the concrete filled steel tube has the property of local bending and stable hysteresis. The degradation of strength and ductility can be described according to the D / t ratio. According to the strength, hysteresis curve and failure mode, proposed seismic performance parameters. The maximum bending moment obtained in the cyclic test is compared with the predicted bending moment in the steel and concrete provisions to determine the new slenderness ratio suitable for the design and construction of aseismic structures. The new slenderness ratio is compared with the limits in the design specifications.