可变振幅循环荷载作用下的纯弯曲冷弯圆形钢管混凝土梁

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。

Concrete-Filled Cold-Formed Circular Steel Tubes Subjected to Variable Amplitude Cyclic Pure Bending

This paper describes an experimental investigation of the cyclic inelastic flexural behaviour of concrete-filled tubes (CFT). Controlled-rotation, symmetrical cyclic bending tests were performed using a variable amplitude loading history on different sizes of CFT with different section slenderness. The CFT beams exhibited stable hysteresis behaviour up to local buckling and then showed considerable degradation in strength and ductility depending on the D/t ratio. Seismic capacity parameters are presented in...