【摘要】 进行6根冷弯薄壁方钢管混凝土简支梁在循环荷载作用下的试验,研究了试件的破坏形态,并对其荷载-位移滞回关系曲线及其骨架曲线进行分析,研究其在不同参数下的滞回性能、延性等重要抗震性能指标.得到的主要结论如下:⑴冷弯薄壁方钢管混凝土简支梁荷载-位移滞回曲线呈梭形,较为饱满,没有出现明显的捏缩现象,表明构件具有较好的延性和耗能能力.⑵宽厚比越小,滞回曲线梭形越饱满;跨高比越小,滞回曲线梭形也越饱满,构件的塑性变形能力越强,具备更好的地震吸收能力和优越的抗震能力.⑶比较荷载-位移滞回曲线的骨架曲线,不同参数对冷弯薄壁方钢管混凝土梁的竖向承载力影响很大.更多还原

【Abstract】 Six concrete-filled thin-walled cold-formed square steel tubes beams in cyclically loading were tested.The author researched the failure mode,analysed the load-displacement hysteretic curves and its frameworks curves through the experiment.Some different parameters of earthquake resistant capability can be reviewed,such as hysteretic behavior and ductility.Some important conclusions can be drew as follows: ⑴The shape of load-displacement hysteretic curves of concrete-filled thin-walled cold-formed square steel tubes beams like a spindle.It is of satiation without obvious phenomenon of rheostriction.The members accordingly have good capacity of ductility and energy dissipation.⑵If the width-thickness ratio is smaller or the span-height ratio is smaller,the plumper of the load-displacement hysteretic curves spindle shape is well,and it shows the better capacity of plasticity,then it is provided that it has better properties of resisting the seism.⑶ The different parameters have great influence on the vertical bearing capacity of concrete-filled thin-walled cold-formed square steel tubes beams after analysed its framework curve of load-displacement hysteretic curve.更多还原