论文部分内容阅读
进行了4组共36个冷弯薄壁方钢管长柱的轴心压力试验,考虑了长细比、不同填充材料两个变化参数,得到了试件的破坏模式及承载力等。结果表明,试验中空钢管柱发生失稳破坏,由于宽厚比较大,局部失稳发生后迅速导致整体失稳,而填充材料后的试件,局部失稳后承载力降低缓慢,依然可继续承载;空钢管侧向位移值不易满足《低层冷弯薄壁型钢房屋建筑技术规程》(JGJ 227—2011)规定限值,尤其是当长细比达到172.9时,侧向位移值更难得到保证,而填充轻质耐压材料后可有效限制其侧向位移发展,构成柱的第二道抗破坏防线。填充材料后的柱,其稳定承载力明显提高;柱长细比越大,承载力提高越明显。
The axial compression tests of 36 cold-formed thin-walled long-legged square steel tubular columns were carried out in 4 groups. Considering the slenderness ratio and two different parameters of different filling materials, the failure modes and bearing capacity of the specimens were obtained. The results show that the instability of the hollow steel tubular columns under test occurs. Due to the large thickness ratio, the local instability rapidly leads to the overall instability. However, the loading capacity of the specimens after the filling material is slowed down slowly and can continue to be carried; The lateral displacement value of the empty steel pipe can not easily meet the limit stipulated in Technical Specification for Construction of Low-rise Cold-formed Thin-walled Steel Buildings (JGJ 227-2011). Especially when the slenderness ratio reaches 172.9, the lateral displacement value is more difficult to be guaranteed. Filling light pressure material can effectively limit the development of its lateral displacement, forming the column of the second anti-destructive defense. After the column filled with filler material, its stable bearing capacity was significantly improved; the greater the slenderness ratio, the more obvious the bearing capacity increased.