腹板开孔的冷弯槽形轴压构件试验研究

腹板开孔是冷弯薄壁构件中一个较新的构造形式。孔的存在导致薄膜应力的重新分布,影响构件的屈曲特性和承载能力,使得无孔构件的分析与设计公式不再适用于开孔构件,因此有必要研究开孔构件。本文选取冷弯薄壁型钢中主要的承力构件形式卷边槽钢构件,对两端简支、腹板开单孔的中长柱进行了轴心受力性能的试验研究,对比进行了未开孔构件的试验。通过对比发现两类构件的受力特性有着明显的差异,开孔构件的承载力有所降低。将两类构件的试验结果分别与理论分析、ANSYS模拟结果进行对比和分析,讨论了两类构件受力性能及承载力不同的原因。根据不同开孔尺寸试件的试验结果可知,开孔构件的极限承载力随着开孔高度、宽度的增大而下降。

Experimental Study of Cold-Formed Lipped Channel Member with Web Perforation Subjected to Axial Compression

The web perforation is a new formation in the cold-formed thin-walled steel members.The existence of perforation affects buckling characteristic and load capacity of members and makes the design formula different with that of non-perforated members.The tests of middle long cold-formed lipped channel members with one perforation in web and non-perforated members subjected to axial compression were carried out.The two kinds of members have obvious different load-bearing characteristic and the load capacity of the perforated members is reduced.The reasons of difference in behavior of the two kinds of members are discussed through the comparison with test and ANSYS analysis.The experimental results indicate that the ultimate load decreases with increase of perforation size.