冷弯薄壁斜卷边槽钢受压构件的承载力试验研究

Experimental investigation on channel columns with inclined simple edge stiffeners under compression loading

为了研究冷弯薄壁斜卷边槽钢简支柱的受压性能,对三种截面形式(卷边相对翼缘的弯起角度分别为45°、90°、135°)、三种不同长度(500mm1、250mm2、000mm)共计30根冷弯薄壁卷边槽钢简支柱进行了破坏性试验研究。研究结果表明,卷边弯起角度及荷载作用位置对试件的受压极限承载力和破坏模式影响显著。三种截面形式的试件都具有一定的屈曲后强度,其中大部分试件的破坏模式中包含有畸变屈曲模式。在偏心距相等的情况下,卷边弯起角度为45°的试件受负向偏心荷载时的受压承载力比90°和135°的试件略高;相反,受正向偏心荷载时,前者的受压承载力明显低于后两者。此外,对试验进行了有限元模拟,计算结果与试验结果吻合良好。

In order to investigate the compression behavior of pin-ended cold-formed channel columns with inclined simple edge stiffeners, a total of 30 pin-ended cold-formed channel columns with three sections（sloping lip stiffener tumed at 45°, 90°, 135° to the flange, respectively） and three different lengths（500mm, 1250mm,2000mm） were tested. It is found that inclined angle and loading position have an obvious affect on compression ultimate load-carrying capacity and failure mode. All three sections have certain postbuckling strength and failure modes of most specimens containing distortional buckling. Compression load bearing capacity of specimens with 45° inchned angle is appreciably higher than the other two types of specimens with 90° or 135° inclined angles at the same negative eccentricity, but obviously lower than the other two at the same positive eccentricity. Furthermore, tests are simulated by finite element analysis. Results from the analysis agree well with the experimental data.