新型冷弯薄壁型钢墙体立柱轴压性能试验研究

提出一种在冷弯薄壁型钢骨架中放置聚苯乙烯泡沫板,并在骨架外侧喷涂轻质保温物料的新型轻质组合墙体。通过对1根无墙板的冷弯薄壁型钢立柱和2根新型冷弯薄壁型钢墙体立柱的轴压性能进行足尺试验,研究其受力过程、承载能力和破坏模式,并将试验结果与按规范公式计算的极限承载力进行对比分析。研究结果表明:无墙板立柱的破坏模式为构件的整体屈曲;新型冷弯薄壁型钢墙体立柱的破坏现象为柱顶截面的局部受压屈服,保温物料对立柱的支承作用使新型墙体立柱的承载能力显著提高。按照规范中关于轴心受压杆件的强度和稳定计算公式得出的极限承载力与试验的破坏荷载较为吻合。

EXPERIMENTAL RESEARCH ON AXIAL COMPRESSION BEHAVIOR OF NEW-TYPE OF COLD-FORMED THIN-WALL STEEL FRAMING WALL STUDS

A new-type of light-weight wall,in which polystyrene foam plates are placed inside the cold-formed thinwall steel frame and light thermal insulation material is sprayed outside the frame of the wall,was presented. Through the full-scale tests of one cold-formed thin-wall steel stud without sheathing and two new-type of cold-formed thin-wall steel framing wall studs under axial loading,the failure process,the bearing capacity and the failure mode were analyzed. The calculated value determined by the code and experimental data of this test were compared. The results show that the failure mode of the cold-formed thin-wall steel stud without sheathing is global buckling and that of the new-type of wall stud is local compressed yielding on the top of the stud. The bearing capacity of the new-type of wall stud is greatly increased owing to the support of thermal insulation material. The calculated values of the ultimate bearing capacity by the formula of calculating about strength and stability of axial compressive members in the code agree well with the experimental ultimate bearing loadings.