This paper presents an experimental study on the flexural behavior of encased flat cold formed steel sections FCFS and perforated cold formed steel sections PCFS. A full scale eleven specimens were prepared and tested till failure. One specimen without steel cold formed section tested as a control beam. Six specimens with flat steel cold formed section were tested to figure out the enhancement effect of section area and position. Finally, four specimens with a new shape of perforated steel cold formed sections were tested with different positions. Cold formed steel section height, flange width, and position are the main parameters studied and investigated. The ultimate load and vertical deflections were recorded and investigated. Also, modes of failure of the control and composite concrete beams were studied. From the experimental investigations, it has been observed that there is significant increase in ultimate load of composite beams with a perforated steel cold formed section. A significant increasing in the ultimate load was observed for specimens with perforated steel cold formed section

本文介绍了对封闭式冷弯型钢 FCFS 和穿孔冷弯型钢 PCFS 的弯曲行为的试验研究。准备了全尺寸的 11 个试样并进行测试直至失效。一个没有钢冷成型截面的试样作为控制梁进行测试。对6个扁钢冷弯截面试件进行了试验，以确定截面面积和位置的增强效果。最后，在不同位置对四个具有新形状的穿孔钢冷成型截面试样进行了测试。冷弯型钢截面高度、翼缘宽度和位置是研究和研究的主要参数。记录并研究了极限载荷和垂直挠度。此外，还研究了控制梁和复合混凝土梁的破坏模式。从实验调查来看，已经观察到具有穿孔钢冷成型截面的组合梁的极限载荷显着增加。观察到具有穿孔钢冷成型截面的试样的极限载荷显着增加