轻钢龙骨-铝蜂窝夹层板复合墙板抗弯性能

Bending performance of light steel keel-aluminum honeycomb sandwich panel composite wallboard

设计一种将铝蜂窝夹层板作为覆面板的新型轻钢龙骨复合墙板,分别对两种不同厚度(160和240 mm)的轻钢龙骨铝蜂窝夹层板复合墙板进行抗弯试验,对复合墙板在受弯条件下的整体工作性能、破坏特征、屈服承载力等进行研究,并提出复合墙板的力学模型和屈服承载力的理论计算方法。结果表明:复合墙板具有良好的抗弯承载力和延性变形性能,且两种厚度的复合墙板表现出不同的破坏模式。厚度为160 mm的复合墙板发生了纵向龙骨翼缘的拉断破坏,从而导致整个墙板在跨中发生受弯断裂破坏;厚度为240 mm的复合墙板由于纵向龙骨腹板的高厚比较大,发生了腹板局部屈曲破坏,最终导致该墙板的抗弯承载力小于厚度为160 mm的复合墙板的承载力。基于对复合墙板破坏过程的力学分析,建立其力学模型,并进行屈服承载力计算,计算值与试验值吻合较好。

A new type of light steel keel composite wall panel with aluminum honeycomb sandwich panel as composite panel was designed.The bending tests were conducted for two different thicknesses(160 and 240 mm)of the panels.By studying their overall working performance,failure characteristics and yield bearing capacity,the mechanical model and theoretical calculation method were proposed.Results showed that the composite wallboard had good flexural capacity and ductility deformation performance.The two thickness composite wallboard showed different failure modes.Tensile failure along longitudinal keel flange happened in the composite wall panel with thickness of 160 mm,which led to the bending failure of the whole panel in middle span.Local buckling failure occurred on the wall panel with thickness of 240 mm due to the large height-thickness ratio of longitudinal keel webs.Its flexural capacity was lower than that of 160 mm thick wall panel because of its lower the stress level of the tensile flange.Based on the mechanical analysis of the failure process,the mechanical model was established and the yield bearing capacity was calculated.Calculation results agreed well with experimental results.