轻钢龙骨-泡沫混凝土复合墙板的抗冲击性能

为了对轻钢龙骨-泡沫混凝土复合墙板的抗冲击性能进行定量表征和破坏形式进行定性描述,评价复合墙板抗冲击性能的优劣,利用质量为2 040 g的钢球分别从1.0 m、1.5 m、2.0 m和2.5 m的高度自由落体冲击复合墙板,同时辅以全幅高达2 000帧/s的超高速相机拍摄试验过程,研究了不同结构的轻钢龙骨-泡沫混凝土复合墙板的抗冲击性能。结果表明,采用钢丝网、纤维、玻璃纤维网格布三种增强方式可以提升轻钢龙骨-泡沫混凝土复合墙板的抗冲击性能,三种复合墙板分别在冲击高度为2.0 m、2.0 m和2.5 m时出现裂缝,吸能比例的最大值分别为97.80%、96.70%和96.57%,玻璃纤维网格布增强方式的轻钢龙骨-泡沫混凝土复合墙板具有更好的抗冲击性能;轻钢龙骨-泡沫混凝土复合墙板表面不同位置处抗冲击性能具有差异性,非龙骨区域的吸能比例和硅酸钙板吸收能量小于龙骨区域,具有更好的抗冲击性能。

Impact Resistance of Lightweight Steel-Framed Foamed Concrete Composite Wall Panels

The impact resistance and failure modes were assessed by impacting composite wall panels with a 2040 g steel ball from heights of 1.0 m,1.5 m,2.0 m and 2.5 m,respectively.While the test was being conducted,an ultra-high-speed camera recording 2000 frames per second was used to provide footage.The impact resistance of lightweight steel-framed foamed concrete composite wall panels of different structures was evaluated.The results show that reinforcement methods such as steel wire mesh,fiber and fiberglass mesh enhance the impact resistance of lightweight steel-framed foamed concrete composite wall panels.The cracks appear in the three of composite wall panels when the impact height is 2.0 m,2.0 m and 2.5 m,and the energy absorption ratio is 97.80%,96.70%and 96.57%,respectively.The lightweight steel-framed foamed concrete composite wall panels reinforced with fiberglass mesh provide better impact resistance.The lightweight steel-framed foamed concrete composite wall panels exhibit different levels of impact resistance according to their position on the surface.Compared to lightweight steel-framed area,the non-lightweight steel-framed area and the calcium silicate board have lower energy absorption ratios,which have better impact resistance.