轻钢-尾砂微晶发泡板组合墙受压性能试验

Experiment on the compression performance of composite wall of cold-formed steel and tailing microcrystalline foam glass slab

摘要:

研发了一种用于装配式低层住宅的轻钢-尾砂微晶发泡板组合墙,它由轻钢龙骨和抗火及保温性能均好的尾砂微晶发泡板组合而成,在组合墙轻钢龙骨间还可填充粉煤灰砌块,以提升组合墙的保温和受力性能。为研究该组合墙受压性能,进行了4个轻钢-尾砂微晶发泡板组合墙受压试验,研究了轻钢龙骨壁厚、尾砂微晶发泡板强度、有无粉煤灰砌块,对组合墙破坏特征、承载力及变形能力的影响。进行了有限元数值模拟,分析了不同参数对组合墙承载力与破坏特征的影响规律,计算结果与试验符合较好。研究表明:加载前期组合墙为轴心受压状态,加载后期呈偏心受压状态；试件达到极限荷载时,轻钢龙骨局部出现屈曲破坏；轻钢龙骨厚度对组合墙承载力影响较大,增加轻钢龙骨厚度可明显提高组合墙的稳定性；增大尾砂微晶发泡板强度可提高组合墙抗压性能； 组合墙轻钢龙骨间填充粉煤灰砌块后, 粉煤灰砌块与轻钢龙骨及尾砂微晶发泡板具有良好的共同工作性能, 可显著提高组合墙受压性能。建议工程中宜应用组合墙轻钢龙骨间填充粉煤灰砌块的截面构造形式.

Abstract:

To improve fire resistance and thermal insulation performance of composite wall, composite wall of cold-formed steel and tailing microcrystalline foam glass slab (CFS-TS composite wall) was proposed, which was composed of cold-formed steel and tailing microcrystalline foam glass slab (TMFGS). CFS-TS composite wall can fill fly ash blocks between cold-formed steel keels to improve its thermal insulation and mechanical performance. To study the compression performance of CFS-TS composite wall, compressive tests of 4 composite walls were carried out to investigate the influences of the thickness of cold-formed steel, the strength of TMFGS, and the addition of fly ash block on the failure characteristics, bearing capacity, and deformation capacity of specimens. Finite element numerical simulation was conducted to clarify the influence of different parameters on the bearing capacity and failure mode of the composite walls. Simulation results had good agreement with the experimental results. The research shows that CFS-TS composite wall was under axial compression at the early stage of loading and under eccentric compression at the later stage of loading. When the specimen reached the ultimate load, buckling failure occured in the cold-formed steel. The thickness of the cold-formed steel has a great influence on the bearing capacity of the specimen. Increasing the thickness of the cold-formed steel can improve the stability of the specimen. Increasing the strength of the TMFGS can slow down the damage and improve the bearing capacity of the composite wall. When specimen was added with fly ash block, cold-formed steel, TMFGS, and fly ash block had good working performance with each other, and the compressive performance of the specimen was significantly improved.The section form of filling fly ash block is suggested to be used in the engineering application of CFS-TS composite wall.