填充石膏基复合材料的冷弯型钢组合墙体轴压性能试验研究

Experimental study on axial compression performance of cold-formed steel framing walls with infilled gypsum based material

为研究填充石膏基复合材料冷弯型钢组合墙体的轴压性能,对2片无填料墙体和5片带填料的冷弯型钢组合墙体足尺试件进行轴向加载试验。研究填充材料对于冷弯型钢组合墙体的破坏模式、轴力-位移曲线、轴力-应变曲线、轴压刚度和轴压承载力的影响。试验结果表明:无填料墙体试件的破坏模式为立柱局部屈曲,并最终在立柱端部发生压溃破坏;有填料墙体试件则表现为截面强度破坏;较无填料墙体试件,有填料墙体试件的轴压承载力提高了1.88~2.99倍;当填充墙体试件的轴压荷载达到峰值时,被填料包裹的冷弯型钢立柱接近或达到屈服状态;随着填充材料强度和密度的提高,墙体试件的轴压承载力逐步提高。

In order to research axial compressive behavior of cold-formed steel（ CFS） framing walls with the infilled gypsum based material,two full scale unfilled specimens and five full scale infilled specimens are tested under axial compressive loads. Failure mode and axial load-deformation responses,axial load-strain responses,axial compressive stiffness and axial bearing capacity of the specimens are investigated. Experimental results show that the unfilled specimens fail in the mode of local buckling and eventual crushing at stud ends,the infilled walls lost their bearing capacity in the limit state of strength failure in cross-sections. Compared with the unfilled walls,the maximum loads of the infilled walls are significantly increased by 1. 88 - 2. 99 times. When the axial loads of the infilled walls reached their maximum values,the encased wall studs are in or close to yield states. With the increase of compressive strength and density of the infilled gypsum,the axial bearing capacity of the walls accordingly increases.