秸秆板轻钢高强泡沫混凝土剪力墙轴心受压性能研究

通过对7片秸秆板轻钢高强泡沫混凝土剪力墙（SSRC剪力墙）足尺试件的轴心受压试验，考察了其在轴心荷载作用下的受力性能、破坏模态和承载力，分析覆盖秸秆板、是否填充泡沫混凝土、泡沫混凝土强度和墙体厚度等因素对剪力墙试件轴心受压性能的影响。试验结果表明:剪力墙的破坏模态主要表现为轻钢立柱的局部屈曲和泡沫混凝土的局部压碎；与未填充泡沫混凝土墙体相比，填充A05级泡沫混凝土的竖向承载力和竖向刚度分别提高1.6倍和2.2倍，填充A07级泡沫混凝土可以提高2.2倍和3.1倍；是否覆盖秸秆板对墙体竖向承载力的影响很小；轻钢立柱截面宽度由89 mm增加到140 mm，墙体厚度由205 mm增加到256 mm，墙体竖向承载力提高了60%~70%。针对覆盖新型材料秸秆板的剪力墙受力性能和破坏模式，总结中、美两国规范及已有研究文献中的轴心受压构件承载力计算公式，提出SSRC剪力墙轴心受压承载力简化计算公式，其计算值与试验值基本一致。

STUDY OF LIGHTWEIGHT STEEL HIGH-STRENGTH FOAMED CONCRETE SHEAR WALL COVERED WITH STRAW BOARD SUBJECTED TO AXIAL LOADING

To study the mechanical property, failure mode, and bearing capacity of the SSRC shear walls under axial load, seven full-scale lightweight steel high-strength foamed concrete shear walls covered with straw boards (SSRC shear wall) were tested under axial compression. The impact of various parameters, such as whether sheathed with or without straw boards, whether pouring foamed concrete or not, foamed concrete strength and thickness of the walls, was analyzed. The test results show that the failure modes of the SSRC shear wall are mainly local buckling failure of lightweight steel stud and local crushing of foamed concrete. Compared with the specimen without pouring foamed concrete, the vertical bearing capacity and the vertical stiffness of pouring A05-grade foamed concrete specimen are increased by approximately 1.6 times and 2.2 times, respectively, while the vertical bearing capacity and the vertical stiffness of pouring A07-grade foamed concrete specimen are increased by approximately 2.2 times and 3.1 times, respectively. The test results also show that the whether sheathed with or without straw boards has little effect on their vertical bearing capacity especially for the specimens with pouring foamed concrete. Moreover, when the width of specimen changed from 205 mm to 256 mm by increasing the width of stud from 89 mm to 140 mm, the vertical bearing capacity of the specimen is increased by 60% to 70%. Finally, based on the mechanical property and the failure modes of SSRC shear walls, a simplified calculation formula for predicting the SSRC shear walls' bearing capacity under axial loading was proposed by summarizing the calculation formulas for calculating the bearing capacity of the axial compression members from the Chinese code, American code and existing research results. The calculated results agreed well with the experimental results.