轻质脱硫石膏改性材料填充冷弯型钢组合墙体抗震性能试验研究

为研究轻质脱硫石膏改性材料填充冷弯型钢组合墙体的抗震性能，对5片轻质脱硫石膏改性材料填充冷弯型钢组合墙体的足尺试件进行低周反复加载试验。研究该类墙体的破坏机理、承载力及抗侧刚度、滞回性能、延性及变形、耗能性能等。试验结果表明：填充墙体内填石膏分块形成斜向受压带，发挥其抗侧力功能，最终以各块填充物与墙架立柱之间的黏结滑移破坏以及轻质石膏块角部的受压破坏为主要破坏特征；较空腔墙体，填充墙体的受剪承载力和抗侧刚度均有大幅度提高，受剪承载力提高了55%~88%，抗侧刚度提高了142%~217%；随着填充材料强度的提高，墙体的抗侧刚度和受剪承载力逐步提高，但其提高幅度低于材料强度的提高幅度。

Experimental study on seismic behavior of cold-formed steel framing walls infilled with lightweight modified FGD gypsum

In order to investigate the seismic behavior of cold-formed steel (CFS) framing walls infilled with the lightweight modified flue gas desulfurization (FGD) gypsum, five full scale specimens were tested under reversed cyclic horizontal load. The failure mode, shearing capacity, lateral stiffness, hysteretic behavior, ductility and deformation and energy dissipation were investigated. Experimental results show that the infilled gypsum behaves as a diagonal compressive bracing to resist the horizontal force. The failure modes of the walls with infilled gypsum are characterized by the bond-slip cracks between infilled gypsum and wall frames, and the compressive damage at the corners of the individual part of infilled gypsum. Compared with the unfilled specimens, the shear capacity and lateral stiffness of the infilled specimens increase by 55%~88% and 142%~217%, respectively. It is noted that the shear capacity of the walls increases with the compressive strength of gypsum. However, the increase in shear capacity is lower than the increase in the compressive strength of gypsum.