冷弯型钢组合墙体抗侧刚度研究

对组合墙体抵抗水平剪力的变形特征进行了分析研究。首先将组合墙体的墙面板简化成斜向拉杆,采用等代拉杆法提出了组合墙体在弹性阶段的抗侧刚度计算公式及建议;其次通过对已有的单面石膏板、单面定向刨花板(OSB板)、一面石膏板另一面OSB板三类组合墙体抗剪试验结果的比较分析,验证了组合墙体抗侧刚度简化计算公式的正确性;最后在推导出的组合墙体抗侧刚度计算公式的基础上,分析了组合墙体高宽比、自攻螺钉间距以及墙面板厚度对组合墙体抗侧刚度的影响。研究结果表明:随着组合墙体高宽比的减小、边缘自攻螺钉加密、墙面板厚度的增加,组合墙体的抗侧刚度明显增加;组合墙体抗侧刚度计算公式计算结果安全合理,计算过程简单实用,可供实际工程设计参考。

Research on Lateral Stiffness of Cold formed Steel Composite Wall

The deformation behavior of composite wall to resist horizontal load is analyzed in this paper.The design suggestions and formulas for calculating lateral stiffness of such composite wall under static loadings are proposed by using the method of equivalent brace.The study shows that a simplified method is appropriate for this case,because the deformation of walls obtained by using this method is close to that of former tests on three kinds of walls,including walls with single-gypsum board,walls with single-oriented strand board(OSB),and walls with gypsum sheathing on the back and OSB sheathing on the front.Furthermore,a detailed parametric study based on the formulas is carried out.Study results indicate that with the decrease of the height-to-width ratio of the wall,the screw spacing in the edge of wall,and the thickness of the sheathing,the wall's lateral stiffness increases obviously.The formulas for determination of lateral stiffness of composite wall in this paper are safe and simple to use and can serve as reference for engineering design.