Z形截面钢筋混凝土偏压柱的简化设计方法

Design Procedure of the Z-shaped Cross Section R.C.Columns Under Eccentric Compression

通过对Z形截面偏压柱及中长柱的计算机理论分析 ,探讨了在不同轴压比下Z形截面柱Mx-My 关系以及荷载角与截面中和轴之间的关系。研究了在不同荷载角、长细比以及相对偏心距时 ,偏压柱的基本变形规律 ,提出了用偏心距增大系数来进行设计的方法 ,并给出了偏心距增大系数的计算公式。与方形柱的对比表明 ,Z形柱截面高宽比为 1 0～ 1 3时受力较为合理。

Based on the computer theoretical analysis for short and slender Z-shaped R C columns, the M x-M y relationships of columns for different compression ratios as well as the relationships between loading angles and neutral axis angles of cross section are investigated. The general behaviors of columns for different loading angles and slenderness ratios, eccentricity ratios are studied. A design procedure using the eccentricity magnification factor is proposed, and the formula of eccentricity magnification factor is given. It is shown by the comparison between the square columns and Z-shaped columns that the rational ratio of height and width for Z-shaped columns is 1.0～1.3.