混凝土异形柱代换为矩形柱配筋方法研究

Study on Reinforcement Method of Special-Shaped Concrete Columns Replaced by Corresponding Rectangular Columns

摘要: 混凝土框架、框剪和框筒结构设计中，为满足建筑外观与局部构造要求，经常选用异形截面柱。目前结构设计软件虽可积分解出常见异形柱的组合内力，但随后将其异形截面分解为多个相互叠加的独立单元，分别统一按矩形截面计算配筋，不完全符合异形柱的全截面协调变形工作机理；各分解单元的重叠部分重复计算配筋，导致现有异形柱计算配筋存在较大不确定性；整体结构建模时，难免仍有部分复杂异形柱的截面信息难以输入。为此提出了任意截面异形柱代换为矩形柱的配筋方法，推导了代换矩形边长统一计算式，列出了常用代换矩形边长解析式，进行了相应分析与说明，并给出了实用设计建议，可作为补充方法供混凝土异形柱配筋设计参考。

Abstract: In structural design of reinforced concrete buildings, such as frame structures, frame with shear-wall structures or with wall-tube structures, special-shaped section columns are often chosen to meet requirements of architectural appearance and local construction. At present, although the used design software can calculate combined internal forces of most special-shaped section columns by using integral method, the output reinforcements have more uncertainty because the section is decomposed into several independent and overlying parts, in which reinforcement is calculated according to rectangular section member approximately, that is incompletely confirming with coordinate deformation mechanism on whole section of special-shaped section columns, and the reinforcement in overlapping parts of decomposed units are calculated in unreasonable repeat. Furthermore, information of few more complicated special-shaped sections is still inevitably difficult to input into structure analysis models. To ensure reinforcement accuracy of special-shaped section columns in design, the new method of reinforcement calculation for any such column is proposed in this paper, which may be substituted with equivalent rectangular section column, then the unified formula to confirm side lengths of the substitution rectangular section is deduced, and some analytic formulas to calculate side lengths of substitution rectangular sections in common use are listed with relative analysis, detail explains and practical proposals, which may be used as supplementary and reference for special-shaped concrete column in structural design.