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新的混凝土结构设计规范(第二次送审稿)(以下简称新规范),给出了沿截面高度均匀配置纵向钢筋的矫形、T形、I字形截面钢筋混凝土偏心受压构件的正截面强度计算的近似公式,但是,如果构件属于小偏心受压构件,则在具体计算受拉区、受压区的钢筋面积时,首先需要求解相对中和轴高度ξ的三次方程,计算十分复杂。本文讨论了沿截面高度均匀配筋的偏心受压构件的各种计算情况,推导出了便于进行配筋计算的计算公式。对于小偏心受压构件,则应用“分区降阶逼近法”来求解ξ值。文中计算公式,可供工程设计人员实际应用。
The new concrete structure design specification (second review) (hereinafter referred to as the new specification) provides the normal section strength of an orthopaedic, T-shaped, and I-shaped cross-section reinforced concrete eccentric compressive member with longitudinal reinforcement uniformly distributed along the section. The approximate formula is calculated, but if the component belongs to a small eccentric compression member, the concrete equation of the reinforcement zone and the compression zone must be calculated first. The first step is to solve the cubic equation of the height ξ of the neutral axis and the calculation is very complicated. This article discusses various calculations of eccentrically compressed members with uniform cross-section height and deduces a formula that facilitates calculation of reinforcement. For small eccentric compressive members, the “zonal reduced order approximation method” is applied to solve the enthalpy value. The calculation formula in this paper can be applied by engineering designers.