钢筋砼T形、倒T形、工字形截面偏心受压构件的配筋计算

本文基于新的砼结构设计规范的基本假定和截面内力平衡方程,提出了在T形、倒T形、工字形截面偏心受压构件正截面强度计算时均可按矩形截面计算的“等代矩形截面法”,从而使T形,倒T形、工字形截面偏心受压构件的各种计算情况分析以及小偏心受压时遇到的中和轴相对高度ξ三次方程的近似计算方法均与矩形截面通用。在近似求解小偏心受压构件的ξ的三次方程时,以分区降阶一次逼近法为例,说明了“等代矩形截面法”的具体应用。

Calculation of Reinforcements of RC Members with T, Inverted T or I Section under Eccentric Compression

Based on the fundamental assumption used in the new Design Code of Concrete Structures and the equilibrium equations of internal forces in member sections,this paper presents an "equivalent rectangular section method" for analyzing ultimate strength in the normal sections of T, inverted T or I members subjected to eccentric compression. Ih these cases a proposed equivalent rectangular section is used for reinforced concrete members subjected to compressive load with small eccentricity. The calculation procedures of members under eccentric compression and the approximate method for solving the cubic equation of the depth of the neutral axis by reducing power in separated regions are the same as those for rectangular section given in ref. 2].