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设计中,当遇到混凝土截面高度受到建筑高度的限制时,常需在受压区布置钢筋,以承受单筋梁所不能负担的多余弯矩。有关这种双筋矩形截面的设计,教科书中都是用将外力矩分成两部分的方法去解决的。本文,采用和教科书中相同的假定,用混凝土应力和钢筋应力分布的比例关系,直接导出设计所需的受压钢筋和受拉钢筋面积的计算公式。(编者注:本文所用方法仅适用于容许应力阶段。)
Design, when confronted with the height of the concrete cross-section height limit, often in the compression zone layout of steel to withstand the single beam can not afford the excess bending moment. The design of this double-bar rectangular cross-section, the textbook is to use external torque is divided into two parts to solve the problem. In this paper, using the same assumptions in the textbook, we derive directly the formulas for calculating the area of the compression bar and tension bar required by the design, using the proportional relationship between the concrete stress and the stress distribution of the bar. (Editor’s Note: The method used in this article applies only to the allowable stress phase.)