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本文通过对作者所做10根预应力T形梁的试验分析及对国内外有关试验数据的分析,认为预应力对受扭构件极限扭矩的提高作用与混凝土的强度等级成正比,并可较好地用预应力系数r=2.5(1+10σ/f’_0)~(1/2)-1.5来表示,据此对《混凝土结构设计规范》(GBJ10—89)中预应力受扭构件极限扭矩的计算方法提出了修改建议公式。计算结果与试验值的比较表明,本文提出的计算方法具有较高的精度。
Based on the experimental analysis of the ten prestressed T-beams made by the author and the analysis of relevant test data at home and abroad, this paper concludes that the effect of prestressing on the torsion member’s ultimate torque is proportional to the strength grade of the concrete and can be better. It is represented by the prestress coefficient r=2.5(1+10σ/f’_0)~(1/2)-1.5. According to this, the torque limit of the prestressed torsion member in GBJ10-89 “Code for Design of Concrete Structures” (GBJ 10-89) is expressed. The calculation method proposes to modify the proposed formula. The comparison between the calculation results and the experimental values shows that the calculation method proposed in this paper has a higher accuracy.