钢筋混凝土T形纯扭构件强度计算及可靠度分析

CALCULATION OF ULTIMATE STRENGTH OF REINFORCED CONCRETE T-BEAM UNDER TORSION AND ANALYSIS OF THE RELIABILITY

本文根据实验和理论分析,提出将T形纯扭构件分成腹板和翼缘两个相互交叉的矩形截面的计算模型,并用它对T形构件出裂后工作性能进行了全过程分析。电子计算机运算结果与52个试验结果符合。运用同样方法,对L形及I形纯扭构件进行分析,亦获得较满意的结果。文中还阐述了翼缘挑出长度对T形构件极限扭矩的影响。最后提出了T形构件抗扭强度实用计算公式,并进行了可靠度分析。

In this paper, based on the experimental and theoretical studies, an analytical model is presented that is capable of predicting the torsional behavior of R. C. T-Beam subjected to torsion. On this model, using the diagonal compression field theory, the complete response process of such member is deduced by the aid of computer. The comparison between theoritical values and experimental results shows a good agreement. Moreover, the torsional behaviors of R. C. L—Beam and I-Beam were analysed with the same method, and it was proved the method is suitable to these members. Finally, a recommendation for the besign of R. C. T-Beams to resist torsion is proposed, and the reliabity of the formula was analysed.