预应力混凝土构件抗扭承载力理论计算方法

A Theoretical Calculating Method for Ultimate Torsional Strength of Prestressed Concrete Beams

根据修正斜压场理论和软化混凝土的本构关系，在考虑弯剪扭共同作用综合效应的基础上，对矩形截面预应力混凝土构件，在弯剪扭复合受力作用下的抗扭极限承载力计算方法进行了研究。提出的理论计算公式不仅理论基础强、概念清晰、简洁易行，而且与所验证的３２根模型构件的试验结果符合良好。

Based on the modified diagonal compression field theory and the softening characteristics of diagonally cracked concrete,in which the relation among bending,shear and torsion is taken into consideration,a calculating method for ultimate torsional strength of the rectangular prestressed concrete beams in combined bending,shear and torsion has been studied.The calculating formulas that are presented not only have very strong theoretical base with a clear concept and are easy to apply,but also are compared with the experimental results of the thirty two prestressed concrete members and the comparisons show a good agreement.