Abstract: In this Paper,We Study the Property of unbonded P.P.C.beams on the basis of the test that includes 17 straight tendon unbonded P.P.C.beams and 8 curved tendon beams.From the test and study,we give the distributing Pattern of the limit strength of the curved unbonded tendons and the calculating formula of shear strength of P.P.C.beams with curved tendons.The formula in this paper could be used to calculate shear strength of unbonded P.P.C.beams with both straight and curved tendons.In this paper,the revsults of test and calculation are compared and they all coincide very well with each other.The results of this paper could be used asa a basis of theoretical experiment and practical engineering design.

Key words: unbonded, inclined section, curved tendon, shear strength prestress

摘要： 本文在17根直线配筋无粘结部分预应力砼梁(下文简称无粘结PPC梁)试验研究的基础上,通过8根曲线配筋无粘结PPC梁的试验研究分析。找出了曲线型无粘结预应力筋束的极限应力分布规律,提出了曲线型无粘结PPC梁抗剪强度的计算公式。本文的计算公式可适用于无粘结PPC直线型及曲线型配筋的梁。最后我们把建议公式与试验结果进行了比较,其吻合程度良好,本文结果可为今后这方面的研究提供试验依据及无粘结PPC梁的设计提供参考。

关键词: 无粘结, 斜截面, 曲线配筋, 抗剪强度, 预应力