无粘结部分预应力砼梁斜截面抗剪强度的试验研究

Experimental Research on Ultimate Shear Strength of Partially Prestressed Concrete Beams With Unbonded Tendons

本文根据25根无粘结部分预应力砼梁中17根直筋梁的试验资料,分析讨论了预应力度、剪跨比及配箍率等对无粘结部分预应力砼梁抗剪强度的影响,在统计分析的基础上提出了相应的计算公式。公式概念清晰,精度可以满足使用要求。最后还将建议公式与有粘结预应力砼梁抗剪公式进行比较。

This paper studies the effects of the prestress degree, the ratio of shear span to depth and the ratio of stirrup on the ultimate shear strength of the unbonded P.P. C. beams. The results of static loading data of 17 P.P. C. beams with unbonded tendons (straight tendon beams) are analyzed and an empirical formula is proposed. The results of this paper show that the propdsed ultimate shear strength is reasonable. Finally, our formula is compared with that of the P.P.C. beams with bonded tendons