Abstract: This paper presented the test of 50 beams of partially prestressed concrete and 82 datum of the ultimate shear strength. Based on these results, the authers studied the effects of the degree of prestress and the shear span to depth ratio on the ultimate shear strength. The different degree, shear span to depth ratio and stirrup were considered. The empirical formula of ultimate shear strength was proposed. the formula given in the paper can also be used for the case of reinforced concrete and full prestressed concrete by introducing a degree of restressing. Finally, a design formula was proposed and compared with the provisions used both in China and other countri es.

摘要： 本文根据50片部分预应力混凝土静载试验梁的试验资料,着重讨论了预应力度和剪跨比对梁极限抗剪强度的影响。在分析和统计的基础上,提出了含预应力度的抗剪强度计算公式。公式具有概念清晰、形式简单的特点,精度也能满足实用要求。最后,将建议的设计公式与国内外规范进行了比较。