Abstract: Stresses of concrete in shear compression zone are analysed when a shear compression failure takes place in a partially prestrcssed concrete beam.A new model is proposed on the basis of Coulomb-Mohr's failure theory and static equilibrium conditions.The calculative parameters in the model are determined by a statistical analysis on lots of test data according to the model.The formula obtained for predicting the shear strength of beams can be conveniently used in designs for its simple form,wide applicability and good accuracy.

Key words: ear compression failure, failure theory, prestress, ratio of shear span, rate of distributing tendons

摘要： 本文从部分预应力砼梁发生剪压破坏时剪压区砼的应力分析入手,应用库仑-莫尔强度理论和静力平衡条件建立起抗剪强度的理论计算模式,并结合对试验结果的统计分析来确定其中的计算参数,由此得到的计算公式既形式简单便于应用,又具有广泛的适用性和较好的精度,可供设计和研究参考。

关键词: 剪压破坏, 强度理论, 预应力, 剪跨比, 配筋率