弯起预筋PPC T梁疲劳抗剪性能的研究

STUDY ON FATIGUE SHEAR BEHAVIOR OF PPC T-BEAMS WITH BENT-UP TENDON

本文分析比较4片弯起预筋和13片直线预筋PPC T梁疲劳抗剪试验结果,提出了具有弯起预筋T梁斜截面疲劳开裂剪力的计算公式,计算值与试验值基本符合。并对以主拉应力准则或以斜截面疲劳开裂剪力折减系数两种计算斜裂面开裂剪力的表达式进行了分析。试验证明,弯起预筋T梁比直线预筋的抗剪强度有所提高,可偏安全地采用直线预筋T梁计算公式进行预测。

The paper analyses and compares the results of fatigueshear tests on 4 PPC T-beams with bent-up tendons and 13 wish staighttendons, gives a formula of predicting the fatigue cracking shear ondiagonal of PPC T-beam with bent-up tendons. The calculation resultsis well in conformity with the test ones. It makes the analysis with twoexpressions to calculate the fatigue cracking shear on diagonal: principaltensile stress criterion and diasgonal fatique cracking shear reductioncoefficient. The results prove that ...