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本文通过七组共21根具有不同剪跨比,不同箍筋间距的薄腹T形梁的试验,较系统地研究了在多次重复荷载作用下,混凝土的抗剪作用,并用统计的方法分析了各个主要因素对Q_h~p的影响;分析了箍筋的应力分布,受力过程及初应力大小,分析了斜截面强度的疲劳系数及斜裂缝宽度的控制值等,在这基础上提出了斜截面疲劳强度的计算公式及计算表格,也提出了斜裂缝控制的初步设想。
In this paper, 21 sets of 21 thin-convex T-beams with different shear span ratios and different stirrup spacings are tested in a systematic study of the shear resistance of concrete under multiple repeated loads and analyzed by statistical methods. The influence of each major factor on Q_h~p was analyzed; the stress distribution of the stirrup, the stress process and the magnitude of the initial stress were analyzed, and the fatigue coefficient of the oblique section strength and the control value of the width of the oblique crack were analyzed. Based on this, the The calculation formula for the fatigue strength of the inclined section and the calculation table also proposes the preliminary idea of oblique crack control.