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EXPERIMENTS ON SHEAR BEHAVIOR OF PRESTRESSED CONCRETE BEAMS:ANGLES OF PRESTRESSING TENDONS(θ GROUP)
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摘要: 对3根PC梁和1根RC对比梁的受剪性能进行试验研究,剪跨比均为2.2,主要以曲线筋角度为研究变量。研究表明:正常配筋率的小剪跨比PC梁易发生弯剪破坏;角度越大,对抗剪越不利,梁刚度损伤也相应越大。此外,采用基于截面的抗剪设计方法和拉压杆模型(MSTM)对受剪承载力进行了预测,与试验值对比表明:基于截面的抗剪设计公式不适用,而MSTM预测结果最为精确,且随着角度的变化趋势与试验结果一致。Abstract: Three PC beams with draped tendons and one RC beam were tested and the primary variable is the angle of the tendons,.All the beams had a shear span to depth ratio,a/h_0,of 2.2.Several results were obtained: beams with both small a/h_0 and normal amount of were inclined to fail in a flexural-shear mode;the greater the ,the faster of the damage of beams.Besides,sectional design methods and modified strut-and-tie model(MSTM) were used to predict the beam shear strengths,and comparisons with test results indicate that sectional methods are not suitable for such predictions but MSTM not only gives accurate results,but also well account for the effect of the angle of the draped tendons.
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