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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θ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θ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。
The shear performance of three PC beams and one RC RC beam were studied. The shear span ratio was 2.2, and the angle θ was the main research variable. The results show that the small shear span with normal reinforcement ratio is more prone to bending and shear failure than PC beam. The larger the angle θ is, the worse the shear resistance is and the greater the stiffness of beam is. In addition, the shear capacity was predicted by using the shear-based design method and MSTM. Comparing with the experimental data, the shear-resistant design formula based on the cross-section is not applicable, and the MSTM prediction is the most accurate, And with the changing trend of angle consistent with the test results.