中文摘要：

为研究超高性能混凝土梁的开裂剪力和斜裂缝宽度,进行了9根超高性能混凝土T形简支梁的抗剪性能试验,试验变化参数包括剪跨比、配箍率和预应力度,观察了试验梁的抗剪开裂弯矩和斜裂缝发展。试验结果表明：随剪跨比增大,梁开裂剪力降低,斜裂缝宽度增速较快;施加预应力可提高开裂剪力并延缓斜裂缝发展速度;增大配箍率对开裂剪力影响不大,但可以延缓斜裂缝发展速度。基于试验结果给出了超高性能混凝土梁开裂剪力和正常使用状态下最大斜裂缝宽度的建议公式,建议公式的计算值和试验值吻合良好。

英文摘要：

To investigate how to calculate ultra-high performance concrete beams shear cracking load and diagonal crack width, nine ultra-high performance concrete T-beams were tested in shear, the test variables included shear span-to-depth ratio, stirrup ratio and level of prestress,and the developing of diagonal cracks were observed. The tests results show that the shear cracking load reduces and the diagonal cracks width growth is rapid with increase of shear span-to-depth ratio; prestress can improve the shear cracking load and delaying the development of diagonal cracks width ; increasing stirrup ratio has little effect on the shear cracking load, but can delay the diagonal cracks growth speed. Formulas are suggested to calculate the shear cracking load and the maximum diagonal crack width in serviceability states,and the calculated values by the suggested formulas agree well with the test results.