高强轻骨料混凝土梁受剪性能分析

高强轻骨料混凝土具有强度高、自重轻、抗冻抗渗性能好等诸多优点，具有良好的应用前景，但其弹性模量低，脆性破坏显著。收集了大量轻骨料混凝土梁受剪性能试验结果，通过LC40强度等级将其分为普通强度轻骨料混凝土梁和高强轻骨料混凝土梁，结合各国规范建议方法和典型统计模型对其承载能力进行计算，并与试验结果进行对比分析。研究表明：轻骨料混凝土梁的受剪承载力低于同等级的普通混凝土梁，且随着混凝土强度的提高，轻骨料混凝土梁的受剪承载能力提高幅度减小，建议依据强度差异选取不同的混凝土强度折减系数用于规范设计。

Shear behavior of high-strength lightweight aggregate concrete beams

High-strength lightweight aggregate concrete (HSLAC) with high-strength, light-weight and good frost resisting property and impermeability has the better application prospect, but its low modulus leads to brittle failure. A large number of domestic and abroad shear test data of lightweight aggregate concrete beams were collected, and through the strength grade LC40 divided the test specimens into the normal strength lightweight aggregate concrete (LAC) beams and HSLAC beams. The paper combined the national specification recommended method with the typical statistical model to calculate the carrying capacity of beams, and also presents their comparison with experiment results. Research shows that the shear bearing capacity of LAC beams is lower than the normal weight concrete beams with same strength level, and the increased range of shear bearing capacity of LAC beams is decreased with the increase of concrete strength. The reasonable reduced concrete strength coefficients should be proposed to be used in the design specification according to the different intensity.