高强箍筋混凝土梁受剪性能的试验研究

对12根500MPa钢筋作为箍筋的混凝土梁在集中荷载和均布荷载作用下进行了受剪性能试验研究,分析了高强箍筋混凝土梁斜截面受剪承载力及使用阶段的斜裂缝宽度.研究结果表明,此类构件的受力特征与普通钢筋混凝土受剪构件相同,其斜截面受剪承载力仍可按我国《混凝土结构设计规范》公式进行计算.与国外受剪承载力计算公式对比,我国受剪承载力设计公式在国际上尚处于较低水平,但仍是偏于安全的.受剪梁斜裂缝通过处箍筋应力能够达到屈服,为了保证正常使用阶段斜裂缝宽度满足限值要求,箍筋屈服强度的设计值不宜超过380MPa.

Experimental Research on Shear Behavior of Reinforced Concrete Beams with High-Strength Stirrup

Experimental research on 12 concrete beams with 500MPa steel bars as stirrups under concentrated and uniformly distributed load was performed. The shear behavior and diagonal crack width at service stage were analyzed. The experimental results show that concrete beams with 500MPa steel bars as stirrups show similar behavior to the beams with conventional stirrups and the formula in Code for design of concrete structures can be used to calculate its shear capacity. The shear formula in our code has lower level than other countries’, but it is still safe. Moreover, the tensile stress in stirrups across the diagonal crack can be yielded. And the design value of yield strength could not exceed 380MPa in order to meet the limits of the maximum diagonal crack width.