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通过对12根配置高强箍筋的混凝土梁在集中荷载作用下的受剪试验,研究梁的挠度、箍筋应变、斜裂缝扩展规律及破坏形态。依据现行《水工混凝土结构设计规范》,对比分析试验梁斜截面承载力及考虑荷载长期作用的正常使用阶段斜裂缝宽度。研究结果表明,配置高强箍筋的混凝土梁斜向开裂规律和受力特征与普通钢筋混凝土梁基本相同,受剪承载力可按现行《水工混凝土结构设计规范》公式计算,且有较高安全储备。当考虑荷载长期作用,HRBF500钢筋在水工结构中抗拉强度设计值取360MPa时,斜裂缝宽度满足正常使用极限状态要求。
By the shear tests of 12 concrete beams with high strength stirrups under concentrated load, the deflection, the strain of stirrup, the propagation of oblique cracks and the failure modes are studied. Based on the current Code for Design of Hydraulic Concrete Structures, the diagonal section bearing capacity of the test beam and the width of diagonal crack in normal use considering the long-term effect of load are analyzed and compared. The results show that the diagonal cracking law and force characteristics of concrete beams with high-strength stirrups are basically the same as that of ordinary reinforced concrete beams. The shear capacity can be calculated according to the formula of “Code for design of hydraulic concrete structures” and has high safety reserve. When consider the long-term load, HRBF500 steel structure in the hydraulic structure tensile strength design value of 360MPa, the oblique crack width to meet the normal use of the limit state requirements.