细晶高强钢筋混凝土梁受剪性能试验研究

细晶高强钢筋是我国冶金行业研究开发的新型热轧带肋钢筋,其抗拉屈服强度标准值达500MPa以上。通过9根纵筋及箍筋均采用细晶高强钢筋的混凝土梁的受剪试验,分析其受力特点、破坏形态以及影响受剪承载力的主要因素。结果表明,细晶高强钢筋混凝土梁的受剪性能与普通低合金热轧带肋钢筋混凝土梁基本相同,其受剪承载力仍可按现行GB 50010-2002《混凝土结构设计规范》规定的公式计算,取箍筋抗拉强度设计值fyv=360 MPa,有足够的安全储备,为细晶高强钢筋的工程应用提供了依据。

EXPERIMENTAL STUDY ON SHEAR BEHAVIOR OF CONCRETE BEAMS REINFORCED BY HOT ROLLED RIBBED BARS OF FINE GRAINS

Hot-rolled ribbed bars of fine grains are a new type of steel bars whose characteristic value of yielding strength is 500 MPa.Based on the test results of 9 concrete beams reinforced by hot-rolled ribbed bars of fine grains under shear,the shear behavior,the shear failure modes and the main factors affecting the shear capacity of the beams are analyzed.The results show that the shear behavior of concrete beams reinforced by the hot-rolled ribbed bars of fine grains are almost the same as the beams reinforced by common low alloy-steel hot-rolled ribbed bars,the shear bearing capacity of the beams can be calculated by the formulas in curent Code for design of concrete structures(GB50010),and the design value of tensile strength of stirrups for the new ribbed steel bars can be taken as fyv = 360 MPa,the calculated results are in safe side.This proposal may be as a reference for the applications of hot rolled ribbed bars of fine grains in projects.