GFRP筋活性粉末混凝土梁正截面抗裂度计算方法

Calculation method for cross-sectional crack resistance of reactive powder concrete beams reinforced with GFRP bars

摘要:

为研究GFRP筋活性粉末混凝土梁抗裂性能,进行8根GFRP筋活性粉末混凝土梁受弯性能试验,获得这类梁的开裂荷载试验值.参照普通钢筋混凝土梁正截面抗裂度计算方法,结合活性粉末混凝土受拉应力-应变关系,建立GFRP筋活性粉末混凝土梁正截面抗裂度计算模型,得到与配筋率成线性关系的截面抵抗矩塑性影响系数的计算公式.将按此公式计算得到的开裂荷载计算值与试验值进行对比,结果表明两者吻合良好.由此得到GFRP筋活性粉末混凝土梁正截面抗裂度计算方法.

Abstract:

To study the crack resistance of reactive powder concrete beams reinforced with GFRP bars,the experiments on flexural property of 8 reactive powder concrete beams reinforced with GFRP bars were carried out and cracking loads of this kind of beams were obtained.Refering to calculation method for cross-sectional crack resistance of steel-reinforced concrete beams,combining with tensile stress-strain relationship of reactive powder concrete,the calculation model for cross-sectional crack resistance of reactive powder concrete beams reinforced with GFRP bars were established.By the calculation and analysis,formula of plastic influence coefficient of sectional resistance moment was gained which has the linear relationship with reinforcement ratio.The calculation data of cracking loads obtained by the formula and the test data of cracking loads were contrasted and the results show that they are in good agreement.Accordingly,the calculation method for cross-sectional crack resistance of reactive powder concrete beams reinforced with GFRP bars is achieved.