活性粉末混凝土梁斜裂缝宽度影响参数探析

为了分析剪跨比、配箍率、钢纤维体积率和纵筋率等不同参数对试验梁斜裂缝宽度的影响,进行4组11根HRB500级钢筋活性粉末混凝土简支梁的抗剪试验研究,并提出其最大斜裂缝宽度计算的建议公式。研究结果表明:剪跨比、钢纤维体积率、配箍率和纵筋率都对试验梁的斜裂缝宽度有一定的影响,剪跨比越小,试验梁的斜裂缝宽度越小;配箍率、钢纤维含量和纵筋率越大,试验梁的斜裂缝宽度越小;其中钢纤维体积率的影响最为明显。基于普通钢筋混凝土梁斜裂缝宽度计算公式构建的修正公式,可为HRB500级钢筋活性粉末混凝土简支梁的抗剪计算提供些许参考。

Research on Parameters Influencing Crack Width of Reactive Powder Concrete Beam

In order to analyze the influence of different parameters,such as shear span ratio,stirrup ratio,steel fiber volume ratio and longitudinal reinforcement ratio on the shear crack width of the test beam,shear tests of 4 groups of 11 HRB500 grade reinforced concrete simply supported beams are studied,and the proposed formula for calculating the width of the maximum shear crack is put forward.The research results show that shear span ratio,stirrup ratio,steel fiber volume ratio and longitudinal reinforcement ratio all have certain effects on the shear crack width of the beam. The smaller the shear span ratio,the smaller the shear crack width of the test beam. The bigger the stirrup ratio,steel fiber volume ratio and longitudinal reinforcement ratio,the smaller the shear crack width of the test beam. The effect of steel fiber volume fraction is especially obvious. The modified formula based on the calculation formula for the shear crack width of ordinary reinforced concrete beam may provide some references for the shear calculation of HRB500 Grade Reinforced reactive powder concrete simply supported beam.