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目的研究钢纤维水泥砂浆(SFCM)钢筋网加固法加固RC方柱的力学性能以及影响因素.方法对4根RC方柱采用钢纤维水泥砂浆钢筋网进行加固,在5 000 kN反力架上进行轴心抗压一次受力试验,并与另外2根未加固柱试验结果进行对比.结果 SFCM钢筋网加固法能大幅提高钢筋混凝土柱的极限承载能力、峰值应变、开裂荷载、延性,其中轴心抗压极限承载力提高幅度最小为53%,最大为103%;有效改善被加固柱裂缝的分布形态及破坏形态,使裂缝由不加固的疏而宽变得密而细.结论 SFCM钢筋网加固法可大幅提高构件的极限承载力,改善构件延性,约束构件裂缝发展;给出了受压承载力计算方法,利用该方法所得计算值与试验结果吻合较好.
Aim To study the mechanical properties and influencing factors of reinforced RC square columns strengthened with steel fiber reinforced cement mortar (SFCM) reinforcement mesh.Methods Four RC columns were reinforced with steel fiber reinforced cement mortar mesh, and were carried out on a 5 000 kN reaction frame Axial compressive stress test, and compared with the other two non-reinforced column test results.Results SFCM reinforcement mesh method can greatly improve the ultimate bearing capacity of reinforced concrete columns, peak strain, cracking load, ductility, of which the axis The minimum increase of compressive ultimate bearing capacity is 53% and the maximum is 103%, which can effectively improve the distribution and failure mode of cracks in reinforced columns, making the cracks dense and thin from non-reinforced sparse and widened. The method can greatly improve the ultimate bearing capacity of members, improve the ductility of members and the development of cracks in the restraining members. The calculation method of compressive bearing capacity is given. The calculated values obtained by this method are in good agreement with the experimental ones.