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基于8根预应力型钢超高强混凝土简支梁的抗剪承载力试验,研究了在集中荷载作用下预应力型钢超高强混凝土简支梁的正截面开裂荷载、斜截面开裂荷载、屈服荷载、极限抗剪承载力、荷载-挠度曲线特性以及梁破坏形态,分析了预应力度、配箍率、型钢腹板含钢率对梁抗剪承载力以及延性的影响规律。通过回归分析,建立了集中荷载作用下预应力型钢超高强混凝土梁抗剪承载力的计算公式,计算结果与试验结果吻合较好。
Based on the shear strength tests of 8 prestressed steel ultra-high-strength concrete beams with simple beam, the normal section cracking load, oblique section cracking load, yield load and ultimate load of prestressed steel ultra-high-strength concrete beam under concentrated load Shear capacity, load-deflection curve and beam failure mode, the influence of prestressing force, stirrup ratio and steel content of steel web on the shear strength and ductility of beam is analyzed. Through regression analysis, the formula of shear strength of prestressed steel ultra-high-strength concrete beams under concentrated load is established, and the calculated results are in good agreement with the experimental results.