预应力型钢超高强混凝土梁抗剪承载力试验研究

Experimental investigation on shear bearing capacity of prestressed steel reinforced ultra-high-strength concrete beams

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 bearing capacity experiment of 8 prestressed steel reinforced ultra-high-strength concrete simply supported beams, the normal section crack load, the inclined section crack load, yield load, ultimate shear bearing capacity, characteristics of load-deflection curves and failure patterns of the beams under concentrated loads were analyzed. The effects of prestress degree, stirrup ratio and steel ratio of steel web on the shear bearing capacity and ductility were also thoroughly researched through the experiment. The calculation equation of the shear bearing capacity of such beams under concentrated loads was obtained by regression, and the calculation results agree well with the test conclusions.