复合加固钢筋混凝土梁抗弯性能试验

Experiments on the bending performance of composite reinforced concrete beam

对7根钢筋混凝土梁拉区粘贴CFRP,压区粘贴角钢,分析不同加固量和不同加固历史对钢筋混凝土梁抗弯性能的影响;绘制受拉钢筋、CFRP的应力-应变曲线及荷载-挠度曲线。结果表明:CFRP与角钢加固的试验梁极限承载力提高明显,同时,外部加固材料可有效延迟或抑制试件裂缝的开展;对持荷加固和卸荷加固的钢筋混凝土梁,加固材料存在不同程度的应变滞后,且卸荷加固梁的CFRP、角钢利用率明显优于不卸荷加固梁;试验得到的极限承载力计算结果与试验值吻合较好。

The effect of different reinforcement quantities and strengthening history on the bending performance of concrete beam was analyzed by pasting CFRP in the tension zone and anglesteel in the compressive zone of 7 reinforced concrete beams.The stress-strain curves and the load deflection curves of the steel and the CFRP were obtained.The results show that the ultimate bearing capacity of test beams reinforced by CFRP and angle steel increases significantly,and external reinforcement material can effectively delay or inhibit the development of cracks.For the loading and unloading reinforcement of reinforced concrete beams,there are varying degrees of strain hysteresis in reinforcement materials.And the utilization rate of the CFRP and the angle steel on the unloading reinforced beams is better than that on the no-unloading reinforcement beam.Calculation results of ultimate bearing capacity obtained by experiment agree well with the test values.