织物增强混凝土加固RC梁的斜截面抗剪承载力试验研究

基于不同剪跨比的织物增强混凝土(TRC)加固RC梁的斜截面抗剪承载力试验,研究被加固梁的斜截面抗剪承载力及其破坏形态的变化,并研究剪跨区加固后梁的变形特点。试验结果表明,加固措施可以有效地提高梁的斜截面抗剪承载力,改善梁的斜截面破坏的脆性,对斜裂缝的发展有一定的约束作用,并减小梁在斜裂缝出现前的挠度。试验还表明,对剪跨比较大的RC梁,采用织物增强混凝土薄板加固后,其斜截面抗剪承载力提高幅度较大:当剪跨比为1时,加固后梁的斜截面极限抗剪承载力提高4%;当剪跨比为2.5时,加固后梁的斜截面极限抗剪承载力提高68%。在试验研究的基础上,给出TRC薄板加固梁的受剪承载力设计计算公式,公式计算结果与试验结果基本吻合。

Experimental study on shear capacity of RC beams strengthened with textile reinforced concrete

Based on experiments on the shear capacity of the inclined sections of reinforced concrete(RC) beams strengthened with textile reinforced concrete(TRC),changes of the shear strength,the deformation characteristics and the failure mode of the strengthened beams were studied.The test results show that the shear strength of inclined sections is effectively enhanced,the brittle behavior improved,the crack expansion blocked,and the beam deflection before the inclined crack occurrence is reduced.The tests indicate that the enhancement effect to the inclined section shear capacity of RC beams strengthened by TRC was more effective with the increase of shear span ratio.The inclined section capacity of the TRC strengthened beams was only enhanced 4%,if the shear span ratio was 1;the inclined section capacity could be increased by 68%,if the shear span ratio was 2.5.Calculation formula is also proposed for the inclined section shear strength of the TRC strengthened beams.