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选用强度高、韧性好和耐久性强的微细钢纤维高强水泥砂浆作为加固材料,采用结构胶粘结加螺栓的锚固方式,提出了微细钢纤维高强水泥砂浆板嵌入式加固钢筋混凝土梁的方法。通过受剪试验,分析了加固梁受剪破坏形态、荷载挠度曲线、荷载特征值、加固板和弯剪区混凝土应变等,通过与未加固梁对比,分析了加固效果。试验结果表明,微细钢纤维高强水泥砂浆板改变了裂缝形态,延缓了临界斜裂缝的产生,减小了破坏时裂缝的宽度,增加了梁体整体刚度,显著提高了抗剪承载力;间距过大时斜裂缝经过的加固板数量过少加固效果较差,但加固板数量太多,加固时开槽、钻孔对梁体界面削弱较大,反而影响加固效果,板间距适中时最佳,本试验中最优间距为150 mm。
A kind of micro-fiber reinforced high-strength cement mortar embedded with steel fiber reinforced high-strength cement mortar with high strength, good toughness and durability is selected as the reinforcing material and the anchoring method of structural adhesive bonding and bolting is adopted. Through the shear tests, the shear failure modes, the load deflection curves, the load characteristics, the concrete strain in the reinforcement plate and the shear-bending zone were analyzed. The reinforcement effect was analyzed by comparison with the un-strengthened beams. The test results show that the micro-fiber reinforced high-strength mortar plate changes the fracture morphology, delays the occurrence of critical diagonal cracks, reduces the width of the fracture during fracture, increases the overall rigidity of the beam and significantly increases the shear capacity; Large diagonal cracks through the reinforcement plate is too small to strengthen the effect is poor, but the number of reinforcement plate is too large, slotted reinforcement, drilling weaken the interface of the beam larger, but affect the reinforcement effect, the best board spacing moderate, The optimal spacing for this test is 150 mm.