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针对目前量大面广且急需抗震加固的老旧砌体结构房屋,设计了4组共12片砌筑砂浆强度等级低于M2.5的低强度砖墙,其中4片未加固砖墙、4片单面水泥砂浆加固和4片单面钢筋网水泥砂浆加固砖墙,通过拟静力试验,研究了水泥砂浆及钢筋网水泥砂浆单面加固对低强度砖墙破坏模式、承载力、变形能力、延性、耗能能力等的影响。结果表明:加固面层可改善原砖墙的脆性破坏模式,提高受剪承载力、变形和耗能能力,减小承载力以及刚度的衰减等;竖向压应力为0.1 MPa的低强度砖墙,采用单面40 mm钢筋网水泥砂浆面层加固后,其抗震性能没有明显好于采用单面20 mm水泥砂浆面层加固的砖墙,竖向压应力为0.6 MPa时前者抗震性能明显好于后者;竖向压应力为0.6 MPa的低强度砖墙,采用钢筋网水泥砂浆面层加固时,即使竖向钢筋不锚入底梁也能达到屈服。
In view of the large amount of large-scale and urgent need of earthquake-resistant old masonry buildings, four groups of 12 low-strength masonry masonry mortars with lower strength levels than M2.5 are designed, of which 4 are not reinforced and 4 Single-sided cement mortar reinforcement and four single-sided steel mesh reinforced cement mortar brick wall, through the quasi-static test, studied the cement mortar and steel mesh reinforced mortar single-wall low-strength brick wall failure mode, bearing capacity, deformation capacity , Ductility, energy consumption and other effects. The results show that: the reinforcement of the surface layer can improve the brittle failure mode of the original brick wall, improve the shear capacity, deformation and energy dissipation capacity, reduce the bearing capacity and stiffness attenuation; low compressive strength of 0.1 MPa low-strength brick wall , The seismic performance of cement mortar with one side of 40 mm steel mesh reinforcement is not significantly better than that of the one reinforced with 20 mm cement mortar. When the vertical compressive stress is 0.6 MPa, the seismic performance of the former is better than the latter The latter; the low compressive stress of 0.6 MPa low-strength brick wall, the use of reinforced cement mortar surface reinforcement, even if the vertical reinforcement is not anchored into the end beam can yield.