水泥砂浆及钢筋网水泥砂浆单面加固低强度砖墙抗震性能试验研究

发布时间：2018-09-05 07:44

【摘要】：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。
[Abstract]:Aiming at the old masonry structure buildings which are widely used and in urgent need of seismic reinforcement at present, four groups of low strength masonry walls with 12 masonry mortar strength grades lower than M2.5 are designed. The failure modes of low strength brick wall strengthened by cement mortar and reinforced concrete mortar were studied by pseudo-static test, in which 4 pieces of unreinforced brick wall were strengthened with single cement mortar and 4 pieces of single reinforced concrete mortar were used to reinforce brick wall, and the failure mode of low strength brick wall was studied by pseudo-static test. Effect of bearing capacity, deformation capacity, ductility, energy dissipation capacity, etc. The results show that strengthening the surface layer can improve the brittle failure mode of the original brick wall, increase the shear capacity, deformation and energy dissipation capacity, reduce the bearing capacity and stiffness attenuation, etc. The vertical compressive stress is 0. 1 MPa for the low strength brick wall. The seismic behavior of the brick wall reinforced with 40 mm reinforced concrete mortar is not obviously better than that of the brick wall strengthened with 20 mm cement mortar, and the seismic behavior of the former is better than that of the latter when the vertical compressive stress is 0.6 MPa. When the low strength brick wall with the vertical compressive stress of 0.6 MPa is strengthened by reinforced concrete mortar, even if the vertical steel bar is not anchored into the bottom beam, the yield can be achieved.
【作者单位】：中国建筑科学研究院工程抗震研究所;住房和城乡建设部防灾研究中心;北京建筑大学土木与交通工程学院;
【基金】：“十二五”国家科技支撑计划(2015BAK14B02) 中国建筑科学研究院标准规范研究课题(20140122336230030)
【分类号】：TU352.11;TU364

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