钢筋网片改性砂浆加固石砌体墙抗震性能试验研究

Experimental study on seismic behavior of stone masonry walls strengthened with steel-meshed modified cement mortar

为提高条石干砌石墙的抗震性能,采用钢筋网片改性砂浆对其进行加固。对4片不同加固参数的条石墙体进行低周水平往复加载试验,重点研究改性水泥砂浆强度、钢筋强度及加固方式(单面加固和双面加固)对加固石砌墙体的破坏形态、承载能力、滞回曲线、骨架曲线、耗能能力等抗震性能的影响。试验结果表明:采用钢筋网片砂浆面层对墙体进行加固,能够有效提高条石墙体的受剪承载力和滞回耗能能力;采用双面加固或提高改性砂浆强度可进一步提高墙体受剪承载力;墙体采用双面加固的承载力提高幅度是单面加固墙体的3倍以上。基于研究结果提出了采用钢筋网片改性砂浆加固条石干砌石墙受剪承载力的计算公式,可供后续研究和工程实践参考。

Four stone masonry wall specimens strengthened with steel-meshed modified cement mortar were tested under cyclic horizontal loading. Parameters investigated included the strength of modified cement mortar, strength of reinforcing steel bars, and strengthening modes （single-faced or double-faced）. The failure mode, bearing capacity, hysteretic loops, skeleton curve, and energy-dissipation capacity of specimens were investigated. It is found that the shear strength and energy-dissipation capacity of the strengthened walls are increased significantly compared to the unstrengthened walls. Adopting double-faced strengthening method and increasing mortar strength can further improve the shear strength, and the former one is much more effective. An empirical model to calculate the bearing capacity of strengthened walls is proposed and the predicted values agree well with the test ones.