嵌缝加固条石砌筑石墙的抗震性能初探

Study on Seismic Behavior of Stone Wall Strengthened by Mounting Bards in Bed Joints

提出钢筋-聚合物砂浆对条石砌筑石墙进行嵌缝加固的方法。通过两组共5个干砌甩浆石墙加固试件和对比试件低周反复加载试验,研究所提加固方法加固条石砌筑石墙的抗震性能和加固效果。加固对象包括未损伤石墙和水平灰缝滑移破坏的损伤石墙。其中,未损伤石墙采用钢筋-聚合物砂浆嵌缝加固方法;发生单缝水平滑移破坏损伤石墙的加固采用对破坏灰缝嵌入聚合物砂浆和钢筋剪力键。通过对试验过程的观察,了解加固后石墙的破坏过程和破坏形态,分析加固后石墙的承载能力、变形性能、耗能能力和刚度退化等。试验结果表明,加固后石墙的承载力得到明显的提高,墙体的整体性能和抗震能力有较大的改善。

A new approach to retrofit stone masonry wall by mounting bards in bed joints is proposed. To investigate the seismic behavior and strengthening effectiveness of stone masonry walls strengthened by such approach, two groups of low cyclic repeated horizontal loading test were performed. Five specimens strengthened before damaged and after damaged for sliding failure in bed joints were studied through the test. Of which, the undamaged specimen was retrofitted by mounting bards with polymer mortar after maintenance, the damaged specimen for sliding failure in bed joints was retrofitted by shear connector with polymer mortar. Based on the test result, the failure process and failure models of unretrefitted and retrofitted specimens are studied. Also, the carrying capacity, deformation capacity, energy dissipation capacity and stiffness degrading of specimens are analyzed. It indicates that the carrying capacity of reinforced specimens is increased obviously with the well improvement of integrality and seismic performance.