页岩烧结保温砌块超薄灰缝墙体抗震性能试验研究

Experimental study on seismic behavior of shale fired heat-insulation block walls with ultra-thin mortar joint

为研究页岩烧结保温砌块超薄灰缝墙体的抗震性能,以有无构造柱、竖向压应力、高宽比、开洞率及开洞形式作为设计参数设计并制作10个试件,对其进行水平低周反复荷载试验。分析了该类墙体在拟静力荷载作用下的破坏过程和破坏形态,研究了构造柱、竖向压应力、高宽比、开洞率及开洞形式对其承载力、滞回曲线、骨架曲线、延性、耗能性能、刚度退化等的影响。试验结果表明:构造柱-圈梁体系充分发挥了其对内部砌体墙的约束作用,实现了墙体"裂而不倒"的目标;增加竖向压应力、减小高宽比,均可提高墙体的受剪承载力,减缓墙体刚度退化速度;构造柱的存在对提高墙体受剪承载力和延性均有明显效果;洞口的削弱作用使墙体受剪承载力下降,耗能能力变差。建立了页岩烧结保温砌块超薄灰缝墙体受剪承载力计算式,计算结果与试验结果吻合较好。

In order to study the seismic behavior of shale fired heat-insulation block walls with ultra-thin mortar joint,ten specimens were designed and made considering the parameters of the existence of constructional column,vertical compressive stress,height-to-width ratio,ratio and form of openings,and tested under low-cycle reversed loading. The damage process and failure mode were analyzed and the load carrying capacity,hysteretic curve,skeleton curve,ductility,energy dissipation capacity and stiffness degradation were also studied. The test results indicate that the constructional column-ring beam is full play to the function of constraint for the masonry walls,and the design goal of fracture but not collapse can be achieved. Increasing the vertical compressive stress or reducing the height-to-width ratio,the shear capacity is enhanced,and stiffness degradation is slower. Because of the constructional column,the shear capacity and ductility are enhanced. Because of the opening,the shear capacity and energy dissipation capacity are poor. Finally,the formula for shear capacity calculation is proposed,which agrees well with the test results.