外叶墙为非承重墙夹芯墙的抗震性能研究

Seismic Behavior of Sandwich Walls Subjected to Cyclic Loading on the Center of the Interior Walls

对4片高度相同、高宽比和竖向压应力不同的夹芯墙进行了水平低周反复加载试验,研究了这种墙体构件的抗震性能.根据实际受力特点,试验中水平荷载与竖向荷载都加载于试件内叶墙的形心.观测了该墙体受力-变形-损伤-裂缝-屈服-破坏的全过程;分析了该墙体的破坏特征、滞回曲线、骨架曲线、位移延性、承载力、拉接筋受力性能和内、外叶墙协同工作能力等.研究结果表明:由于拉接筋的作用,内、外叶墙协同工作性能良好,外叶墙在试验过程中破坏轻微;试验过程中出现剪切滑移和'捏缩效应';内叶墙在高宽比较小时,呈现明显的剪切破坏,在高宽比较大时,呈现出弯剪破坏;试件的承载力随着轴压比的提高而增加.采用规范(GB 50003-2001)中配筋砌体抗剪承载力平均值计算公式进行计算,结果较试验值小.

Experimental studies of four sandwich walls with the same height but different height-width ratio and different vertical compressive stress,which were subjected to in-plane cyclic loading,were presented and tests results were discussed.Based on actual mechanical characteristics,the vertical and horizontal loads were loaded on the center of the interior walls.The whole process of loading-deforming-damaging-cracking-yielding-failure was observed during the test.The failure characteristics,hysteretic curves,skeleton curves,displacement ductility,bearing capacity,behavior of the tie bar and coordination between two cavity walls were analyzed.The result showed that the interior walls and the outer walls worked together well,and the outer walls were slightly damaged;shear slipping and pinching occurred in the test;shear failure occurred when the ratio of height to width was small and bending-shear failure occurred when the ratio increased and the ultimate bearing capacity of the walls increased with the increase of the axial compressive ratio.The shear capacity of the walls in the test is greater compared with the GB 50003-2001 Code.