窗间墙锚固配筋砖混结构教学楼抗震性能试验研究

Experimental study on seismic performance of brick-concrete masonry school buildings with wall piers reinforced with anchored reinforcements

为改善砖混结构教学楼的抗震性能,通过对其纵向窗间墙局部配筋并在墙体两端采用竖向钢筋进行锚固配筋,按照1/2的缩尺比例设计了2个砖混子结构模型。采用拟静力试验分别对普通窗间墙和配筋窗间墙的子结构模型的破坏模式、承载能力、变形能力、刚度退化、延性、耗能性能以及窗间墙的破坏模式和纵墙的破坏机制等进行了分析。结果表明:普通窗间墙模型表现为层间破坏机制,窗间墙发生剪切破坏,纵墙发生'强梁弱柱'式破坏;窗间墙局部配筋并进行锚固的模型发生整体型破坏,窗间墙弯曲破坏,纵墙的破坏机制具有'强柱弱梁'特征,层间变形均匀,模型的破坏形态、耗能能力和延性等均得到改善。

Quasi-static tests on two half-scale two-story brick-concrete sub-structure models were carried out in order to improve the seismic performance of brick-concrete masonry school buildings. The wall piers between openings were partiall modes, as well y reinforced with horizontal reinforcements that were reliably anchored using vertical reinforcements. The failure load bearing capacity, deformability, rigidity degradation, ductility and hysteretic behavior of the two models, as failure modes of piers and failure mechanism of longitudinal walls were investigated. The results indicate that a story mechanism occurs in ordinary masonry model with the piers failing in shear failure. And the longitudinal walls exhibit strong spandrel-weak pier failure mechanism. However, partially reinforced wall piers are characterized by flexural failure with horizontal cracking in the mortar bed joints. Spandrels are severely damaged due to the formation of global failure mechanism. Strong pier-weak spandrel failure mechanism is guaranteed with uniform drift distribution The level of damage, energy dissipation capacity and ductility of model are significantly improved.