带SBS层阻尼砌体填充墙钢筋混凝土框架结构抗震性能试验研究

Experimental study on seismic behaviors of damped masonry in-filled reinforced concrete frame structures with SBS layers

针对阻尼砌体填充墙的砌体单元抗拉能力不足及预留缝隙不便于建筑使用的问题,提出改进的墙体构造措施,并制作2榀阻尼砌体填充墙框架试件,对其进行拟静力试验,研究阻尼砌体填充墙框架结构的抗震性能。试验结果表明:拉结筋通长布置的构造措施可有效解决砌体单元抗拉能力不足的问题;在克服了砌体单元的拉裂破坏后,阻尼砌体填充墙的耗能效果显著提高,阻尼砌体填充墙框架结构的承载力衰减更慢,滞回曲线更饱满,耗能能力更强,等效黏滞阻尼系数达到0.12以上;用M1.5砂浆和用发酵聚氨酯填缝的构造措施都是可行的,可确保阻尼砌体填充墙率先耗能、发挥保护主体框架的作用,明显提高阻尼砌体填充墙早期对框架的刚度贡献,同时保留阻尼砌体填充墙不过强约束框架变形、不改变框架结构的延性破坏模式、不造成框架结构延性变差的良好性能;填缝后,阻尼砌体填充墙框架结构的初始抗侧刚度明显提高,位移延性系数在6.0以上,极限层间位移角在1/40以上,可以满足结构在大震下的弹塑性变形要求。

Against the problem of damped infill walls( DIW) that tensile capacity of masonry units is not enough and reserved apertures are inconvenient for building occupation,some construction improvement measures are proposed. 2DIW-frame specimens were made and tested under quasi-static loads to study the seismic behaviors of DIW-frame structures. The experimental results show that the construction measurement of the bars arranged in the whole length can effectively resolve the problem that DIW's masonry unit lacks enough tensile capacity. The energy dissipation effect of DIW increases significantly,while the bearing capacity attenuates more slowly. The hysteretic curve gets plump shuttle and the equivalent damping ratio reaches above 0. 12. Furthermore,the construction measures by filling the reserved apertures with M1. 5 mortar and with fermentative polyurethane are both feasible,which can ensure that DIW takes the lead in energy consumption and plays a role in protecting its surrounding frame. The filling measures can also increase DIW's initial stiffness obviously,but produce little adverse impact on the good performance that DIW don't constraint frame's deformation too strongly,don't change frame's ductile failure mode,and don't cause structure's ductility to get worse. After the reserved apertures being filled,the initial lateral stiffness of DIW-frame structure increases obviously,the displacement ductility factor is above 6. 0,the ultimate storey drift is above 1 /40,which can satisfy the plastic deformation demand of frame structures under strong earthquake.