不同煤矸石取代率剪力墙抗震性能研究

Study on seismic behavior of shear wall with different coal gangue replacement rate

为了探究煤矸石取代率对煤矸石混凝土剪力墙抗震性能的影响,对3片不同煤矸石取代率的剪力墙进行低周反复荷载试验。根据所得剪力墙的破坏模式、荷载-位移关系和应力分布特征,分析了剪力墙承载力、延性、刚度退化、强度退化和耗能等指标的变化规律。结果表明:不同煤矸石取代率的中高剪力墙发生弯剪型破坏,且具有相似的破坏形态和受力特征。伴随煤矸石取代率的提高,试件承载力和延性与其呈负相关,试件割线刚度和强度出现梯度削减,且削减速度不断提高。同时煤矸石取代率对试件初始耗能水平影响显著,随着加载等级提高,试件耗能水平与骨料取代率呈负相关,但影响有限。考虑煤矸石作为混凝土骨料后结构自重减轻、成本低、符合绿色低碳理念,故可替代普通混凝土剪力墙应用于村镇农房以及中低层建筑之中。

In order to explore the influence of coal gangue replacement rate on the seismic performance of coal gangue concrete shear wall,low cyclic loading tests were carried out on three shear walls with different coal gangue replacement rates.Based on the damage modes,load-displacement relationships and stress distribution characteristics of the shear walls,the variation laws of bearing capacity,ductility,stiffness degradation,strength degradation and energy dissipation of shear walls were analyzed.The results show that bending-shear type damage occurs in medium and high shear walls with different coal gangue replacement rate,and the similar failure modes and stress characteristics can be found out.Along with the increase of coal gangue replacement rate,the specimen bearing capacity and ductility are negatively correlated with it.The secant stiffness and strength of the specimen have gradient reduction,and the reduction speed is increasing.While coal gangue replacement rate has a significant effect on the initial energy consumption level of the specimen.As the loading level increases,the energy consumption level of the specimens is negatively correlated with the aggregate replacement rate,but the effect is limited.Considering the reduced structural self-weight,low cost,and alignment with the concept of green and low-carbon development,coal gangue,when utilized as concrete aggregate,can thus replace conventional concrete shear walls in rural houses and low-to-medium-rise buildings.