强化再生骨料混凝土柱抗震性能研究

Experimental study on seismic behavior of enhanced recycled aggregate concrete columns

为研究粗骨料强化的再生混凝土柱和普通混凝土柱抗震性能的差异,设计并制作了5根强化再生骨料混凝土柱和3根普通混凝土柱,选取轴压比和体积配箍率为参数变量,进行低周反复荷载试验.结果表明:框架柱试件在低周反复荷载作用下经历了弯曲破坏和弯剪破坏;轴压比为0.10、0.25、0.40时,强化再生骨料混凝土柱承载力较普通混凝土柱承载力稍大,该强化方式对柱承载力提升效果明显;通过增大强化骨料再生混凝土柱的体积配箍率,可以提高强化再生骨料混凝土柱的承载能力与变形能力,减缓强度衰减速度,降低刚度退化速度,增强其抗震性能.

To study the difference in seismic performance between Enhanced Recycled Coarse Aggregate(ERCA)concrete columns and Natural Coarse Aggregate(NCA)concrete columns,five reinforced recycled aggregate concrete columns and three ordinary concrete columns were designed and fabricated,and the specimens were tested under low cyclic loads with the axial compression ratio and volume stirrup ratio as parametric variables.The results showed that the specimens experienced two failure modes,namely,bending-shear failure and bending failure.The lateral bearing capacities of ERCA columns increased compared to those of NCA columns corresponding to the axial compression ratios of 0.10,0.25,and 0.40,respectively,indicating that this strengthening method could provide a significant increase in bearing capacities.Increasing the volume stirrup ratio could enhance the bearing capacity and deformation capacity,decrease the strength degradation and stiffness degradation rate,and improve the seismic performance for ERCA columns.