碳纤维增强树脂复合材料加固钢筋混凝土柱抗震性能的尺寸效应试验

研究了低周循环荷载下碳纤维增强树脂复合材料(CFRP)加固钢筋混凝土(RC)柱的抗震性能的尺寸效应，并以边长为150~450 mm、剪跨比均为3的三组几何相似的钢筋混凝土柱为试验研究对象，考虑了CFRP层数、构件尺寸和轴压比等变量的影响。研究结果表明:在相同的截面尺寸和轴压比下，CFRP加固RC柱的水平承载能力、耗能能力、延性和水平位移相对于未加固柱均得到了不同程度的改善，并且存在尺寸效应；CFRP加固RC柱的无量纲水平承载力会随着构件尺寸的增加而减小，尺寸效应明显；随着CFRP加固RC柱的尺寸增加，构件的安全储备系数明显减小。 

Experiment on the size effect of seismic behavior for reinforced concrete columns strengthened by carbon fiber reinforced plastics

The size effect on the seismic behavior of the reinforced concrete (RC) columns strengthened by carbon fiber reinforced polymer (CFRP) which subjected to low-cyclic loading was investigated. Three groups of geometrically similar RC columns with cross-sectional height ranging from 150 mm to 450 mm and a shear-span ratio of 3 were designed and tested. The influences of the number of CFRP layers, the size of the cross-section and the axial compression ratio on the seismic performance of the RC columns were also examined. It is indicated that: with the same structural size and axial compression ratio, the seismic behavior including the bearing capacity, the capacity of dissipated energy, the ductility capacity and the horizontal displacement of the CFRP strengthened RC columns are improved to different extents compared with the unreinforced columns, and the results indicate the existence of size effect; as the structural size of the tested columns increases, the dimensionless nominal bearing capacity of the CFRP strengthened RC columns is weaken and there is obvious size effect; as the structural size of the tested RC columns increases, the safety reserve coefficients decrease pronouncedly.