摘要
An experimental study, in which six columns were loaded concentrically toinvestigate the behavior of reinforced normal strength and high strength circular columns underconcentric compression, is described. The concrete strengths of the columns were 30 MPa and 60 MPa.The primary variables considered were the concrete strength and the amount of transversereinforcement. Test results indicate that smaller hoop spacing provides higher column capacity andgreater strength enhancement in a confined concrete core of columns. For the same lateralconfinement, high strength concrete columns develop lower strength enhancement than normal strengthconcrete columns. Both the strength enhancement ratio (f'_(cc) /f'_(co)) and the column capacityratio (P_(test)/P_o) were observed to show linear increase variations with rho_s f_(yt)/f'_c incircular columns.
通过对6根圆柱体钢筋混凝土柱的轴压试验,研究普通及高强混凝土柱的轴向受压性能.柱的混凝土强度为30 MPa和60 MPa.所考虑的主要因素为混凝土强度和箍筋用量.试验结果表明,箍筋间距越小,则柱承载能力越高,混凝土核心约束强度提高幅度越大.在相同的侧向约束下,高强混凝土柱的核心强度提高幅度低于普通混凝土柱.混凝土核心约束强度与非约束强度比率(f'cc/f'co)及柱承载能力试验值与理论值之比(Ptest/Po)均与约束率ρs/fyt/f'c成正比.
