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采用约束混凝土的应力-应变关系,用数值方法计算了等效矩形应力图特征系数β,提出了基于有效约束区和非有效约束区的平均约束混凝土抗压强度fcc,e表征约束矩形截面的混凝土强度,并对约束柱偏心距增大系数η和受压区混凝土平均极限压应变进行研究,参考普通混凝土偏压柱理论提出了碳纤维缠绕加固偏压柱承载力公式。引入文献中的计算方法,即认为约束偏压柱的承载力是非约束的普通混凝土柱的承载力再乘以与偏心距、纤维加固率、混凝土强度有关的系数,对其进行修正,使计算精度提高。已有试验资料验证了两种计算方法的有效性。
Based on the stress-strain relationship of confined concrete, the characteristic coefficient β of equivalent rectangular stress diagram was calculated by numerical method. The compressive strength of mean confined concrete (fcc, e) based on effective restraint zone and non-effective restraint zone Strength of the constrained column and the average ultimate compressive strain of confined column eccentricity were studied. The formula of bearing capacity of carbon fiber reinforced circular columns was proposed with reference to ordinary concrete column theory. The calculation method introduced in the literature is that the bearing capacity of constrained eccentric columns is unconstrained and then multiplied by the bearing capacity of ordinary concrete columns and then corrected by the factors related to eccentricity, fiber reinforcement rate and concrete strength, improve. The experimental data have verified the validity of the two calculation methods.