摘要
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。
The characteristic coefficient B of equivalent rectangular stress block based on the stress-strain relationship of confined concrete was calculated by using numerical method, and the concrete strength of confined rectangular section characterized by average compressive strength of confined concrete fac,e based on effectively confined area and the ineffectively confined area was proposed. The enhancement coefficient of restrained columns eccentricity B and the average ultimate compression strain of compressive concrete were researched. A series of formulas were proposed to calculate the bearing capacity of eccentric compression column strengthened with wrapped CFRP according to eccentric compression column theory of unrestrained concrete. The calculation method of literature that the bearing capacity of the confined eccentric compression column was the bearing capacity of the non-confined common concrete column multiplied by coefficient related to eccentricity, fiber strengthening ratio and the concrete strength was modified. The precision and effectiveness of the two calculation methods were verified by test data.
出处
《建筑结构》
CSCD
北大核心
2010年第5期42-46,共5页
Building Structure
关键词
偏心受压
矩形截面
有效约束区
简化计算
条带加固
eccentric compression
rectangular section
effective confinement area
simplified calculation
straps strengthening
