FRP约束混凝土快速荷载下的强度计算

Computation of strength for FRP confined concrete under fast loading

通过42个不同包裹条件下的FRP约束混凝土圆柱体试件静载和在不同应变速率下的试验,研究FRP约束混凝土快速荷载下的强度.结果表明,FRP约束混凝土在快速荷载下的强度随着应变速率的增加而提高,与对数应变速率呈线性关系,其斜率α与约束比ξ有关,α随ξ的增加而增大.拟合了FRP约束混凝土快速荷载下的强度计算公式,计算结果与试验值吻合较好,为FRP约束混凝土合理应用于混凝土结构抗震加固提供了参考依据.

The results of test made with 42 different FRP confined concrete columns under static loading and different strain rates show that the strength of FRP confined concrete under fast loading increases with the increase of strain rate, and is linearly proportional to the logarithmic strain rate. In addition, slope α is related to constraint ratio ξ, and increases with ξ. A formula is established for the calculation of the strength of FRP confined concrete under fast loading and the result of calculation is in good agreement with the test data, which provides the theoretical basis for FRP confined concrete to be applied in seismic strengthening of concrete structure.