FRP徐变对FRP约束混凝土柱徐变的影响分析

Analysis of Effect of FRP Creep on Creep of Fiber-wrapped Concrete Columns

综述了国内外FRP约束混凝土徐变及FRP徐变的研究现状与存在的问题。基于多轴应力状态下混凝土的徐变理论及流动率法的混凝土B3徐变模型,分别考虑外包FRP布徐变及忽略其徐变对约束混凝土柱徐变的影响,建立了FRP约束混凝土短柱在轴向荷载作用下的徐变计算模型。利用此模型对计入FRP的徐变与忽略FRP徐变的计算结果进行了对比分析,结果表明考虑FRP徐变与否计算出的理论值有一定差异。与5组试验数据相对比,考虑FRP徐变的理论值更接近于试验值。

Based on reviewing the study on the creep of FRP and flier-wrapped concrete columns （FWCC）, a creep model is constructed to analyze, the time-dependent behavior of FWCC under long-term sustained axial load by utilizing the creep theory of concrete under multi-axle stresses and B3 creep model for concrete under multi-aiaxial stresses.The creep of FWCC with the creep of FRP and without it are calculated respectively, showing that the results with considering the creep of FRP agree better with five groups of experimental data that without FRP crop. The difference between the two theoretical values is not neglectable.