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本文对8根大比例的FRP加固钢筋混凝土桥柱模型在轴压比为0.2的恒定轴压力下进行拟静力试验,再对其中5根试验柱在经历有限的地震作用后进行长期荷载作用下的轴压试验。试验表明,FRP加固柱的徐变变形远小于对比柱的徐变变形;带损伤的加固柱在长期荷载作用下的变形发展受加固柱的损伤程度和持荷大小的控制,并与FRP的弹性模量有关;在试验条件下,带损伤的加固柱长期轴向变形呈稳定态势。采用AEMM和F ind ley模型为基础,考虑损伤程度、密封状态、三向应力状态和应力重分布等因素的影响,建立了损伤加固柱的徐变计算模型,并进行了验证。分析表明,损伤对加固柱的徐变发展和徐变破坏时限有显著影响。
In this paper, eight large-scale FRP-reinforced reinforced concrete bridge-and-pillar models are subjected to pseudo-static test under a constant axial pressure with an axial compression ratio of 0.2, and then five of the test columns are under long-term loading after experiencing limited earthquake action. Axial compression test. The tests show that the creep deformation of FRP-reinforced columns is much smaller than the creep deformation of the comparative columns; the deformation of the reinforced columns with damage under long-term loading is controlled by the degree of damage and the size of the loaded columns of the reinforced columns, and it is also related to the elasticity of the FRP. Modulus is relevant; under test conditions, the long-term axial deformation of the reinforced column with damage is stable. Based on the AEMM and Findley model, considering the influence of the damage degree, sealing state, three-dimensional stress state and stress redistribution, a creep calculation model for damage-reinforced columns was established and verified. The analysis shows that the damage has a significant effect on the creep development and creep failure time of the reinforced columns.