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开展了具有端部约束的碳纤维布加固混凝土梁的高温反应分析,探讨了轴向/转动约束刚度比、梁截面尺寸、跨度、荷载比、加固量、配筋率、保护层厚度和防火涂料厚度等参数对ISO834标准升温作用下约束加固梁轴力的影响规律。在此基础上,给出了一个高温下约束加固梁的轴力实用计算方法。研究表明,随着升温时间增加,约束加固梁的轴力比总体呈现出先逐渐增大而后渐趋平缓甚至降低的趋势;防火保护(即使防火涂料厚度只有10mm)对高温下约束加固梁的梁端轴力影响显著。
The high temperature response analysis of CFRP-reinforced concrete beams with end restraint was carried out. The axial / rotational restraint stiffness ratio, beam cross-sectional dimension, span, load ratio, reinforcement, reinforcement ratio, protective layer thickness and fireproof coating thickness Influence of isoparameters on axial force of restrained beam under ISO834 standard temperature increase. On this basis, a practical method for calculating the axial force of a beam with strengthened beam under high temperature is given. The results show that with the increase of heating time, the axial force ratio of the beam strengthened by restraint tends to increase gradually and then gradually decreases or even tends to decrease gradually. The fire protection (even if the thickness of the fire retardant coating is only 10mm) Axial force significantly affected.