玻璃纤维聚合物加固混凝土柱抗震性能研究

Investigation on seismic-resistance behavior of concrete columns strengthened with GFRP

为了研究外粘玻璃纤维布加固震损柱的抗震性能,共有11根柱进行了低周反复荷载试验,其中3根在原始状态下进行试验以确定其破坏模式,另8根柱预裂后粘贴玻璃纤维布进行修补加固后进行试验.试验结果表明,未加固柱的强度和延性都比较低,加固后柱的强度、变形能力以及耗能能力均明显改善.在试验研究的基础上,本文作者提出了加固柱目标抗震延性系数的计算方法,试验结果和计算结果基本吻合.

To study the seismic-resistance behavior of reinforced concrete columns retrofitted with GFRP sheets, eleven RC columns were tested under cyclic lateral load and constant axial load. Three columns were tested on the ＂as built＂ condition to investigate the failure modes under different degrees of axial loads. Eight other columns were pre-damaged and tested after retrofitted with bonding GFRP sheets. The ＂as built＂ columns suffered failures at low strength and displacement ductility. Strength, displacement and energy dissipating capacity of the retrofitted columns were improved significantly. Based on reported test results for GFRP-strengthened concrete, one calculation method of displacement ductility factor is provided, and approximate agreement between test and theoretical results is achieved.