GFRP管约束再生混凝土柱抗震性能与损伤评价

On the seismic behavior and damage assessment of recycled aggregate concrete filled GFRP tube column

以再生粗骨料取代率、混凝土强度为主要参数,开展了6个玻璃纤维增强塑料(GFRP)管再生混凝土柱试件的低周反复试验,对试件的承载力、刚度退化过程、滞回特性、延性、耗能能力、破坏形态等抗震性能进行研究。研究结果表明:GFRP管约束再生混凝土柱的耗能能力、延性、滞回特性随着再生粗骨料取代率、混凝土强度的改变而略有变化;粘结滑移的效应对试件的抗震性能影响很小;GFRP管约束再生混凝土柱极限承载力受混凝土强度作用影响并不明显。最后,提出GFRP约束再生混凝土柱归一化损伤计算公式,该模型能较好地反映GFRP管约束再生混凝土柱的损伤发展。

Low frequency cyclic loading test of six recycled concrete filled Glass Fiber Reinforced Plastic （GFRP） tube （RCFF） columns was performed. The main parameters in tbe test are the Recycled Coarse Aggregate （RCA） replacement percentage, the strength of core concrete. The bearing capacity, the stiffness degradation, the ductility and the energy dissipation capacity and the failure pattern of columns with different RCA replacement percentage were studied. The findings indicate that the energy dissipation capacity, ductility and hysteresis vary slightly with the RCA replacement percentage and concrete strength. It is shown that the bond-slip has little effect on the seismic performance of the specimens. The effect of RCA replacement percentage on the bearing capacity of confined recycled concrete columns is not obvious. Finally, a normalization damage assessment method was developed for the RCFF columns. The model could well explain the damage development of RCFF columns.