钢管再生混凝土柱抗震性能与损伤评价

以再生粗骨料取代率、混凝土强度为主要参数,完成了6个钢管再生混凝土柱试件的低周反复试验,研究了其破坏形态和滞回特性,分析其承载力、刚度退化、延性、耗能能力、破坏形态等抗震性能.结果表明:钢管再生混凝土柱具有良好的抗震性能；试件的耗能能力、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；考虑粘结滑移与否对试件的抗震性能影响很小；钢管再生混凝土柱极限承载力受再生粗骨料取代率的影响并不明显.最后,提出了基于Miner原理的改进损伤评估模型,通过对比表明该模型能较好地反映钢管再生混凝土柱的抗震损伤水平,与试验结果符合良好.

On Seismic behavior and damage assessment of recycled aggregate concrete filled steel tube column

This paper presents a low frequency cyclic loading test for six recycled concrete filled steel tube (RCFS) columns. The main parameters in this study include the recycled coarse aggregate (RCA) replacement percentage and the strength of core concrete. The bearing capacity, stiffness degradation, ductility, energy dissipation capacity and failure pattern of columns with different RCA replacement percentage are experimentally studied. Research findings indicate that the RCFS columns exhibit fine seismic behavior. The energy dissipation ability, ductility and hysteresis performance change slightly with the variation of the RCA replacement percentage and concrete strength. It is also figured out that the bond slip has little effect on the seismic behavior of the RCFS columns, and the RCA replacement percentage does not influence the bearing capacity of confined recycled concrete columns obviously. Finally, an improved damage assessment model which is based on the Miner principle is developed. The damage level of RCFS columns is better reflected by this model, and the analysis results are in accordance with the test ones.