中文摘要：

为研究钢管再生混凝土柱的抗震破坏机理与损伤演化过程,以再生粗骨料取代率、长细比、轴压比和含钢率为变化参数,设计10个圆钢管再生混凝土柱试件和6个方钢管再生混凝土柱试件,进行拟静力试验。观察试件的破坏形态,获取试件的强度衰减,实测荷载-应变滞回曲线,引入基于变形、基于耗能和基于变形与耗能的地震损伤评估模型。研究结果表明：钢管再生混凝土柱试件的破坏形态与普通钢管混凝土柱相似,强度衰减经历一个由多到少再到多的过程;滞回曲线呈现出比较饱满的梭形;对于圆形试件,随着取代率的增加,损伤指标D无明显统一的规律,而方形试件则依次增加;3种地震损伤评估模型均可用于钢管再生混凝土柱的损伤分析,但各有利弊。研究结果可为钢管再生混凝土构件的工程应用提供依据和参考。

英文摘要：

To study seismic failure mechanism and damage evolution process of recycled aggregate concrete filled steel tube column, the quasi-static tests of ten recycled aggregate concrete filled circular steel tube column speci- mens and six recycled aggregate concrete filled square steel tube column specimens with different replacement ratios of recycled coarse aggregate, slenderness ratios, axial compression ratios and steel ratios were carried out. Failure modes were observed, strength attenuation was obtained, hysteretic curves of load versus strain were measured, seismic damage assessment models based on deformation, energy dissipation and both deformation and energy dissi- pation were introduced. It is shown that failure modes of recycled aggregate concrete filled steel tube columns are similar to those of common concrete filled steel tube columns. Strength dropoff changes from much to little then much; Hysteretic curves look like plump shuttle. With replacement ratio increasing, there is no obvious uniform rule for damage index D of circular specimens, while the index D of square specimens increases successively. Three earthquake damage assessment models can be used for damage analysis of recycled aggregate concrete filled steel tube column, but each has advantages and disadvantages. This study can provide basis and reference for the appli- cation of recycled aggregate concrete filled steel tube component in practical engineering.