As a typical compression member, the concrete-filled steel tube has been widely used in civil engineering structures. However, little research on recycled self-compacting concrete filled circular steel tubular (RSCCFCST) columns subjected to eccentric load was reported. In this study, 21 specimens were designed and experimental studies on the stress-strain relationship of were carried out to study the mechanical behaviors. Recycled coarse aggregate replacement ratio, concrete strength grade, length to diameter ratio and eccentric distance of specimens were considered as the main experimental parameters to carry out eccentric compression tests. The corresponding stress-strain relationship curves were used to analyze the influence of concerned parameters on eccentric load-bearing capacity of RSCCFCST columns. The experimental results show that the strain of the eccentric compression stress-strain curves increase with the increase of recycled coarse aggregate replacement ratio and concrete strength grade. With increase of eccentric distance, the ductility of specimens increases while the bearing capacity decreases. Moreover, a phenomenological model of RSCCFCST columns is proposed, which exhibits versatile ability to capture the process during loading. The present study is expected to further understanding the behaviors and to provide guidance of RSCCFCST columns in design and engineering applications.

中文翻译：

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再生自密实钢管混凝土柱偏心受压应力-应变关系

作为典型的压缩构件，混凝土填充钢管已广泛用于土木工程结构中。但是，关于偏心荷载作用下的再生自密实混凝土填充圆钢管（RSCCFCST）柱的报道很少。在这项研究中，设计了21个试样，并进行了应力-应变关系的实验研究，以研究其力学行为。再生粗骨料替代率，混凝土强度等级，长径比和试样的偏心距被认为是进行偏心压缩试验的主要实验参数。利用相应的应力-应变关系曲线分析了相关参数对RSCCFCST柱偏心承载力的影响。实验结果表明，偏心压缩应力-应变曲线的应变随着再生粗骨料置换率和混凝土强度等级的增加而增加。随着偏心距的增加，试样的延展性增加，而承载能力降低。此外，提出了RSCCFCST色谱柱的现象学模型，该模型具有在装载过程中捕获过程的通用能力。预期本研究将进一步了解其行为，并为设计和工程应用中的RSCCFCST色谱柱提供指导。试样的延展性增加，而承载能力降低。此外，提出了RSCCFCST色谱柱的现象学模型，该模型具有在装载过程中捕获过程的通用能力。预期本研究将进一步了解其行为，并为设计和工程应用中的RSCCFCST色谱柱提供指导。试样的延展性增加，而承载能力降低。此外，提出了RSCCFCST色谱柱的现象学模型，该模型具有在装载过程中捕获过程的通用能力。预期本研究将进一步了解其行为，并为设计和工程应用中的RSCCFCST色谱柱提供指导。