This paper proposes the use of concrete with a high water/cement ratio of 0.65, 455 kg/m³ of mixed fly ash and low-bond high-strength (LBHS) rebar to develop resilient circular columns confined by bolted steel tubes. The test results indicated that the proposed bolted steel tube-confined fly ash concrete columns with LBHS rebar had great self-centering (SC) capacity and stable lateral load resistance until reaching a large drift value. Low bonds resulted in delayed yielding of the longitudinal rebar; therefore, the column had better deformability and durable SC capacity compared with a column with normal high-bond steel rebar. Furthermore, the anchorage tie plate at the contraflexure section of double curvature columns was necessary to prevent the steel rebar from slipping. Shortening the anchorage length of the longitudinal rebar within the beam-column joint had little influence on the seismic behavior of the test column. Bolted steel tubes could provide better safety for testing columns compared with that of welded steel tubes, especially at the large deformation stage. The proposed OpenSees model can evaluate the seismic behavior of the test columns with good agreement. The lateral behavior of the test columns can be reasonably predicted by using an equivalent stress block and calculation method considering steel bond slip. The literature indicated that the combination of LBHS rebar and fly ash concrete as well as bolted steel tubes is a good alternative for the development of SC RC columns.

本文提出使用水灰比高0.65、455 kg / m ³的混凝土混合粉煤灰和低粘结高强度（LBHS）钢筋，以开发由螺栓钢管约束的弹性圆柱。试验结果表明，所提出的带LBHS钢筋的钢管约束粉煤灰混凝土柱具有很大的自定心（SC）能力，并且在达到大的漂移值之前具有稳定的抗侧向载荷性能。粘结力低会导致纵向钢筋的屈服延迟；因此，与具有普通高粘结力钢筋的色谱柱相比，该色谱柱具有更好的可变形性和持久的SC承载能力。此外，在双曲率柱的反弯段处的锚固连接板对于防止钢筋滑动是必要的。缩短梁柱节点内纵向钢筋的锚固长度对测试柱的抗震性能影响很小。与焊接钢管相比，螺栓钢管可以为测试柱提供更好的安全性，尤其是在大变形阶段。提出的OpenSees模型可以很好地评估测试柱的抗震性能。通过使用等效应力块和考虑钢粘结滑移的计算方法，可以合理地预测测试柱的横向性能。文献表明，LBHS钢筋和粉煤灰混凝土以及螺栓钢管的组合是SC RC柱开发的良好选择。通过使用等效应力块和考虑钢粘结滑移的计算方法，可以合理地预测测试柱的横向性能。文献表明，LBHS钢筋和粉煤灰混凝土以及螺栓钢管的组合是SC RC柱开发的良好选择。通过使用等效应力块和考虑钢粘结滑移的计算方法，可以合理地预测测试柱的横向性能。文献表明，LBHS钢筋和粉煤灰混凝土以及螺栓钢管的组合是SC RC柱开发的良好选择。