Abstract The coupling beam is the key component in high-rise coupled-wall and core-tube structures. To further improve the seismic performance and damage tolerance of traditional reinforced concrete coupling beams, engineered cementitious composites (ECC) becomes a prospective choice, due to the superior characteristics including tension strain-hardening and multi-cracking properties. However, there have been only limited researches on ECC coupling beams, causing the lack of comprehensive understanding of the seismic behaviour and practical design formula. In this study, eight large-scale ECC coupling beam specimens with different aspect ratios, transverse and diagonal reinforcement ratios are fabricated and cyclically tested. The seismic performance of coupling beams is thoroughly investigated in terms of the damage and failure modes, energy dissipation, stiffness deterioration, strength degradation and shear distortion. The contribution of ECC, transverse and diagonal reinforcement to the shear strength is evaluated and compared. Besides, the whole-process hysteretic curves of the axial force are reported for the first time. Finally, a shear strength equation is proposed based on the analysis of nineteen specimens collected from the literature and this study. The test results demonstrate that ECC coupling beams with a hybrid reinforcement layout exhibit superior seismic performance, which is a reasonable choice to balance both the seismic and construction performance. It is strongly recommended that axial force should be considered in the strength prediction of coupling beams, with a 10% axial force ratio suggested for design. The proposed method is verified and can give precise prediction for the bearing capacity of ECC coupling beams.

中文翻译：

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使用具有不同配筋布局的工程水泥基复合材料的连梁的抗震性能和抗剪强度

摘要 连梁是高层耦合墙芯管结构的关键部件。为了进一步提高传统钢筋混凝土连梁的抗震性能和损伤容限，工程水泥基复合材料 (ECC) 成为一种有前景的选择，因为它具有包括拉伸应变硬化和多开裂在内的优异特性。然而，目前对ECC连梁的研究有限，缺乏对抗震性能和实用设计公式的全面了解。在这项研究中，制造了八个具有不同纵横比、横向和对角线配筋率的大型 ECC 连梁试件并进行了循环测试。连梁的抗震性能在损坏和失效模式方面进行了彻底的研究，能量耗散、刚度退化、强度退化和剪切变形。评估和比较 ECC、横向和对角钢筋对剪切强度的贡献。此外，首次报道了轴向力的全过程滞后曲线。最后，在对文献和本研究中收集的 19 个试样进行分析的基础上，提出了剪切强度方程。试验结果表明，采用混合配筋布置的ECC连梁具有优越的抗震性能，是平衡抗震性能和施工性能的合理选择。强烈建议在连梁强度预测中考虑轴力，设计时建议轴力比为10%。