Abstract This paper presented a new kind of steel-reinforced engineered cementitious composite (RECC/C) columns, which consisted of a permanent formwork fabricated by the steel-reinforced ECC (RECC) and plain concrete infilled within the RECC formwork. The main objective of this paper was to examine the seismic behavior of the RECC/C columns through experimental and numerical approaches. Six RECC/C composite columns and a corresponding conventional reinforced concrete (RC) column specimen were prepared for the experimental investigations. The test results revealed that the RECC/C composite columns had better shear capacity, energy dissipation capacity, and a higher ductility as compared to the RC column. An increase in the transverse reinforcement, shear-span ratio, or a decrease in the axial compression resulted in the improvement of the ductility and energy dissipation capacity of the RECC/C columns. Numerical modeling of the RECC/C column was carried out based on OpenSees. The parametric studies offered insights into the effects of the longitudinal reinforcement, shear-span ratio, axial compression, ECC compressive strength and ultimate compressive strain, and the thickness of ECC layer/formwork on the flexural behavior of the RECC/C columns. The results showed that an increase in each of those ECC material parameters may be beneficial for the member ductility. An appropriate thickness of the ECC layer was crucial to the flexural behavior of the proposed composite columns.

中文翻译：

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钢增强ECC永久模板与填充混凝土组合柱的抗震性能

摘要 本文提出了一种新型钢增强水泥基复合材料（RECC/C）柱，它由由钢增强ECC（RECC）制成的永久性模板和填充在RECC模板内的素混凝土组成。本文的主要目的是通过实验和数值方法检查 RECC/C 柱的抗震性能。为实验研究准备了六个 RECC/C 复合柱和相应的常规钢筋混凝土 (RC) 柱试样。试验结果表明，与RC柱相比，RECC/C复合柱具有更好的抗剪能力、耗能能力和更高的延性。增加横向钢筋，剪跨比，或轴压的降低导致了 RECC/C 柱的延性和耗能能力的提高。RECC/C 柱的数值模拟是基于 OpenSees 进行的。参数研究提供了对纵向钢筋、剪跨比、轴压、ECC 抗压强度和极限压缩应变以及 ECC 层/模板厚度对 RECC/C 柱弯曲行为的影响的见解。结果表明，增加这些 ECC 材料参数中的每一个都可能有利于构件的延展性。合适的 ECC 层厚度对所提出的复合柱的弯曲行为至关重要。参数研究提供了对纵向钢筋、剪跨比、轴压、ECC 抗压强度和极限压缩应变以及 ECC 层/模板厚度对 RECC/C 柱弯曲行为的影响的见解。结果表明，增加这些 ECC 材料参数中的每一个都可能有利于构件的延展性。合适的 ECC 层厚度对所提出的复合柱的弯曲行为至关重要。参数研究提供了对纵向钢筋、剪跨比、轴压、ECC 抗压强度和极限压缩应变以及 ECC 层/模板厚度对 RECC/C 柱弯曲行为的影响的见解。结果表明，增加这些 ECC 材料参数中的每一个都可能有利于构件的延展性。合适的 ECC 层厚度对所提出的复合柱的弯曲行为至关重要。结果表明，增加这些 ECC 材料参数中的每一个都可能有利于构件的延展性。合适的 ECC 层厚度对所提出的复合柱的弯曲行为至关重要。结果表明，增加这些 ECC 材料参数中的每一个都可能有利于构件的延展性。合适的 ECC 层厚度对所提出的复合柱的弯曲行为至关重要。