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Seismic performance of semi-precast high-strength recycled concrete columns with ultra-high-strength steel bar
The purpose of this study is to promote the application of high-strength reinforcement and recycled aggregate concrete in post-earthquake repairable precast structures. Three large-scale recycled concrete columns with ultra-high-strength steel bar were designed and tested under quasi-static cyclic loads. The feasibility of semi-precast columns is verified, i.e., the concrete shell of the outer tube is precast first, and then the precast external shell is used as a formwork to cast concrete into the tube. The design parameters include axial load and the addition of steel fibers. The results indicate that all specimens exhibited a good deformation capacity with an ultimate drift ratio greater than 4%. Increasing axial load will increase the lateral load capacity of the specimen by 21%, while the deformability and repairability decrease. Adding steel fibers to the precast external shell can increase the lateral load capacity by 10%, as well as the deformability and repairability of the specimen. Due to the low bond strength of ultra-high-strength steel bar, it slips at the column footing in the tensile side. Eventually, the fiber-based model simplified flexural capacity calculation model considering the ultra-high-strength steel bar slippage in the tensile zone are established.
Seismic performance of semi-precast high-strength recycled concrete columns with ultra-high-strength steel bar
The purpose of this study is to promote the application of high-strength reinforcement and recycled aggregate concrete in post-earthquake repairable precast structures. Three large-scale recycled concrete columns with ultra-high-strength steel bar were designed and tested under quasi-static cyclic loads. The feasibility of semi-precast columns is verified, i.e., the concrete shell of the outer tube is precast first, and then the precast external shell is used as a formwork to cast concrete into the tube. The design parameters include axial load and the addition of steel fibers. The results indicate that all specimens exhibited a good deformation capacity with an ultimate drift ratio greater than 4%. Increasing axial load will increase the lateral load capacity of the specimen by 21%, while the deformability and repairability decrease. Adding steel fibers to the precast external shell can increase the lateral load capacity by 10%, as well as the deformability and repairability of the specimen. Due to the low bond strength of ultra-high-strength steel bar, it slips at the column footing in the tensile side. Eventually, the fiber-based model simplified flexural capacity calculation model considering the ultra-high-strength steel bar slippage in the tensile zone are established.
Seismic performance of semi-precast high-strength recycled concrete columns with ultra-high-strength steel bar
Tao, Xinyi (author) / Zhang, Jianwei (author) / Zhang, Man (author) / Cao, Wanlin (author)
European Journal of Environmental and Civil Engineering ; 27 ; 831-859
2023-01-25
29 pages
Article (Journal)
Electronic Resource
Unknown
| SAGE Publications | 2020
| Taylor & Francis Verlag | 2024
| Taylor & Francis Verlag | 2023