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A platform for research: civil engineering, architecture and urbanism
Seismic behavior of repairable columns with UHPC segments and replaceable buckling-restrained energy dissipaters
https://orcid.org/0000-0001-6072-1887
https://orcid.org/0009-0005-9884-8003
https://orcid.org/0000-0002-3909-3625
Abstract Minimizing earthquake damage and improving repair efficiency are the main principles of resilient structures. The present study proposed a repairable column with UHPC segments and replaceable internal buckling-restrained energy dissipaters. In the UHPC replacement segment, the buckling-restrained energy dissipaters were connected to rebars in other segments through threaded sleeve couplers and could be replaced after an earthquake event. The connected dissipater was unbonded to prevent premature low cycle fatigue failure. A UHPC transition segment was designed to prevent plastic hinge shifting. To evaluate the structural performance of the proposed column, cyclic loading tests were performed on two repairable columns using normal-strength dissipaters or hybrid high- and normal-strength dissipaters before and after repairing. The test results showed that compared with RC columns, the proposed columns exhibited significantly greater strength, deformation capacity, and energy dissipation, as well as low stiffness degradation. Use of high-strength dissipaters improved the strength and energy dissipation, but decreased the deformation capacity. After replacing the dissipaters and cover UHPC, the strengths and energy dissipation of the repaired columns slightly decreased, while the ultimate displacements were almost the same, showing satisfactory seismic resilience. Further, a stress-strain model for the unbonded buckling-restrained energy dissipaters and a flexural strength model for the original and repaired columns were proposed, which were compared with the existing test results.
Highlights A repairable column with UHPC segments and replaceable buckling-restrained energy dissipaters was proposed. The proposed columns exhibited low damage, and buckling of the dissipater was successfully prevented. The proposed columns showed higher strength, ductility, and energy dissipation than RC columns. The strength and ductility of repaired columns were similar to those of the original columns. Flexural strength models for intact and predamaged UHPC columns were proposed.
Seismic behavior of repairable columns with UHPC segments and replaceable buckling-restrained energy dissipaters
https://orcid.org/0000-0001-6072-1887
https://orcid.org/0009-0005-9884-8003
https://orcid.org/0000-0002-3909-3625
Abstract Minimizing earthquake damage and improving repair efficiency are the main principles of resilient structures. The present study proposed a repairable column with UHPC segments and replaceable internal buckling-restrained energy dissipaters. In the UHPC replacement segment, the buckling-restrained energy dissipaters were connected to rebars in other segments through threaded sleeve couplers and could be replaced after an earthquake event. The connected dissipater was unbonded to prevent premature low cycle fatigue failure. A UHPC transition segment was designed to prevent plastic hinge shifting. To evaluate the structural performance of the proposed column, cyclic loading tests were performed on two repairable columns using normal-strength dissipaters or hybrid high- and normal-strength dissipaters before and after repairing. The test results showed that compared with RC columns, the proposed columns exhibited significantly greater strength, deformation capacity, and energy dissipation, as well as low stiffness degradation. Use of high-strength dissipaters improved the strength and energy dissipation, but decreased the deformation capacity. After replacing the dissipaters and cover UHPC, the strengths and energy dissipation of the repaired columns slightly decreased, while the ultimate displacements were almost the same, showing satisfactory seismic resilience. Further, a stress-strain model for the unbonded buckling-restrained energy dissipaters and a flexural strength model for the original and repaired columns were proposed, which were compared with the existing test results.
Highlights A repairable column with UHPC segments and replaceable buckling-restrained energy dissipaters was proposed. The proposed columns exhibited low damage, and buckling of the dissipater was successfully prevented. The proposed columns showed higher strength, ductility, and energy dissipation than RC columns. The strength and ductility of repaired columns were similar to those of the original columns. Flexural strength models for intact and predamaged UHPC columns were proposed.
Seismic behavior of repairable columns with UHPC segments and replaceable buckling-restrained energy dissipaters
https://orcid.org/0000-0001-6072-1887
https://orcid.org/0009-0005-9884-8003
https://orcid.org/0000-0002-3909-3625
Abstract Minimizing earthquake damage and improving repair efficiency are the main principles of resilient structures. The present study proposed a repairable column with UHPC segments and replaceable internal buckling-restrained energy dissipaters. In the UHPC replacement segment, the buckling-restrained energy dissipaters were connected to rebars in other segments through threaded sleeve couplers and could be replaced after an earthquake event. The connected dissipater was unbonded to prevent premature low cycle fatigue failure. A UHPC transition segment was designed to prevent plastic hinge shifting. To evaluate the structural performance of the proposed column, cyclic loading tests were performed on two repairable columns using normal-strength dissipaters or hybrid high- and normal-strength dissipaters before and after repairing. The test results showed that compared with RC columns, the proposed columns exhibited significantly greater strength, deformation capacity, and energy dissipation, as well as low stiffness degradation. Use of high-strength dissipaters improved the strength and energy dissipation, but decreased the deformation capacity. After replacing the dissipaters and cover UHPC, the strengths and energy dissipation of the repaired columns slightly decreased, while the ultimate displacements were almost the same, showing satisfactory seismic resilience. Further, a stress-strain model for the unbonded buckling-restrained energy dissipaters and a flexural strength model for the original and repaired columns were proposed, which were compared with the existing test results.
Highlights A repairable column with UHPC segments and replaceable buckling-restrained energy dissipaters was proposed. The proposed columns exhibited low damage, and buckling of the dissipater was successfully prevented. The proposed columns showed higher strength, ductility, and energy dissipation than RC columns. The strength and ductility of repaired columns were similar to those of the original columns. Flexural strength models for intact and predamaged UHPC columns were proposed.
Seismic behavior of repairable columns with UHPC segments and replaceable buckling-restrained energy dissipaters
Ma, Gao (author) / Hou, Chunxu (author) / Hwang, Hyeon-Jong (author) / Chen, Linghui (author) / Zhang, Zhenhao (author)
Engineering Structures ; 300
2023-11-13
Article (Journal)
Electronic Resource
English
Seismic behavior of replaceable steel truss coupling beams with buckling restrained webs
| Online Contents | 2015