Study on seismic performance and retrofitting of post-tensioned prestressed hybrid frame structures
This paper investigates the seismic damage mechanisms of post-tensioned prestressed hybrid connection (PTHC) joints and the evolution of seismic performance after post-damage reinforcement. For earthquake-damaged PTHC joints, a self-centering prefabricated joint (RSCPC) reinforced with replaceable e...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Editorial Department of Journal of Sichuan University (Engineering Science Edition)
2025-01-01
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| Series: | 工程科学与技术 |
| Subjects: | |
| Online Access: | http://jsuese.scu.edu.cn/thesisDetails#10.12454/j.jsuese.202500227 |
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| Summary: | This paper investigates the seismic damage mechanisms of post-tensioned prestressed hybrid connection (PTHC) joints and the evolution of seismic performance after post-damage reinforcement. For earthquake-damaged PTHC joints, a self-centering prefabricated joint (RSCPC) reinforced with replaceable energy-dissipating components is proposed, and the theoretical hysteresis model of this joint is derived. Compared with equivalent energy-dissipating self-centering joints (EEDRC) reinforced by equivalent energy-dissipating dampers, the RSCPC demonstrates smaller residual deformation and higher load-bearing capacity. Based on low-cycle reversed loading test results, numerical models of PTHC, earthquake-damaged PTHC, RSCPC, and EEDRC frames were established. Incremental dynamic analysis was conducted to comparatively study the collapse probability, residual deformation, and frequency evolution patterns of the four frame types under extremely rare earthquakes. The results indicate that compared with earthquake-damaged PTHC frames, both RSCPC and EEDRC frames effectively restore load-bearing capacity and energy dissipation capability while enhancing seismic performance. Under extremely rare earthquakes, the collapse probability of RSCPC frames decreases by 17.20% compared with EEDRC frames, with post-earthquake residual deformations generally lower than those of EEDRC frames. The seismic performance of earthquake-damaged PTHC frames reinforced with replaceable energy-dissipating dampers shows further improvement over equivalent energy-dissipating damper reinforcement solutions. |
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| ISSN: | 2096-3246 |