Seismic response of retrofitted partially infilled reinforced concrete frames
Also available in printed version
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| Format: | Doctoral thesis |
| Language: | English |
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Universiti Teknologi Malaysia
2025
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| Online Access: | https://utmik.utm.my/handle/123456789/47690 |
| Abstract | Abstract here |
| _version_ | 1854975071337054208 |
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| author | Mahmoud Baniahmadi |
| author2 | Mohammadreza Vafaei, supervisor |
| author_facet | Mohammadreza Vafaei, supervisor Mahmoud Baniahmadi |
| author_sort | Mahmoud Baniahmadi |
| description | Also available in printed version |
| format | Doctoral thesis |
| id | utm-123456789-47690 |
| institution | Universiti Teknologi Malaysia |
| language | English |
| publishDate | 2025 |
| publisher | Universiti Teknologi Malaysia |
| record_format | dspace |
| record_pdf | Abstract |
| spelling | utm-123456789-476902025-08-21T01:05:05Z Seismic response of retrofitted partially infilled reinforced concrete frames Mahmoud Baniahmadi Mohammadreza Vafaei, supervisor Civil engineering Also available in printed version Past earthquakes have demonstrated that infill walls play a significant role in the seismic behavior of reinforced concrete (RC) frames. However, less attention has been paid to the seismic behavior and seismic retrofit of partially infilled RC frames as well as the effect of structural ductility on their seismic response. The main aim of this study was to investigate the effect of a weak partially infilled brick wall on the seismic behavior of low and high ductile RC frames. Two different seismic retrofitting methods for partially infilled RC frames by means of Carbon Fiber Reinforced Polymer (CFRP) were proposed. Six full-scale one-bay single-story RC frames were constructed in which four were partially infilled with brick walls while the other two remained as a bare frame. The RC frames were constructed using two different reinforcement detailings representing ordinary and special ductility classes. All frames were subjected to a quasi-static cyclic loading together with a constant axial force on their columns. For each frame, the applied lateral loads and their corresponding displacements together with the strain values at critical locations were measured at each cycle of loading and compared with each other. Experimental results indicated that the bare frame with special detailing (SBF) had higher ultimate strength and energy dissipation capacity when compared with the Ordinary Bare Frame (OBF) while the difference in their initial stiffness was insignificant. Partially Infilled Special Frame (PISF) showed significantly larger displacement ductility ratio compared to Partially Infilled Ordinary Frame (PIOF). It was observed that in partially infilled frames the ultimate strength and lateral stiffness were influenced significantly by the failure mode of the infill wall. However, the employed reinforcement detailing had insignificant effect on the obtained results. Compared to the bare RC frames, the partially infilled frames exhibited significantly larger initial stiffness and ultimate load. The weak infill brick walls resulted in an improved seismic response for the RC frames. The proposed strengthening methods in this study could enhance the ultimate strength and ductility ratio of a partially infilled ordinary frame up to 23.5% and 43.8%, respectively. In addition, the retrofitted frames exhibited 28% higher energy dissipation and relatively smaller strain values in their reinforcement and concrete when compared with the un-retrofitted frames. The installation of CFRP sheets on the infill wall together with the wrapping of critical zones of columns resulted in a favorable failure mechanism, a higher ultimate strength and energy dissipation. When CFRP sheets were employed for the seismic retrofit of a bare damaged RC frame, it was unable to restore the ductility ratio and energy dissipation capacity of the frame. Results of detailed finite element models showed that increase in the opening height in the partially infilled RC frames decreases their initial stiffness and ultimate strength. fahmimoksen UTM 361 p. Thesis (Doktor Falsafah (Kejuruteraan Awam)) - Universiti Teknologi Malaysia, 2018 2025-03-12T05:56:31Z 2025-03-12T05:56:31Z 2018 Doctoral thesis https://utmik.utm.my/handle/123456789/47690 vital:130027 valet-20191029-140642 ENG Closed Access UTM Complete Unpublished Completion application/pdf Universiti Teknologi Malaysia |
| spellingShingle | Civil engineering Mahmoud Baniahmadi Seismic response of retrofitted partially infilled reinforced concrete frames |
| thesis_level | PhD |
| title | Seismic response of retrofitted partially infilled reinforced concrete frames |
| title_full | Seismic response of retrofitted partially infilled reinforced concrete frames |
| title_fullStr | Seismic response of retrofitted partially infilled reinforced concrete frames |
| title_full_unstemmed | Seismic response of retrofitted partially infilled reinforced concrete frames |
| title_short | Seismic response of retrofitted partially infilled reinforced concrete frames |
| title_sort | seismic response of retrofitted partially infilled reinforced concrete frames |
| topic | Civil engineering |
| url | https://utmik.utm.my/handle/123456789/47690 |
| work_keys_str_mv | AT mahmoudbaniahmadi seismicresponseofretrofittedpartiallyinfilledreinforcedconcreteframes |