Experimental and analytical studies of reinforced concrete short beams at elevated temperatures
This paper presents an experimental and analytical programme conducted on a total of seven reinforced concrete (RC) short beams, including one test at ambient temperature and six others at elevated temperatures. This study investigates experimentally the behaviour of RC short beams when subjected to...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/154627 |
| _version_ | 1826115301112020992 |
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| author | Fan, Shengxin Zhang, Yao Tan, Kang Hai |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Fan, Shengxin Zhang, Yao Tan, Kang Hai |
| author_sort | Fan, Shengxin |
| collection | NTU |
| description | This paper presents an experimental and analytical programme conducted on a total of seven reinforced concrete (RC) short beams, including one test at ambient temperature and six others at elevated temperatures. This study investigates experimentally the behaviour of RC short beams when subjected to elevated temperatures under the effect of shear-span-to-effective-depth (a/d) ratio and thermal-induced axial restraint. From the literature, this type of study on short beams has not been conducted before. It is experimentally shown that, for unrestrained short beams, as a/d increases, mid-span deflections at failure also increase and failure mode changes from diagonal splitting to shear tension. Besides, the influence of axial restraint on short beams is dependent on a/d ratio. For short beams of small a/d ratios (a/d ≤ 2.00), axial restraint increases mid-span deflections and flexural cracking, whereas it restrains deflections and shortens the failure duration of short beams with a/d ratio of 2.50. Furthermore, regardless of a/d, addition of axial restraint generally shifted the failure mode to a more brittle shear mode at elevated temperatures. Secondly, a simplified analytical model based on strut-and-tie-model (STM) is proposed and verified with test data to predict the performance of RC short beams at high temperatures. This model is applicable to both axially-restrained and unrestrained short beams subjected to elevated temperatures. The proposed STM is capable of providing consistently conservative and safe predictions of temperature profile, axial restraint force, load-carrying capacity and failure duration. |
| first_indexed | 2024-10-01T03:53:15Z |
| format | Journal Article |
| id | ntu-10356/154627 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:53:15Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1546272022-06-09T01:01:49Z Experimental and analytical studies of reinforced concrete short beams at elevated temperatures Fan, Shengxin Zhang, Yao Tan, Kang Hai School of Civil and Environmental Engineering Engineering::Civil engineering Reinforced Concrete Short Beams This paper presents an experimental and analytical programme conducted on a total of seven reinforced concrete (RC) short beams, including one test at ambient temperature and six others at elevated temperatures. This study investigates experimentally the behaviour of RC short beams when subjected to elevated temperatures under the effect of shear-span-to-effective-depth (a/d) ratio and thermal-induced axial restraint. From the literature, this type of study on short beams has not been conducted before. It is experimentally shown that, for unrestrained short beams, as a/d increases, mid-span deflections at failure also increase and failure mode changes from diagonal splitting to shear tension. Besides, the influence of axial restraint on short beams is dependent on a/d ratio. For short beams of small a/d ratios (a/d ≤ 2.00), axial restraint increases mid-span deflections and flexural cracking, whereas it restrains deflections and shortens the failure duration of short beams with a/d ratio of 2.50. Furthermore, regardless of a/d, addition of axial restraint generally shifted the failure mode to a more brittle shear mode at elevated temperatures. Secondly, a simplified analytical model based on strut-and-tie-model (STM) is proposed and verified with test data to predict the performance of RC short beams at high temperatures. This model is applicable to both axially-restrained and unrestrained short beams subjected to elevated temperatures. The proposed STM is capable of providing consistently conservative and safe predictions of temperature profile, axial restraint force, load-carrying capacity and failure duration. Ministry of National Development (MND) National Research Foundation (NRF) The authors wish to acknowledge the first author’s scholarship and the funding for testing from the Singapore Ministry of National Development and National Research Foundation under L2 NIC Award No. L2NICCFP1-2013-4. 2022-06-09T01:01:49Z 2022-06-09T01:01:49Z 2020 Journal Article Fan, S., Zhang, Y. & Tan, K. H. (2020). Experimental and analytical studies of reinforced concrete short beams at elevated temperatures. Engineering Structures, 212, 110445-. https://dx.doi.org/10.1016/j.engstruct.2020.110445 0141-0296 https://hdl.handle.net/10356/154627 10.1016/j.engstruct.2020.110445 2-s2.0-85081154625 212 110445 en L2NICCFP1-2013-4 Engineering Structures © 2020 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Reinforced Concrete Short Beams Fan, Shengxin Zhang, Yao Tan, Kang Hai Experimental and analytical studies of reinforced concrete short beams at elevated temperatures |
| title | Experimental and analytical studies of reinforced concrete short beams at elevated temperatures |
| title_full | Experimental and analytical studies of reinforced concrete short beams at elevated temperatures |
| title_fullStr | Experimental and analytical studies of reinforced concrete short beams at elevated temperatures |
| title_full_unstemmed | Experimental and analytical studies of reinforced concrete short beams at elevated temperatures |
| title_short | Experimental and analytical studies of reinforced concrete short beams at elevated temperatures |
| title_sort | experimental and analytical studies of reinforced concrete short beams at elevated temperatures |
| topic | Engineering::Civil engineering Reinforced Concrete Short Beams |
| url | https://hdl.handle.net/10356/154627 |
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