Progressive collapse behaviour of earthquake-damaged interior precast concrete joints with headed bars and plastic hinge relocation
This study investigated progressive collapse behaviour of earthquake-damaged interior precast concrete (PC) joints with headed bars. The main objective was to quantify the impact of slight and moderate earthquake damage on their residual collapse resistance. The research began with a numerical inves...
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Online Access: | https://hdl.handle.net/10356/175802 |
| _version_ | 1811681930575347712 |
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| author | Nguyen, Van Hung Tan, Kang Hai |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Nguyen, Van Hung Tan, Kang Hai |
| author_sort | Nguyen, Van Hung |
| collection | NTU |
| description | This study investigated progressive collapse behaviour of earthquake-damaged interior precast concrete (PC) joints with headed bars. The main objective was to quantify the impact of slight and moderate earthquake damage on their residual collapse resistance. The research began with a numerical investigation to understand the interaction between a 2D frame's global response to seismic loading and its local response during a threat-independent progressive collapse event. Additionally, a separate set of numerical studies examined interior PC joints under cyclic loading to determine maximum drift ratio demands, yielding 2.5% for slightly and 3.5% for moderately damaged joints. Subsequently, an experimental programme under quasi-static loading conditions was conducted on five interior PC joints under cyclic loading, followed by progressive collapse resistance tests. Test results indicated that damaged joints exhibited flexural and catenary action during progressive collapse, but compressive arch action could not be mobilised due to residual cracks from the initial cyclic loading phase. Comparing damaged joints to fully intact ones from a companion study revealed deterioration in stiffness and deformation capacity during a subsequent progressive collapse, with degree of severity proportional to the extent of damage sustained in the cyclic loading phase. Relative to the intact joints without being subjected to cyclic loading, moderately damaged specimens exhibited a degradation of 63% in stiffness and 38% in deformation capacity, compared to slightly damaged specimens, which showed reductions of 38% in stiffness and 28% in deformation capacity. In contrast, strain hardening of steel bars in both slightly and moderately damaged specimens led to slightly greater collapse resistance than the intact joints. Additionally, failure mode shifted from ductile fracture to premature pull-through failure of headed bars in moderately damaged specimens. In this regard, in post-earthquake progressive collapse assessment, it is recommended to use maximum crack width thresholds of 0.2 to 1.0 mm for slight damage and 1.0 to 2.0 mm for moderate damage. |
| first_indexed | 2024-10-01T03:48:46Z |
| format | Journal Article |
| id | ntu-10356/175802 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:48:46Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1758022024-05-07T00:55:10Z Progressive collapse behaviour of earthquake-damaged interior precast concrete joints with headed bars and plastic hinge relocation Nguyen, Van Hung Tan, Kang Hai School of Civil and Environmental Engineering Engineering Reduction factors Residual capacity This study investigated progressive collapse behaviour of earthquake-damaged interior precast concrete (PC) joints with headed bars. The main objective was to quantify the impact of slight and moderate earthquake damage on their residual collapse resistance. The research began with a numerical investigation to understand the interaction between a 2D frame's global response to seismic loading and its local response during a threat-independent progressive collapse event. Additionally, a separate set of numerical studies examined interior PC joints under cyclic loading to determine maximum drift ratio demands, yielding 2.5% for slightly and 3.5% for moderately damaged joints. Subsequently, an experimental programme under quasi-static loading conditions was conducted on five interior PC joints under cyclic loading, followed by progressive collapse resistance tests. Test results indicated that damaged joints exhibited flexural and catenary action during progressive collapse, but compressive arch action could not be mobilised due to residual cracks from the initial cyclic loading phase. Comparing damaged joints to fully intact ones from a companion study revealed deterioration in stiffness and deformation capacity during a subsequent progressive collapse, with degree of severity proportional to the extent of damage sustained in the cyclic loading phase. Relative to the intact joints without being subjected to cyclic loading, moderately damaged specimens exhibited a degradation of 63% in stiffness and 38% in deformation capacity, compared to slightly damaged specimens, which showed reductions of 38% in stiffness and 28% in deformation capacity. In contrast, strain hardening of steel bars in both slightly and moderately damaged specimens led to slightly greater collapse resistance than the intact joints. Additionally, failure mode shifted from ductile fracture to premature pull-through failure of headed bars in moderately damaged specimens. In this regard, in post-earthquake progressive collapse assessment, it is recommended to use maximum crack width thresholds of 0.2 to 1.0 mm for slight damage and 1.0 to 2.0 mm for moderate damage. The authors would like to gratefully acknowledge the funding entitled “Precast progressive collapse testing programme” as part of the Changi East development programme, which is provided by Changi Airport Group of Singapore. Award No. NTU Ref: 2018–1451. Any opinions, findings, and conclusions expressed in this paper are those of the authors and do not necessarily reflect the view of Changi Airport Group of Singapore. 2024-05-07T00:55:10Z 2024-05-07T00:55:10Z 2024 Journal Article Nguyen, V. H. & Tan, K. H. (2024). Progressive collapse behaviour of earthquake-damaged interior precast concrete joints with headed bars and plastic hinge relocation. Engineering Structures, 306, 117817-. https://dx.doi.org/10.1016/j.engstruct.2024.117817 0141-0296 https://hdl.handle.net/10356/175802 10.1016/j.engstruct.2024.117817 2-s2.0-85187957479 306 117817 en NTU Ref: 2018–1451 Engineering Structures © 2024 Published by Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering Reduction factors Residual capacity Nguyen, Van Hung Tan, Kang Hai Progressive collapse behaviour of earthquake-damaged interior precast concrete joints with headed bars and plastic hinge relocation |
| title | Progressive collapse behaviour of earthquake-damaged interior precast concrete joints with headed bars and plastic hinge relocation |
| title_full | Progressive collapse behaviour of earthquake-damaged interior precast concrete joints with headed bars and plastic hinge relocation |
| title_fullStr | Progressive collapse behaviour of earthquake-damaged interior precast concrete joints with headed bars and plastic hinge relocation |
| title_full_unstemmed | Progressive collapse behaviour of earthquake-damaged interior precast concrete joints with headed bars and plastic hinge relocation |
| title_short | Progressive collapse behaviour of earthquake-damaged interior precast concrete joints with headed bars and plastic hinge relocation |
| title_sort | progressive collapse behaviour of earthquake damaged interior precast concrete joints with headed bars and plastic hinge relocation |
| topic | Engineering Reduction factors Residual capacity |
| url | https://hdl.handle.net/10356/175802 |
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