Model for the assessment of rectangular reinforced concrete columns with limited confinement details
Existing reinforced concrete structures often feature non-seismic or sub-standard transverse reinforcement, typically with poorly anchored 90° hooks. These details limit stirrup and crosstie confinement, leading to premature strength loss or failure. While common in existing structures and sometimes...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
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| Series: | Results in Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123025020572 |
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| Summary: | Existing reinforced concrete structures often feature non-seismic or sub-standard transverse reinforcement, typically with poorly anchored 90° hooks. These details limit stirrup and crosstie confinement, leading to premature strength loss or failure. While common in existing structures and sometimes in new designs, accurately accounting for them is vital for determining the confinement degree, which impacts ductility and ultimate capacity. This work proposes a mechanistic approach for assessing reinforced concrete columns with such limitations. It first develops an analysis-oriented model for predicting the confinement pressure loss in poorly anchored reinforcement, based on static equilibrium and kinematic rules. Secondly, it presents a scheme for a limited confinement constitutive function, considering premature loss, restricted capacity, and section configuration, by adapting existing models. Validation against lateral load tests shows good accuracy in predicting failure points, with less than 10% difference in lateral load capacity and displacement at failure compared to experimental results. |
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| ISSN: | 2590-1230 |