Innovative Seismic Strengthening Techniques to Be Used in RC Beams’ Critical Zones
Abstract
:1. Introduction
2. Significant Research Studies
3. Experimental Program
3.1. Specimens’ Description
3.2. Strengthened Specimens’ Description
3.3. Test Setup
3.4. Displacement History
4. Test Results
4.1. Failure Mechanisms
4.2. Experimental Results
4.3. Performance Evaluation
5. Theoretical Prediction
5.1. Determination of the Yield Bending Capacity
5.2. Determination of the Peak Bending Moment Capacity
5.3. Determination of the Deformation Capacity
5.4. Proposed Multilinear Model
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Specimen | Description | Initial Post-Tensioning Force (kN) | UFRG Jacketing |
---|---|---|---|
S1 | Reference | - | - |
S2 | Strengthened with external PT | 300 | - |
S3 | Strengthened with UFRG jacketing + external PT | 300 | 20 mm thickness |
Description | Fmax (kN) | Fmax/ FS1 | Displacement Ductility | Residual Deformation | Energy Dissipation | ||||
---|---|---|---|---|---|---|---|---|---|
µ− (*) | µ+ (*) | dr (mm) | dr/drS1 | W (kNm) | W/WS1 | ||||
S1 | Reference | 212.50 | - | 10.40 | - | 126.20 | - | 28.60 | - |
S2 | PT | 260.10 | 1.22 | 7.70 | 2.40 | 71.20 | 0.56 | 43.80 | 1.53 |
S3 | PT + UFRG | 293.00 | 1.38 | 6.40 | 6.10 | 58.70 | 0.47 | 57.20 | 2.00 |
x (m) | εc (‰) | My (kNm) | My, exp (kNm) | D (%) | |
---|---|---|---|---|---|
S1 | 0.15 | 1.10 | 277.80 | 303.30 | 8 |
S2 | 0.18 | 1.50 | 353.70 | 375.30 | 6 |
S3 | 0.17 | 1.10 | 384.60 | 413.60 | 7 |
x (m) | εS (%) | Mmax (kNm) | Mmax,exp (kNm) | D (%) | |
---|---|---|---|---|---|
S1 | 0.07 | 1.90 | 311.70 | 318.80 | 2 |
S2 | 0.10 | 1.20 | 392.30 | 390.20 | −1 |
S3 | 0.08 | 2.40 | 425.00 | 439.50 | 3 |
1/ry (m−1) | 1/ru (m−1) | dy* (m) | dplast (m) | du (m) | θ = d/L (%) | θexp (%) | |
---|---|---|---|---|---|---|---|
S1 | 0.0075 | 0.155 | 0.005 | 0.060 | 0.065 | 4.4 | 8.0 (*) |
S2 | 0.0084 | 0.171 | 0.006 | 0.066 | 0.072 | 4.8 | 5.3 |
S3 | 0.0076 | 0.148 | 0.006 | 0.057 | 0.063 | 4.2 | 5.0 |
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Gião, R.; Lúcio, V.; Chastre, C. Innovative Seismic Strengthening Techniques to Be Used in RC Beams’ Critical Zones. Buildings 2023, 13, 95. https://doi.org/10.3390/buildings13010095
Gião R, Lúcio V, Chastre C. Innovative Seismic Strengthening Techniques to Be Used in RC Beams’ Critical Zones. Buildings. 2023; 13(1):95. https://doi.org/10.3390/buildings13010095
Chicago/Turabian StyleGião, Rita, Válter Lúcio, and Carlos Chastre. 2023. "Innovative Seismic Strengthening Techniques to Be Used in RC Beams’ Critical Zones" Buildings 13, no. 1: 95. https://doi.org/10.3390/buildings13010095