Details
| Originalsprache | Englisch |
|---|---|
| Aufsatznummer | 121006 |
| Fachzeitschrift | Engineering structures |
| Jahrgang | 343 |
| Frühes Online-Datum | 30 Juli 2025 |
| Publikationsstatus | Veröffentlicht - Nov. 2025 |
Abstract
bridges. However, cracking damage in hinge joints is a common issue. This study proposes a novel transverse
local prestress strengthening method using self-prestressing iron-based shape memory alloy (Fe-SMA) bars to
repair damaged hinge joints. To validate the method, a scaled model (1:4) comprising six hollow slab beams was
constructed, with artificial damage introduced into one hinge joint. Load tests were conducted to evaluate lateral
load distribution patterns before damage, after damage, and post-repair using the proposed method, followed by
an ultimate failure test. A finite element parametric analysis was also performed. Results indicated that before
damage, transverse load transfer between slab beams was efficient. After hinge joint damage, load transfer efficiency
dropped significantly, and the lateral load distribution factor (LLDF) and strain transverse distribution
factor (STDF) exhibited irregular variations under different loading conditions. Following repair, LLDF and STDF
distributions became more uniform, exceeding the initial state. Moreover, the transverse connection stiffness of
the repaired hinge joint surpassed its original condition, and the relative displacement between slab beams
decreased by 20.1–85.4 % under loading. Finite element parametric analysis revealed that reducing Fe-SMA bar
spacing and increasing recovery stress could further improve repair effectiveness. The findings confirm that the
proposed Fe-SMA-based transverse local prestress method effectively restores and strengthens damaged hinge
joints, significantly enhancing the transverse connection in hollow slab bridges.
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in: Engineering structures, Jahrgang 343, 121006, 11.2025.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Fe-SMA prestressed strengthening of damaged transverse hinge joints in hollow slab bridges
AU - Dong, Zhiqiang
AU - Zou, Cui
AU - Sun, Xinliang
AU - Zhan, Xihua
AU - Zhu, Hong
AU - Pan, Yijie
AU - Ghafoori, Elyas
N1 - Publisher Copyright: © 2025 Elsevier Ltd
PY - 2025/11
Y1 - 2025/11
N2 - The hinge joint is crucial for enabling transverse load transfer between slab beams in hollow slab concretebridges. However, cracking damage in hinge joints is a common issue. This study proposes a novel transverselocal prestress strengthening method using self-prestressing iron-based shape memory alloy (Fe-SMA) bars torepair damaged hinge joints. To validate the method, a scaled model (1:4) comprising six hollow slab beams wasconstructed, with artificial damage introduced into one hinge joint. Load tests were conducted to evaluate lateralload distribution patterns before damage, after damage, and post-repair using the proposed method, followed byan ultimate failure test. A finite element parametric analysis was also performed. Results indicated that beforedamage, transverse load transfer between slab beams was efficient. After hinge joint damage, load transfer efficiencydropped significantly, and the lateral load distribution factor (LLDF) and strain transverse distributionfactor (STDF) exhibited irregular variations under different loading conditions. Following repair, LLDF and STDFdistributions became more uniform, exceeding the initial state. Moreover, the transverse connection stiffness ofthe repaired hinge joint surpassed its original condition, and the relative displacement between slab beamsdecreased by 20.1–85.4 % under loading. Finite element parametric analysis revealed that reducing Fe-SMA barspacing and increasing recovery stress could further improve repair effectiveness. The findings confirm that theproposed Fe-SMA-based transverse local prestress method effectively restores and strengthens damaged hingejoints, significantly enhancing the transverse connection in hollow slab bridges.
AB - The hinge joint is crucial for enabling transverse load transfer between slab beams in hollow slab concretebridges. However, cracking damage in hinge joints is a common issue. This study proposes a novel transverselocal prestress strengthening method using self-prestressing iron-based shape memory alloy (Fe-SMA) bars torepair damaged hinge joints. To validate the method, a scaled model (1:4) comprising six hollow slab beams wasconstructed, with artificial damage introduced into one hinge joint. Load tests were conducted to evaluate lateralload distribution patterns before damage, after damage, and post-repair using the proposed method, followed byan ultimate failure test. A finite element parametric analysis was also performed. Results indicated that beforedamage, transverse load transfer between slab beams was efficient. After hinge joint damage, load transfer efficiencydropped significantly, and the lateral load distribution factor (LLDF) and strain transverse distributionfactor (STDF) exhibited irregular variations under different loading conditions. Following repair, LLDF and STDFdistributions became more uniform, exceeding the initial state. Moreover, the transverse connection stiffness ofthe repaired hinge joint surpassed its original condition, and the relative displacement between slab beamsdecreased by 20.1–85.4 % under loading. Finite element parametric analysis revealed that reducing Fe-SMA barspacing and increasing recovery stress could further improve repair effectiveness. The findings confirm that theproposed Fe-SMA-based transverse local prestress method effectively restores and strengthens damaged hingejoints, significantly enhancing the transverse connection in hollow slab bridges.
KW - Damaged hinge joint
KW - Fe-SMA bars
KW - Lateral load distribution factor
KW - Local prestress
KW - Scaled-hollow slab bridges
UR - http://www.scopus.com/inward/record.url?scp=105011935825&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2025.121006
DO - 10.1016/j.engstruct.2025.121006
M3 - Article
VL - 343
JO - Engineering structures
JF - Engineering structures
SN - 0141-0296
M1 - 121006
ER -