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Steel and Composite Structures Volume 57, Number 6, December 25 2025 , pages 523-539 DOI: https://doi.org/10.12989/scs.2025.57.6.523 |
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Member-level damage identification and FRP strengthening for semi-rigid jointed spatial lattice structures |
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Shu-Hui Huang, Wen-Jie Li, Ze Yang, Ming-Liang Zhu,
Zhi-Wei Shan, Kun Liang and Daniel Ting-Wee Looi
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| Abstract | ||
| Lattice shells rely on axially dominated members where semi-rigid joints are common, yet most damage detection frameworks remain global-level and do not provide design-ready residual capacity at the member level. This study proposes a one-frequency damage quantification method that infers flexural stiffness reduction from the first natural frequency under elastic end restraints, and a semi-rigid–aware capacity model that modifies the Perry–Robertson formulation via a corrected normalized slenderness and a load-correction coefficient τ expressed as a linear function of the dimensionless stiffness ξ=kL2/(EI). The approach is closed with a design workflow that maps damage severity to required FRP retrofit (type, ply number, fiber angle) through equivalent-section transformation. Parametric FEM and external tests demonstrate that: (i) the proposed identification reproduces stiffness loss with errors typically below 2% for semi-rigid and fixed ends; (ii) neglecting joint semi-rigidity yields stability-coefficient errors exceeding 10% for the normalized slenderness ratio higher than 1.3. whereas the modified equation limits errors to ≤2–6% with R2=0.98; and (iii) the retrofit workflow predicts axial capacity gains consistent with validated FEM across 175 cases. The framework enables measure-once member-level diagnosis and design-oriented rehabilitation of lattice structures with semi-rigid joints. | ||
| Key Words | ||
| damage identification; Euler-Bernoulli beam model; FRP strengthening; lattice shell structures; residual axial capacity; semi-rigid joints | ||
| Address | ||
| Shu-Hui Huang:1)Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration; Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management 2) School of Civil Engineering, Southeast University, Nanjing 210096, China Wen-Jie Li:1)Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration; Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management 2) School of Civil Engineering, Southeast University, Nanjing 210096, China Ze Yang:School of Civil Engineering, Southeast University, Nanjing 210096, China Ming-Liang Zhu:School of Civil Engineering, Southeast University, Nanjing 210096, China Zhi-Wei Shan:1)Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration; Key Laboratory of Earthquake Disaster Mitigation, Ministry of Emergency Management 2) School of Civil Engineering, Southeast University, Nanjing 210096, China Kun Liang:Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China Daniel Ting-Wee Looi:Civil Engineering, School of Engineering and Technology, Sunway University, Bandar Sunway, 47500 Selangor, Malaysia | ||