TY  - EJOU
AU  - Zhang, Lu 
AU  - Jia, Guifu 
AU  - Xu, Haowei 
AU  - Zeng, Jian 

TI  - Baseline-Free Damage Localization in Periodic Cable-Net Structures Using a Two-Dimensional Recursive Finite Element Method
T2  - Structural Durability \& Health Monitoring

PY  - 
VL  - 
IS  - 
SN  - 1930-2991

AB  - Large-span cable-net roof systems used in public infrastructure require efficient and reliable inspection or structural health monitoring because local prestress loss is frequently observed, which significantly affects structural safety and mechanical performance. To address the high computational cost of dynamic analysis and over-reliance on baseline in conventional methods, this study proposes a baseline-free damage localization framework for two-dimensional periodic cable-net structures by integrating periodic structural design, recursive finite element analysis, and frequency-response-based identification. First, a square periodic cable-net unit cell with crossed diagonal cables is established, and the two-dimensional dispersion curve considering initial pre-stress is derived based on the Floquet-Bloch theorem. Then, a pre-stressed dynamic model is established, and an efficient two-dimensional recursive finite element method is developed to construct the global dynamic stiffness matrix by recursively assembling a single unit cell, which can significantly reduce the computational degrees of freedom. Local damage is simulated by pre-stress loss in a single cable, and the structural dynamic response is obtained using the frequency response function. Numerical results show that the proposed method can efficiently capture local dynamic changes induced by damage. By comparing the energy variation of adjacent periodic cells within a characteristic frequency band, the damaged cell can be accurately localized without the damage-free baseline model. The proposed framework offers an efficient and promising approach to the online monitoring of large periodic cable-net structures.
KW  - Periodic cable-net; recursive finite element method; baseline-free damage detection; structural health monitoring

DO  - 10.32604/sdhm.2026.082602