Performance Assessment of Steel Structures in Substations Using Nonlinear Time-History Analysis
Md Rezars Mia
MSc Student, School of Civil Engineering, Tianjin University (TJU), Tianjin, 300072, China
Kamal Hosen
PhD Student, School of Ocean and Civil Engineering, Shanghai Jiao Tong University (SJTU), Shanghai, 200240, China
DOI: https://doi.org/10.59429/ear.v3i1.8889
Keywords: Steel structure; Substation; Time-history analysis; Progressive collapse; Performance, evaluation
Abstract
Electrical substations control voltage and the flow of electric energy assuring optimal transmission of electricity from generation plants to users. A detailed performance evaluation of substation’s structures is crucial to take decision regarding demolishing or repairing. To find an efficient assessment strategy, this study a 200 KV substation’s steel structure in China has been analyzed. Structural data and dimensions have been carryout through a holistic site inspection. Different laboratory tests have been conducted to evaluate the materials strength. The finite element method (FEM) has been utilized to develop the structural model, nonlinear static and time-history analysis has been done with STAAD.Pro-2023. To assess the structural safety of the steel structure, necessary factors such as time frequency, mode shape, deflections, and strength capacity ratios were studied. Structural data found from structural analysis as the structures present condition has been compared with its initial conditions and allowable limits. The findings of the study how a 15% reduction in natural frequencies and extended structural periods, indicating material degradation and potential reductions in dynamic resilience. Strength capacity ratio of the steelstructure members found lower than the initial condition.
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