SEISMIC FRAGILITY OF INFILLED STEEL BUILDINGS WITH CHEVRON AND X-BRACED CONFIGURATIONS
DOI:
https://doi.org/10.11113/jurnalteknologi.v88.26026Keywords:
Chevron braced frames, X-braced frames, Infill wall, Incremental Dynamic - Push-over Analysis, Fragility curves, Peak ground acceleration.Abstract
The use of bracing frames to resist lateral forces in high seismic regions is essential, as earthquakes can cause severe structural damage and loss of life. This study investigates the interaction between chevron and X-braced steel frames and infill walls, focusing on their seismic fragility. The main objective is to develop and assess fragility curves for twelve two-dimensional structural models subjected to seismic loading. Incremental Dynamic Analysis (IDA) and Push-over Analysis were employed using fifteen ground motion records in SAP2000 to evaluate failure modes, inter-story drift demands, and fragility behavior for models with and without infill walls. Results from the pushover analysis indicate that in concentric braced frames, the initial damage state appears earlier in models with infill walls, while frames without infill experience this state at higher drift levels. Conversely, IDA results reveal that frames without infill walls exhibit greater inter-story drift demands and higher overall capacity than those with infill walls. This suggests that while infill walls contribute to stiffness and reduce drift, they also lead to earlier onset of local damage. Fragility curves developed through statistical analysis demonstrate that two- and three-story frames without infill have a higher probability of reaching the Collapse Prevention (CP) performance level compared to those with infill. However, for taller frames (four to seven stories), the opposite trend is observed. These findings emphasize the complex influence of infill walls on the seismic performance of braced steel structures and provide valuable insights for safer structural design in earthquake-prone regions.
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