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Steel and Composite Structures Volume 39, Number 1, April10 2021 , pages 065-80 DOI: https://doi.org/10.12989/scs.2021.39.1.065 |
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Seismic analysis of high-rise steel frame building considering irregularities in plan and elevation |
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Behzad Mohammadzadeh and Junsuk Kang
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| Abstract | ||
| Irregularities of a building in plan and elevation, which results in the change in stiffness on different floors highly affect the seismic performance and resistance of a structure. This study motivated to investigate the seismic responses of high-rise steel-frame buildings of twelve stories with various stiffness irregularities. The building has five spans of 3200 mm distance in both X- and Z-directions in the plan. The design package SAP2000 was adopted for the design of beams and columns and resulted in the profile IPE500 for the beams of all floors and box sections for columns. The column cross-section dimensions vary concerning the number of the story; one to three: 0.50 X0.50X0.05m, four to seven: 0.45X0.45X0.05 m, and eight to twelve: 0.40X0.40X0.05 m. Real recorded ground accelerations obtained from the Vrancea earthquake in Romania together with dead and live loads corresponding to each story were considered for the applied load. The model was validated by comparing the results of the current method and literature considering a three-bay steel moment-resisting frame of eight-story height subject to seismic load. To investigate the seismic performance of the buildings, the time-history analysis was performed using ABAQUS. Deformed shapes corresponding to negative and positive peaks were provided followed by the story drifts and fragility curves which were used to examine the probability of collapse of the building. From the results, it was concluded that regular buildings provided a seismic performance much better than irregular buildings. Furthermore, it was observed that building with torsional irregularity was more vulnerable to seismic failure. | ||
| Key Words | ||
| seismic load; building irregularity; time history analysis; story drift; fragility curves; high-rise building; steel frame | ||
| Address | ||
| Behzad Mohammadzadeh: School of Civil, Environmental, and Architectural Engineering, Korea University, Seoul 02841, Republic of Korea; Future-Shapers for Solving Global Problem in Construction (BK21 FOUR R&E Center for Civil, Environmental and Architectural Engineering), Korea University, Seoul 02841, Republic of Korea Junsuk Kang: Department of Landscape Architecture and Rural Systems Engineering, Seoul National University, Seoul 08826, Republic of Korea; Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea; Transdisciplinary Program in Smart City Global Convergence, Seoul National University, Seoul 08826, Republic of Korea | ||