Investigating the Performance of High-rise Steel Structures with Tube Systems under the Effect of Progressive Failure

The objective of this study is to analyze the behavior of high-rise buildings with tubular systems under critical column removal (corner and mid-span) using nonlinear dynamic analysis. The performance of these buildings was assessed against lateral loads such as earthquakes and winds, particularly in column removal scenarios. Nonlinear dynamic analysis was performed on ۱۰, ۲۰, and ۳۰-story buildings with different tubular systems, including those with steel shear walls, shear cores, and braces. The results showed that in ۱۰-story buildings, the system with steel shear walls experienced ۶۵ mm displacement in the corner column removal scenario and ۷۵ mm in the mid-span column removal scenario. In ۳۰-story buildings, the shear core system had ۱۵۹ mm and ۱۶۱ mm displacements in the corner and mid-span column removal scenarios, respectively. The simple tubular system had the highest displacements, particularly in the mid-span removal scenario (۱۰۰ mm in ۳۰-story buildings). In this scenario, the number of plastic hinges decreased from ۷۰ to ۶۵ in the system with steel shear walls and from ۹۸ to ۸۳ in the unreinforced system. The "Braced Tube" system was the most resilient in ۲۰-story buildings, reducing plastic hinges from ۱۵۲ to ۱۴۳, with the greatest reduction at the Immediate Occupancy (IO) performance level observed in the "Classified Tube" and "Braced Tube" systems.

کلیدواژه ها:

moving floors ، plastic joint ، Alternative Load Path Method ، Tube System