Performance-based evaluation of tall buildings using advanced intensity measures (case study: 30-story steel structure with framed-tube system)

Performance assessment of high-rise buildings has attracted peculiar attention among engineers. Care should be taken once higher-mode effects are to be incorporated into analyses and designs. Recently, performance-based evaluations have been widely used by designers to meet the required target capacities of engineering projects. A common tool to perform such studies is incremental dynamic analysis (IDA), which has been utilized for first-mode-dominant ordinary structures, whereas taller buildings demand other considerations to be made so that a thorough assessment of the structural response can be achieved. In this paper, performance-based studies have been carried out for a sample 30-story tall building, which takes advantage of tubular frame as lateral-load-resisting system. IDA is performed subsequently to quantify the structural response against a wide-range of seismic loadings. Advanced intensity measures (IMs) are applied to optimize the capacity assessments resulting from multitude of non-linear time-history analyses. Finally, performance-based evaluations have been carried out to provide a thorough assessment of target capacities that are normally advised by widely accepted codes. Results are also compared with regular short buildings where higher-mode effects do not contribute significantly to structural response. Copyright (c) 2012 John Wiley & Sons, Ltd.