Seismic vulnerability evaluation of a 32-story reinforced concrete building

Seismic evaluation of a 32-story reinforced concrete framed tube building i s performed by checking damageability, safety, and toughness limit states. The evaluation is based on Standard 2800 (Iranian seismic code) which recom mends equivalent lateral static force, modal superposition, or time history dynamic analysis methods to be applied. A three dimensional linearly elast ic model checked by ambient vibration test results is used for the evaluati on. Accelerograms of three earthquakes as well as linearly elastic design r esponse spectra are used for dynamic analysis. Damageability is checked by considering story drift ratios. Safety is evaluated by comparing demands an d capacities at the story and element force levels. Finally, toughness is s tudied in terms of curvature ductility of members. The paper explains the m ethodology selected and various aspects in detail.