This research aims to show the procedures and results of Performance Based Seismic Design using Capacity Spectrum Method (CSM) for Ductile Steel Structures. Two 9-story buildings, A and B for examples, which are rigidly jointed steel structures with the same configuration were designed under different seismic performance criteria. Building A was designed to satisfy the minimum requirements, which are described as "Life-safety against severe EQ (earthquake)" and "Serviceability after moderate EQ". Building B was designed to have one more requirement as "Repairability after severe EQ", which indicates higher seismic performance. CSM is the procedure where the demand spectra and the capacity of the structure met in the Acceleration Displacement Response Spectrum (ADRS) format at the performance point, which describes a different level of seismic design criteria. The results were evaluated by the elasto-plastic multi-mass time-history seismic response analyses using real EQ records. The building performance improvement can be done with a slight expense of steel weight.
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