Spectral Acceleration Amplification Effects on the Performance Point of Self Standing Steel Chimneys

According to developments in construction of special structures in developing countries,current research is carried out on Self Standing Steel Chimneys, which is a kind of special structure and is used in several types of factories. In this research, the 3D finite element model of steel chimneys, previously designed and constructed in Armenia is determined. For this purpose, two finite element models of existing chimneys, supported by a R.C. pile cap and four piles are considered. First model is of 48.0 m high and a diameter of 150cm, whilst the second model’s height is 60m, with a diameter of 200cm.Structural analysis and design is carried out for the fixed based model, due to Armenian SNIP II-2.02-2006 seismic code. Later by performing a Modal Pushover Analysis on estimated finite element models, Capacity Curve for each of them are achieved and the Performance Point according to FEMA 356 guideline recommendations are computed, based on spectral acceleration range of 0.1g~1.0g and above mentioned soil types, using FEMA 356 pseudo acceleration spectrums. considering 4 soil categories of Rock (800