spectral acceleration amplification effects on the ductility demand of self-standing r.c. chimneys

According to construction of industrial structures in developing countries, current research is carried out on self standing reinforced concrete chimneys, which are a sort of special structures and is used in several types of factories. for this purpose, the 3d model of an existing reinforced concrete chimney of 80.0 m high and a diameter of 4.0 ~5.0 m in armenia, is modeled and analyzed using spectral analysis procedure according to 4th revision of iranian 2800 seismic code, taking into account the spectral acceleration level to sa=0.4g. on the next step, the finite element model is analysed by the means of time history analysis method, using 3 pairs of accelerograms recorded on each soil categories of rock (vs>750m/s), dense soil (375