Spectral Acceleration Amplification Effects on The Ductility Demand of Self Standing R.C. Chimneys

Document Type : Original Article


1 Earthquake Engineer, Head of North East branch of BHRC, Mashad, Iran

2 Yerevan Project Co. Yerevan, Armenia


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<Vs<750m/s) and Loose Soil (175<Vs<375m/s) and Very Loose Soil (Vs<175m/s) respectively, taking into account the spectral acceleration level of Sa=0.2g ~1.0g. The Modal Pushover Analysis is carried out as well in order to determine the Yielding Displacment Δy. Finally the ductility demand for all soil categories are computed.


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