Process towers probabilistic seismic behavior evaluation using incremental dynamic analysis

Document Type : Research Article


1 University of Qom

2 Department of Civil Engineering, Qom University, Qom, Iran

3 Department of Civil engineering, Engineering faculty, university of Qom, Qom, Iran

4 International Research Institute of Seismology and Earthquake Engineering, Tehran.


Process towers or vertical vessels are one of the industrial structures that has key role in process of producing oil substances and its derivatives in the petrochemical plants. for seismic analysis of these structures, a case study on a designed and constructed process tower with height equal to 26.5 meters located in the Gheshm island petrochemical plant has been done in this article. Due to considering rigid foundation without soil structure interactions is not a model with close response of the reality, the modeling of the structure has been done in Abaqus finite element software considering soil structure interactions. Winkler model has been used for soil modeling and tower seismic behavior has been analyzed using nonlinear static and dynamic analysis and fragility curves for vulnerability evaluation in various level of seismic intensities has been produced. In this study probable failures like body and skirt and also overturning of structure has been investigated. Considering resulted fragility curves, no bucking saw in the body and skirt of the tower before its overturning. resulted fragility curve for the studied tower, till PGA=0.1g the probability of structure overturning is equal to zero and for PGA=0.35g this probability is less than 20%. But for rare intensities the overturning probability is considerable


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