Seismic Risk Prioritization of Steel Buildings Using Fuzzy Inference System: A Case Study of School Buildings in Selected Regions of Tehran

Document Type : Research Article


1 Graduate Student, School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran

2 School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

3 Zanjan University


The first and most important step in the preparation of seismic retrofit plan for existing buildings is the analysis of their vulnerability by conducting retrofit studies and preparation of qualitative and quantitative vulnerability evaluations. However, most of the existing buildings in Tehran are in urgent need of retrofit studies due to reasons such as high seismicity, up-gradation of building and seismic codes, the abundance of old buildings and so on. In these studies, it is very important to identify the seismic status of the buildings which are in the first priority of seismic retrofit, especially the ones with public use like schools. A seismic risk prioritization technique for steel buildings was proposed in this paper using a risk assessment hierarchical structure and fuzzy inference system. Afterward, this technique was applied in a case study, validating the results obtained for the steel buildings of the schools in Tehran. At the first of the prioritization process, the required information of the buildings was classified according to the designed hierarchical structure; Then, after quantification of the qualitative data and the fuzzification, the data were modeled and defuzzificated based on the fuzzy inference system; This process was performed for all stages of the hierarchical structure to obtain the seismic risk parameter. After the qualification, this parameter indicated the risk of buildings and their requirement for retrofit or rehabilitation. The results that are distinguished by urban districts, determined the high-risk steel school buildings requiring retrofit studies and have shown the role of each effective parameters on the seismic risk of the buildings. These results indicated that among 160 steel school buildings in the studied districts of Tehran, 83 buildings require studies for retrofit or renovation of which 32 school buildings have a more critical situation. Another study also showed that in 6th and 8th districts a high percentage of the school buildings (above 60%) are in high and very high risk status and require special attention.


Main Subjects

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