Expert opinion on the possibility to consider a seismic behavior coefficient (reducing seismic spectrum) for office buildings after a structural strengthening, in order to justify their resistance at several seismic levels, in the elastic field of materials.
The study consists of the following steps :
• Assessment of the concrete structure : geometry, bracing system, concrete reinforcement. Identification of the strength and weakness in regards to the ductility of the structure.
• Analysis of the strengthening principles considered for the structure.
• Estimate of the ductility that could be mobilised in case of earthquake, and conclusion on the possibility to consider a seismic behavior coefficient, and its value.
• The analysis is based on the following references : Eurocode 8 and Eurocode 2.