Optimal ductility enhancement of RC framed buildings considering different non-invasive retrofitting techniques

Existing RC framed buildings lack significant ductility, especially when they have been built with pre-code criteria. Improving their ductile capacity can help to prevent them from the brittle collapse mechanism and reduce seismic damage expected. This paper aims investigate enhancement of response behaviour considering different non-invasive retrofitting techniques. To do so, a school located in Spanish province Huelva has selected as case study. Five techniques tested: FRP wraps steel jackets columns, beams plates under single braces. They so that be easily implemented building. Some studied detail previous works others included for further research this paper. In order compare results obtained, most typical technique buildings, addition X-bracings bays, also tested. Most studies on are focused validating method based artificial models. compares terms improvement reduction, performing analyses adding an existing A sensitivity analysis carried out determine influence each building’s finite element method. Nonlinear static performed obtain capacity, displacement ductility factor (?) (q) model defined. The expected determined fragile failure elements according Eurocode-8 (EC8) requirements. analyse suitability efficiency solution, benefit/cost ratio obtained taking into account reduction regards costs. shown best benefit However, optimal solutions braces due combination between cost. It observed increase stiffness joints had higher key role resistant structurers. Also, it values fundamental periods reduced, materials, up 30% owing system. Finally, must highlighted detailed whole building conducted avoid additional rotation effects shear forces could worsen behaviour.