Modern Solutions for Rehabilitation of Old Reinforced Concrete Structures

摘要

The paper deals with the results and design recommendations obtained from an experimentalrnprogramme and its application on a structural rehabilitation.rnThe experimental programme presents the strengthening effect of RC columns by coating with newrnRC jacketing. Methods of increasing bond between old and new concrete are analysed: no bondingrnagent; surface chemical bonding agent; mechanical fixed connectors; chemical fixed connectors.rnThe analysed strengthening solutions are applied on an existing four storeys RC framed structuresrnbuilt in 1940 and located in a seismic zone. The structure presents poor quality concrete, poorrnreinforcement detailing and weakness of reinforcement at present-day magnitude of seismic action.rnAs the owner requirement was to build two more storeys, some rehabilitation solutions werernadopted: RC jacketing of foundations and columns; CFRP jacketing of beams and slabs.