Impact of New Design Codes on Assessment and Redesign of Reinforced Concrete Existing Structures in Seismic Regions

摘要

Theoretical aspects on the risk assessment of the reinforced concrete structures are presented. Theearthquake capacity ratio is analysed for reinforced concrete framed structure. More attention ispaid to the seismic shear force capacity and some new procedures are introduced to estimate theearthquake capacity of existing structures.The present seismic design and assessment of existing structures are done in Romania by using newcodes in agreement with the Eurocodes. The impact of these new design codes in comparison withthe previous codes is presented for reinforced concrete structures.The assessment and rehabilitation were performed on a office building RC framed structure built in1971. The assessment of in-situ conditions showed up the main problems of the RC structure whichconsisted of inadequate concrete strength at some columns. The strengthening solution consisted intransversal confinement with composite fibre reinforced polymers of the columns.