The experimental study presented hereis based on the seismic performance investigation of precast reinforced concrete wall panels (PRCWP), post-damage strengthening using different materials and different anchorage systems. Both wall panels have an initial small window opening, but the second panel has the opening enlarged into a large window opening in order to investigate also the cutout effect. The behavior and failure details are presented and analyzed for both unstrengthened and post-damage strengthened situations. The economic aspect will also be discussed for each of the strengthening systems used.

<p>In this paper studies made on seismic retrofitting of reinforced concrete large panels with cut-out openings are presented. There are described the horizontal and vertical loading strategies, the strengthening procedures and the experimental results of the elements strengthened in both prior-to- damage and post-damage states.</p>

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Building structures using Precast Reinforced Concrete Wall Panels (PRCWP) are widely used in Romania. An important disadvantage of these buildings is the functional rigidity of the interior space due to the dense distribution of the load bearing walls. Cut-out openings are often required to facilitate direct access from outside or between adjacent apartments. This paper presents a part of research program regarding the effectiveness of using the Externally Bonded Carbon Fiber Reinforced Polymer (CFRP-EBR) composites as seismic retrofitting solution for PRCWPs weakened by cut-out openings. The discussion was focused on the strengthening strategies adopted for both narrow and wide door openings.