000019681 001__ 19681
000019681 005__ 20170118182331.0
000019681 04107 $$aeng
000019681 046__ $$k2017-01-09
000019681 100__ $$aMelo, Jose
000019681 24500 $$aA Realistic Full Cfrp Retrofit of RC Beam-Column Joints Compared To Seismically Designed Specimens

000019681 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019681 260__ $$b
000019681 506__ $$arestricted
000019681 520__ $$2eng$$aThe brittle collapse of reinforced concrete (RC) structures built before the introduction of detailed seismic design codes (pre1970’s) in recent earthquakes, has underlined the need for significant upgrades to the existing RC building stock. In particular, the observation of weak-column/strong-beam mechanisms has potentially catastrophic impacts that could be addressed by retrofit solutions. Retrofits with fibre reinforced polymers (FRP) have become increasingly popular and experimental evidence for their effectiveness can be found in the literature. The lack of tests on full-scale specimens with slabs and transverse beams in many studies may however lead to an unrealistic assessment of FRP retrofit schemes. In this study, three realistic full-scale interior beam-column joints with slab and transverse beams are tested under cyclic loading in order to propose and assess practical FRP retrofit solutions. A complete Carbon FRP (CFRP) retrofit strategy aiming to obtain a similar performance to a specimen designed to modern European design guidelines (Eurocode 8) is presented. The retrofit scheme is composed of selective strengthening and weakening components to ensure ductile failure of the specimen according to capacity design principles. Results from full-scale cyclic tests on the CFRP retrofitted specimen are compared to the behaviour of a deficient, pre-1970’s design specimen and a specimen designed to modern guidelines. The observed failure mechanisms and global lateral capacities for the Eurocode 8 and retrofitted specimen show that the CFRP retrofit is effective in improving seismic behaviour. By means of a combined selective weakening and strengthening scheme, a change in hierarchy of strengths can be achieved, which leads to an improved ductile behaviour with significant strength enhancement. The results suggest that a CFRP retrofit scheme can be devised for realistic, significantly under-designed structures in order to achieve a similar performance to modern RC structures designed to sophisticated seismic guidelines.

000019681 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019681 653__ $$aFRP; Seismic retrofit; Beam-column joint; Full-scale testing; Existing structures; RC structures

000019681 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019681 720__ $$aMelo, Jose$$iRossetto, Tiziana$$iVarum, Humberto$$iD'Ayala, Dina$$iPohoryles, Daniel
000019681 8560_ $$ffischerc@itam.cas.cz
000019681 8564_ $$s1010425$$uhttps://invenio.itam.cas.cz/record/19681/files/4162.pdf$$yOriginal version of the author's contribution as presented on USB, paper 4162.
000019681 962__ $$r16048
000019681 980__ $$aPAPER