000021835 001__ 21835
000021835 005__ 20170622131307.0
000021835 04107 $$aeng
000021835 046__ $$k2017-06-15
000021835 100__ $$aBianco, Vincenzo
000021835 24500 $$aSEISMIC AMELIORATION OF EXISTING REINFORCED CONCRETE BUILDINGS: STRATEGY TO OPTIMIZE THE AMOUNT OF REINFORCEMENT FOR JOINTS

000021835 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021835 260__ $$bNational Technical University of Athens, 2017
000021835 506__ $$arestricted
000021835 520__ $$2eng$$aMost of the existing Reinforced Concrete (RC) buildings in Italy were built according to obsolete regulations that were not enough aware of issues related to seismic design so that they need to be upgraded by pursuing either amelioration or full seismic rehabilitation. In doing that, the first step is to figure out what is, based on the results of the initial analysis of the structure in its ante-operam version, the best overall dissipative mechanism that could be obtained by a number of suitable and economically convenient local interventions. The choice of the overall dissipative mechanism strongly affects the amount of reinforcement to be adopted for the beam-column joints. For new buildings, the current adopted capacity design philosophy pursues an overall beam-sway mechanism in which plastic hinges first form in beams and at last at the base of the columns. On the contrary, for existing ones, often very irregular and gravity-load-dominated, pursuing such overall mechanism may result either uneconomic or even extremely difficult to implement due to the amount of reinforcement to be inserted in the joints. In such cases, an overall dissipative mechanism allowing, at some extent, columns flexural plasticization should be accepted and clearly identified in advance. Anyway, such approach needs to be addressed properly in order to avoid the formation of column-sways at one story only that would result very dangerous due to the excessive demand of plastic rotations on the resulting hinges. This paper presents two simple models that may help the designer in dealing with the operations above. The former is a model that allows to understand if, given the existing RC building case-study, either the beam-sway or a hybrid beam-column-sway mechanism should be conveniently pursued during the design of the retrofitting intervention. The latter is a model that allows to design a hybrid beam-column-sway overall mechanism involving a suitable number of stories such as to guarantee a uniform and reasonable demand of plastic rotations in the involved columns.

000021835 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021835 653__ $$aReinforced Concrete, Existing Buildings, Seismic Amelioration, Design, BeamColumn Joints.

000021835 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021835 720__ $$aBianco, Vincenzo$$iPalmieri, Gianluigi$$iVari, Alessandro$$iMonti, Giorgio
000021835 8560_ $$ffischerc@itam.cas.cz
000021835 8564_ $$s829151$$uhttps://invenio.itam.cas.cz/record/21835/files/18106.pdf$$yOriginal version of the author's contribution as presented on CD, section: [MS29] Repair and Retrofit of Structures
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000021835 962__ $$r21500
000021835 980__ $$aPAPER