000018783 001__ 18783
000018783 005__ 20170118182241.0
000018783 04107 $$aeng
000018783 046__ $$k2017-01-09
000018783 100__ $$aCimmino, Maddalena
000018783 24500 $$aSeismic Assessment of Precast Beam-To-Column Connections and Retrofitting Solutions

000018783 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018783 260__ $$b
000018783 506__ $$arestricted
000018783 520__ $$2eng$$aThe inadequacy of beam-to-column connections in RC precast structures can cause catastrophic collapses due, for instance, to loss of support phenomena in the case of absence of mechanical devices. In order to achieve an adequate global seismic capacity, hence, the retrofitting of these connections is a necessary step for existing precast structures. An experimental campaign is performed in order to investigate the seismic behavior of typical beam-to-column connections for precast one-story buildings. The reference connection is a dowel beam-to-column connection, tested under cyclic shear loads up to collapse. It showed a very brittle failure with concrete cover splitting in the column and a non-symmetric behavior for the two loading directions. In particular, for pulling loads (i.e. horizontal loads against the column frontal cover) a significant strength degradation occurs after the attainment of the maximum shear strength, corresponding to the occurrence of the first crack in the column concrete cover. After the cyclic shear test, the described beam-to-column connection was retrofitted. The proposed retrofitting solution is based on two main mechanical principles: the three hinged arch and the dowel effect so that the total seismic force applied to the beam is transferred to the other two hinges on the column by two steel profiles. The cyclic global behavior in terms of force-displacement curve was investigated and the damage patterns after the test were described by means of both visual inspections and instrumentation records. The experimental results demonstrate a good behavior under seismic actions, since no significant damage in the concrete was recorded due to the large concrete covers in the retrofitted system which prevented brittle failures in the connected elements. The horizontal shear force was mostly sustained by the three hinges mechanism, ensured by the two steel profiles under axial loads. Moreover, the comparison between the retrofitted and the dowel beam-to-column connection also allow to define the main critical features of this connection system, as the concrete cover of steel bars in the connected structural elements. The retrofitted connections showed larger shear strength as well as larger dissipated energy values than the standard dowel connection.

000018783 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018783 653__ $$aRC precast buildings; beam-to-column connections; cyclic tests; seismic retrofitting; three-hinged steel system.

000018783 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018783 720__ $$aCimmino, Maddalena$$iMagliulo, Gennaro$$iErcolino, Marianna$$iCapozzi, Vittorio$$iManfredi, Gaetano
000018783 8560_ $$ffischerc@itam.cas.cz
000018783 8564_ $$s1150014$$uhttps://invenio.itam.cas.cz/record/18783/files/2225.pdf$$yOriginal version of the author's contribution as presented on USB, paper 2225.
000018783 962__ $$r16048
000018783 980__ $$aPAPER