000019257 001__ 19257
000019257 005__ 20170118182307.0
000019257 04107 $$aeng
000019257 046__ $$k2017-01-09
000019257 100__ $$aTena-Colunga, Arturo
000019257 24500 $$aShear Behavior of Continous Reinforced Concrete Haunched Subjected To Cyclic Loading

000019257 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019257 260__ $$b
000019257 506__ $$arestricted
000019257 520__ $$2eng$$aReinforced concrete haunched beams (RCHBs) are structural elements commonly used in buildings and bridges in Mexico and other countries worldwide. For example, in Mexico City there are several midrise buildings with RCHBs (old and recent). It is well known that the shear behavior of RCHBs is quite different from prismatic ones. Nevertheless, Mexican and United States codes do not include specific guides to design them. Based upon previous experimental research studies based upon static and cyclic testing of simply-supported RCHBs deficient in shear, the authors have proposed accurate enough methods to design RCHBs in shear supported by: a) the section approach and, b) strut-and-tie (truss model) approach. However, it is also well known from theory that the contribution of the longitudinal inclined reinforcement of RCHBs in resisting shear is different for a simply supported condition with respect to a continuity condition. To the authors´ knowledge, there are no experimental data available about the cyclic behavior of RC haunched beams deficient in shear tested under a continuity condition. Therefore, in this paper the research results and interpretations of the testing of four prototype continuous reinforced concrete beams (three haunched and one prismatic) designed to develop a shear failure under cyclic loading are presented. Subject beams were tested with minimum shear reinforcement. The studied haunched length is one-third the effective span of the beam. The considered angles of slope of haunch from horizontal vary from 00 (prismatic) to 80. Cyclic tests were displacement-controlled, and two cycles at the same displacement were set in the displacement history which considers a geometrical increment of target displacements. The parameters under study with respect to the shear-resisting mechanism are: (a) the angle of haunch from horizontal and its impact on the concrete strength, (b) the contribution of the inclined longitudinal steel reinforcement and, (c) the contribution of the transverse steel reinforcement. Differences in the cyclic shear behavior of haunched beams with respect to prismatic beams were monitored. Previously proposed design equations were examined, and it was confirmed that these equations allows to reasonably assessing their shear strength for design purposes. The obtained results from the cyclic testing in continuity conditions allow one to corroborate what it was observed in previous testing for simply supported beams: reinforced concrete haunched beams are more efficient than reinforced concrete prismatic beams, even when they fail in shear.

000019257 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019257 653__ $$ahaunched beams, nonprismatic elements, shear strength, deformation capacity, cyclic testing

000019257 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019257 720__ $$aTena-Colunga, Arturo$$iArchundia-Aranda, Hans$$iUrbina-Californias, Luis Angel
000019257 8560_ $$ffischerc@itam.cas.cz
000019257 8564_ $$s1153600$$uhttps://invenio.itam.cas.cz/record/19257/files/3242.pdf$$yOriginal version of the author's contribution as presented on USB, paper 3242.
000019257 962__ $$r16048
000019257 980__ $$aPAPER