Resumo

NANGULLASMU HERNANDEZ, Horacio de Jesús  e  TENA COLUNGA, Arturo. Minimum ductile confinement requirements in reinforced concrete frames protected with hysteretic energy dissipation devices. Ing. sísm [online]. 2016, n.95, pp.1-32. ISSN 0185-092X.

In this paper the authors summarize results obtained from pushover analyses for reinforced concrete intermediate moment-resisting frames (RC-IMRFs) with hysteretic energy dissipation devices (HEDDs), mounted in chevron steel bracing. The global structural efficiency was evaluated for the RC-IMRFs designed with minimum ductile confinement requirements as an additional design request specified in the reinforced concrete guidelines of Mexican codes. Moment-resisting frames ranged from 5 to 25 stories and were designed using diverse stiffness ratios between frame system and the whole structure (α), as well as stiffness ratios between the HEDD and the supporting brace (β). A post to pre yielding stiffness ratio (k2/kEL) of 5% for the hysteretic devices was also considered. An angle of inclination of the chevron braces with respect to the horizontal axis θ= 45° was taken into account. The structural behavior of RC-IMRFs with these extra requirements is much improved with respect of the typical detailing established in Mexican codes for RC-IMRFs. Updated seismic global design parameters related to global ductility (Q) and overstrength (R) that such structures could develop were assessed. Finally, comments related to the use of minimum ductile confinement requirements are exposed with the main objective to induce a “practical” design procedure for this kind of structures.

Palavras-chave : energy dissipation devices; stiffness balances; reinforced concrete frames; ductility; overstrength.

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