Importance of Ductile Confinement in Reinforced Concrete Frames With Structural Fuses


Abstract eng:
In this paper the authors summarize the results obtained, from static nonlinear analyses (pushover), for reinforced concrete intermediate moment-resisting frames (RC-IMRFs), designed with minimum ductile confinement requirements, and with hysteretic energy dissipation devices (HEDDs) mounted in chevron steel bracing which work as structural fuses. Moment-resisting frames, ranged from 5 to 25 stories, were designed using diverse stiffness ratios between the different systems (frames, bracings and hysteretic devices). The first one is the stiffness ratio related between the frame system and the whole structure (α). The second stiffness ratio is 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, based on experimental results. Furthermore, the angle of inclination of the chevron braces with respect to the horizontal axis was taken into account from typical story heights and bay widths used into the Mexican construction practice. 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, favoring satisfactory design mechanisms where the energy dissipation devices develop most of the nonlinearity of the system (structural fuse), while the RC frames remain elastic or develop only incipient yielding exclusively for beams. Also, updated seismic global design parameters are proposed related with the ductility and overstrength that such structures could develop.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 3327.:
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