000018706 001__ 18706
000018706 005__ 20170118182237.0
000018706 04107 $$aeng
000018706 046__ $$k2017-01-09
000018706 100__ $$aTapia-Hernández, Edgar
000018706 24500 $$aBehavior of Eccentrically Braced Steel Frames of Regular Buildings in Soft Soils

000018706 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018706 260__ $$b
000018706 506__ $$arestricted
000018706 520__ $$2eng$$aResults of nonlinear analyses of 6- and 9-stories regular buildings structured with moment-resisting eccentrically braced steel frames are discussed in this paper. Models were designed following the capacity design principle for a seismic modification factor Q= 4.0, the maximum allowed for these structures, according to the Mexico City Building Code. Nonlinear pushover and dynamic analyses were performed in 3D in OpenSees and were supposed located in soft soil site condition (Mexico City’s lake-bed zone). Dynamic analyses were performed under ten historical records related to the considered design spectra. For this purposes, a detailed model in OpenSees with material and geometrical non-linearities was developed. Nonlinear beam-column elements, with plasticity spread along the element length, were considered for the link beam elements, beam segments outside of the shear links, braces and columns; and a detailed model of the connection at the ends of link elements with springs was considered. A quadratic perturbation shape was used to define the initial camber in the bracing system and an out-of-plumbness of columns was also considered as imperfections in the locations of points of intersection of elements. Through 1,756 certified laboratory coupons test of steel samples a better reference of the actual yielding steel stress was included in order to evaluate the material overstrength capacity at the local market. According to the results, the overall response of the structure was governed by the maximum link rotations by interstory. Top stories reported practically an elastic behavior, whereas peak story drifts were developed at the middle stories, driving potential weak stories under static and dynamic inelastic analyses. Median link rotations went beyond the code limit (0.08 rad). A magnitude of the rotation link capacity is proposed in order to better predict the seismic response, which is based on a statistical study of results of experimental tests with respect to the beam link cross-section. A slight relationship among ductility and building height was noticed.

000018706 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018706 653__ $$aEccentrically braced frames; drift; ductility; material overstrength; soft-story.

000018706 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018706 720__ $$aTapia-Hernández, Edgar$$iGarcía-Carrera, Salvador
000018706 8560_ $$ffischerc@itam.cas.cz
000018706 8564_ $$s499114$$uhttps://invenio.itam.cas.cz/record/18706/files/205.pdf$$yOriginal version of the author's contribution as presented on USB, paper 205.
000018706 962__ $$r16048
000018706 980__ $$aPAPER