Abstract

REYES SALAZAR, Alfredo et al. Comportamiento sísmico de edificios de acero con marcos perimetrales resistentes a momento. Ing. sísm [online]. 2010, n.82, pp.57-75. ISSN 0185-092X.

Several issues regarding the structural idealization of steel buildings with perimeter moment resisting steel frames and interior gravity frames (IGFs) are addressed in this paper. The numerical study indicates that the contribution of IGFs to the lateral structural resistance may be significant and that modeling the buildings as plane frames may result in larger resultant stresses, interstory shears and displacements implying that the design may be conservative. It is also observed that the average interstory shear generally increases when the connections stiffness of the IGFs is taken into account. The average interstory displacements are similar for the models with pinned and semi-rigid connections. The results also indicate that the maximum moments at the connections may be up to 30 % of the plastic moments of the beams they are connecting to. In general, the differences observed in the behavior of each structural representation are mainly due to a) the elements that contribute to strength and stiffness, b) the energy dissipation characteristics, and c) the dynamics characteristics of each structural representation. It is concluded that, if the above-mentioned structural system is used, the three-dimensional model should be used in seismic analysis, that the IGFs should be considered as part of the lateral resistance system, and that the stiffness of the connections should be included in the design of the IGFs.

Keywords : semi-rigid connections; steel buildings; moment-resisting frames; gravity frames; no lineal seismic analysis.

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