Resumen

UGEL GARRIDO, RONALD DAVID; HERRERA GONZALEZ, REYES INDIRA; PEREZ COLMENARES, SIGRIT DANIELA  y  LOPEZ MACHADO, LEONARDO JOSÉ. PARAMETRIC REVIEW OF SEISMIC RESPONSE OF HIGH RISE STEEL BUILDINGS WITH TWO TYPES OF BRACING SYSTEMS. Saber [online]. 2016, vol.28, n.2, pp.265-278. ISSN 2343-6468.

This study performed the review and comparison of the seismic response of two high-rise steel structural models with dif-ferent bracing systems projected according to Venezuelan seismic code COVENIN 1756 :01 (2001) “Seismic resistant buildings”. Model VI utilized concentrically V-braced steel frames and Model SA used diagonal X-bracing concentrically braces frames. The seismic action was managed in terms of response spectra and buildings were evaluated in terms of demand-capacity. Seismic action used hybrid accelerograms with spectral signals similar to the design spectrum characteristic of the Barquisimeto-Cabudare metropolitan zone in Lara State. The capacity curves were normalized according to the weight of the buildings in order to unify the comparative criteria. The reserve of resistance was compared with an alternative approach based on bilinear representation of capacity and for its evaluation the inelastic static analysis Adaptive Pushover was used. Damage evaluation included probabilistic approach and procedures were applied from the Incremental Dynamic Analysis and the Parametric Capacity Model. Some non-braced frames showed high probability of severe damage or collapse, suffering significant stiffness degradation and lateral deformations beyond normative limits, evidencing that relative displacements and stiffness degradation are fundamental indicators for structural damage. It can be concluded that V-braced model presented a better overall performance than X-braced model, but in both cases non- braced frames showed much greater damage due to dynamic actions.

Palabras clave : V-braced frames; structural models; seismic response; fragility curves; damage models I.