Resumen

HERNANDEZ, Julio J.  y  LOPEZ, Oscar A.. EVALUATION OF COMBINATION RULES WITH TWO HORIZONTAL AND ONE VERTICAL SEISMIC COMPONENTS. IMME [online]. 2002, vol.40, n.3, pp.1-18. ISSN 0376-723X.

ABSTRACT     Responses r_e, given by several multicomponent combination rules used in seismic codes, are evaluated for the case when one principal seismic component is vertical and two horizontal principal components can act along any direction. Seismic motions are described by code pseudoacceleration spectra. The SRSS-, 30%-, 40%- and one of the IBC- rules are examined.     Critical response r_cr, the largest one for all possible incident angles of the seismic components, is obtained by means of the CQC3-rule. The upper and lower bounds of ratio r_e/r_cr are presented as a function of the spectral intensity ratio of the horizontal principal components and of the responses to one seismic component acting along each structural axis. Analytical expressions are developed for the extreme bounds of the ratio r_e/r_cr, given a fixed spectral intensity ratio.

Palabras clave : combination rules; multicomponent ground motions; seismic codes; critical response; CQC3; vertical seismic component.