SEISMIC RELIABILITY FUNCTIONS OF BUILDINGS WITH TORSIONAL ECCENTRICITIES VARYING ALONG THEIR HEIGHT
DOI:
https://doi.org/10.18867/ris.109.625Keywords:
seismic reliability, irregular structures, regular system, correction factorsAbstract
Codified regulations for earthquake resistant design in Mexico City during the last years (2004, 2017, 2020) specify corrective factors that must be applied to the response spectra adopted for the design of irregular buildings. The requirements adopted to consider that a building structure is regular are essentially based on the experience derived from observations about the behavior of such systems, subjected to previous high-intensity seismic excitations. According with these requirements, a structure is classified as irregular if it does not comply with one or several of these requirements. In order to take into account the influence of the degree of irregularity on the spectral ordinates that must be adopted to achieve a performance level similar to that corresponding to a regular system of equal fundamental period, a set of corrective factors are specified, to be applied to the response reduction factor Q'. These values were established on the basis of engineering judgement; therefore, it is necessary to revise them on the basis of seismic response studies oriented to attaining in the irregular systems reliability levels that are consistent with those implicit for their corresponding reference regular systems. This study is focused on irregular buildings, characterized by plan dimension variable along their height, which lead to variable torsional eccentricities along it. A new criterion is established for the determination of reliability functions of buildings with the mentioned types of irregularities; they are applied to several specific cases to be used as basis for the development of parametric studies about the influence of different global properties on the corrective factors necessary to generate seismic design spectra leading to equal reliability levels.
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