Seismic Response And Torsional Effects Of RC
Structure With Irregular Plant And Variations In
Diaphragms, Designed With Venezuelan Codes
Author(s)
R. I. Herrera, J. C. Vielma, R. Ugel, A. Alfaro, A. Barbat
& L. Pujades
Abstract
The objective of this study is to determine the seismic response and torsional
effects of an existing Reinforced Concrete building with irregular plant and five
levels projected according to an older version of Venezuelan seismic design
code. Two structures were analysed: the original building and a redesigned
version. Nonlinear static analysis and nonlinear 3D dynamic analysis were
applied, based on registers of three synthetic accelerograms compatible with the
elastic design spectrum for the used code. In 3D analysis, four structures were
simulated, with and without rigid diaphragms so as to compare the seismic
behaviour of the buildings. Through this nonlinear analysis parameters were
determined that define the behaviour of the structure, torsional moments and
rotations in columns reached for simulated buildings. Also, to obtain damage
fragility curves for five states damage were generated. Results show that the
original structure has an inadequate resistant behaviour and a high probability of
exceeding the moderate damage state, while the redesigned structure presents
good performance under seismic events according to the existing code. It was
also observed that maximum torsional effects occur in the entrant corners of the
irregular plant, which are reduced in mid-rise buildings by using a rigid
diaphragm.
Keywords: RC structure, nonlinear analysis, rigid diaphragm, torsional effects.
Keywords
RC structure, nonlinear analysis, rigid diaphragm, torsional effects
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