Open AccessPUSHOVER ANALYSIS OF ASYMMETRIC THREE‐DIMENSIONAL BUILDING FRAMES
Author(s) -
Rui Barros,
Ricardo M. S. F. Almeida
Publication year - 2005
Publication title -
journal of civil engineering and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.529
H-Index - 47
eISSN - 1822-3605
pISSN - 1392-3730
DOI - 10.3846/13923730.2005.9636327
Subject(s) - structural engineering , vibration , stiffness , mode (computer interface) , response spectrum , normal mode , structural load , computer science , engineering , acoustics , physics , operating system
The effect of higher modes of vibration on the total non‐linear dynamic response of a structure is a very important and unsolved problem. To simplify the process the static non‐linear pushover analysis was proposed associated with the capacity spectrum method, utilising a load pattern proportional to the shape of the fundamental mode of vibration of the structure. The results of the pushover analysis, with this load pattern, are very accurate for structures that respond primarily in the fundamental mode. But when the higher modes of vibration become important for the total response of the structure, this load pattern loses its accuracy. To minimise this problem a new multimode load pattern is proposed based on the relative participation of each mode of vibration in the elastic response of a structure subjected to an earthquake ground motion. This load pattern is applied to the analyses of symmetric frames as well as to stiffness asymmetric and mass asymmetric irregular building frames, under seismic actions of distinct orientations, permitting to draw significant conclusions.