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NUMBER OF MODES FOR THE SEISMIC DESIGN OF BUILDINGS
Author(s) -
LÓPEZ O. A.,
CRUZ M.
Publication year - 1996
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/(sici)1096-9845(199608)25:8<837::aid-eqe585>3.0.co;2-l
Subject(s) - seismic analysis , structural engineering , parametric statistics , response spectrum , ground motion , mode (computer interface) , function (biology) , ideal (ethics) , relation (database) , engineering , simple (philosophy) , component (thermodynamics) , computer science , mathematics , statistics , philosophy , physics , thermodynamics , epistemology , database , evolutionary biology , biology , operating system
The effect of higher modes on the maximum response of buildings subjected to one horizontal component of earthquake ground motion is discussed with the objective of developing better design formulas for use in building design. Ideal buildings of different numbers of storeys and structural systems are defined; their dynamic properties that define higher mode contribution are identified and are shown to be representative of real buildings. Design formulas that give the required number of modes to be used in a dynamic analysis are developed from parametric studies as a function of the admissible error, the number of storeys and the relation between the fundamental period and the corner spectrum period. The recommendations are simple to use and more rational and accurate than the ones actually in use in most seismic design codes.