Premium
Response analysis of flexible MDF systems for multiple‐support seismic excitations
Author(s) -
Yamamura Nobumichi,
Tanaka Hiroshi
Publication year - 1990
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/eqe.4290190305
Subject(s) - structural engineering , response spectrum , modal , bridge (graph theory) , uncorrelated , modal analysis , span (engineering) , suspension (topology) , spectrum (functional analysis) , engineering , mathematics , physics , finite element method , statistics , materials science , pure mathematics , medicine , quantum mechanics , polymer chemistry , homotopy
Two practical approaches, response spectrum and time‐history methods, are developed to evaluate the response of flexible multi‐degree‐of‐freedom (MDF) systems, notably long‐span bridges, to multiple‐support seismic excitations. For practical convenience, ground motions within a group of adjacent supports on continuous soil or rock are assumed to be uniform and synchronized, while those of different groups are treated as non‐uniform and uncorrelated. The response spectrum analysis is extended to include the cross‐correlation of modal responses, which prove important when closely spaced modal frequencies exist. An example of the significance of multiple‐support excitations is illustrated by application to a suspension bridge. Qualitatively comparable effects can be expected for other bridges of similar type or dimensions.