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Non‐linear earthquake‐response analysis of long‐span cable‐stayed bridges: Theory
Author(s) -
Nazmy Aly S.,
AbdelGhaffar Ahmed M.
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.4290190106
Subject(s) - structural engineering , girder , bending moment , displacement (psychology) , seismic analysis , tangent , engineering , span (engineering) , stiffness , bridge (graph theory) , modal analysis , finite element method , mathematics , geometry , medicine , psychology , psychotherapist
The non‐linear dynamic analysis of three‐dimensional long‐span cable‐stayed bridges when subjected to seismic loading is formulated. All possible sources of non‐linearity, such as cable sag, axial force‐bending moment interaction in bridge towers and girders and change of geometry of the whole bridge due to large displacements are considered in the analysis. Both cases of uniform and multiple‐support seismic excitations are considered in the non‐linear formulation of the problem. A tangent stiffness, iterative procedure is utilized to capture the the non‐linear seismic response. The non‐linear equations of motion are solved using a step‐by‐step integration technique in the real displacement coordinate space as well as in the modal coordinate space to save computational time.