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Kinematic soil–structure interaction for long‐span cable‐supported bridges
Author(s) -
Betti R.,
AbdelGhaffar A. M.,
Niazy A. S.
Publication year - 1993
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.4290220505
Subject(s) - kinematics , structural engineering , foundation (evidence) , soil structure interaction , embedment , engineering , geotechnical engineering , bridge (graph theory) , ground motion , suspension (topology) , geology , mathematics , physics , finite element method , classical mechanics , geography , medicine , archaeology , homotopy , pure mathematics
A general procedure is presented to study the dynamic soil–structure interaction effects on the response of long‐span suspension and cable‐stayed bridges subjected to spatially varying ground motion at the supporting foundations. The foundation system is represented by multiple embedded cassion foundations and the frequency‐dependent impedance matrix for the multiple foundations system takes into account also the cross‐interaction among adjacent foundations through the soil. To illustrate the potential implementation of the analysis, a numerical example is presented in which the dynamic response of the Vincent–Thomas suspension bridge (Los Angeles, CA) subjected to the 1987 Whittier earthquake is investigated. Although both kinematic and inertial effects are included in the general procedure, only the kinematic effects of the soil–structure interaction are considered in the analysis of the test case. The results show the importance of the kinematic soil–foundation interaction on the structural response. These effects are related to the type, i.e. SH‐, SV‐, P‐ or Rayleigh waves and to the inclination of the seismic wave excitation. Moreover, rocking components of the foundation motion are emphasized by the embedment of the foundation system and greatly alter the structural response.