RESPONSE OF LONG-SPAN BRIDGES TO SPATIALLY VARYING GROUND MOTION

Results of stationary and transient response analyses to a general spatially varying earthquake ground motion (SVEGM) model are presented for the Golden Gate suspension bridge and the New River Gorge and Cold Spring Canyon deck arch bridges. Results are compared with responses calculated using identical and delayed excitations. Generally, the use of identical excitation is unacceptable for long-span bridges, and the use of delayed excitations is acceptable only for the longitudinal response of short arch bridges. Surprisingly, the transient lateral displacements of the suspension bridge center span substantially overshoot the corresponding stationary displacements for the filtered Kanai-Tajami excitation power spectrum; this spectrum may be inappropriate for analyzing very flexible structures. The qualitative effects of SVEGM on stationary and transient force responses are found to be similar.

Language

  • English

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Filing Info

  • Accession Number: 00723368
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 28 1996 12:00AM