Three-Dimensional Response of a Bridge Structure Subjected to Traveling Rayleigh Waves, SV-Waves, and P-Waves

摘要

Results are reported of a research program which investigated the three-dimensional response of structures to spatially varying seismic excitations. A methodology, named CAST-1, was developed to analyze the three-dimensional response of a single-span bridge on an elastic half-space subjected to traveling Rayleigh waves, SV-waves, and P-waves with arbitrary excitation frequencies and angles of incidence. These analyses, when considered with those for SH-waves conducted earlier, show how the bridge response is influenced by each of the various types of seismic waves that propagate through an elastic half-space. Results from bridge analyses demonstrate that nonvertically incident seismic waves induce resonant responses that are different from those induced by vertically incident seismic waves. In addition, important non-resonant response characteristics are seen to be dependent on the wave type, excitation frequency, an the angles of horizontal and vertical incidence of the seismic waves.