Effect of Seismic Wave Inclination on Structural Response

by M. Tabatabaie, Harding Lawson Associates, San, Francisco, CA, USA,
N. Abrahamson, Harding Lawson Associates, San, Francisco, CA, USA,
J. P. Singh, Harding Lawson Associates, San, Francisco, CA, USA,

Document Type: Proceeding Paper

Part of: Dynamic Response of Structures


A new procedure is developed using the computer program SASSI to evaluate the effects of inclined propagating shear waves on three-dimensional seismic soil-structure interaction (SSI) response. An example of an offshore gravity structure is used to illustrate the procedure. Using the recorded motions from the two-dimensional dense strong motion array in Taiwan (SMART-1), the angle of incidence of incoming shear waves is estimated at 20 degrees. SSI analyses are performed for the same input motion using vertical as well as inclined wave propagation. The results show an increase of up to 50 percent in the horizontal response of the structure using the inclined wave assumption as opposed to the vertically propagating wave assumption.

Subject Headings: Seismic waves | Seismic tests | Structural response | Dynamic structural analysis | Shear waves | Ground motion | Offshore structures | Wave propagation | Taiwan | Asia

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