Column Response to Horizontal-Vertical Earthquakes

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Abstract
Using a simple structural model which consists of a massless column supporting a concentrated mass at the top, it is shown that the vertical ground motion in an earthquake can amplify the power of the horizontal ground motion, and cause greater horizontal structural displacement response. Furthermore, this amplification effect is greater for greater initial response; i.e., the response initally computed without taking the vertical excitation into consideration. Although the present analysis is based on a linear structural model, numerical computations have included large deflections so that the general trend can become more visible, and the results so obtained can provide useful guides for future investigation into the nonlinear inelastic regimes.

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