Author(s)

O.G. de Pineres

Abstract

In solving the fundamental equation of forced motion in Dynamics, one must often make arbitrary assumptions and interpretations to arrive at practical solutions of the equation of motion. Consequently, one may arrive at conflicting results. A typical example is the dynamic solution of structures for external forces as opposed to similar solution for internal mass-inertia forces from earthquakes. External forces can be from wind and explosion. As shown in this paper, seismic codes are solving these two problems similarly, thus erroneously. They must use different forms and different physical units of the equation of motion. In showing this, the author also proves mathematically that the basic seismic Equation 28.1 of the 1994 Uniform Building Code (UBC) is not safe for the design and construction of buildings and structures. He previously made this claim to the International Conference of Building Officials (ICBO) at a Public Hearing

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