The Structural Engineer > Archive > Volume 10 (1932) > Issues > Issue 7 > Effects of Earthquakes on Structures
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Effects of Earthquakes on Structures

IT is first desirable to explain how designers in the past have estimated the forces to be resisted. The few reliable determinations available have forced the designer into two courses, one based upon a horizontal force bearing some arbitrary proportion to g, while the other rests upon a wind pressure acting upon any face of the building under consideration. Following the San Francisco earthquake of 1906, much support was given to the latter method; but it is now held to be untenable on the grounds that the lateral force on a building weighing 1,000 tons would be the same as on one weighing 10,000 tons were the exposed dimensions the same in both cases. This is obviously absurd, as the force of any moving body is proportional to its mass. A.S. Mitchell