In the present paper, the writer deals with various aspects of a uniform beam simply supported at both ends when a single load rolls over it at different speeds. With special reference to Zimmermann's effect, he has made experimental studies upon the reactions at both ends, (shearing force), the maximum bending moment, the deflection at the middle point, and the path of the load as compared with those in a statical state. As a result of these experiments, an empirical formula has been deduced, in which the deflection at the middle point of the beam under the rolling load is a function of the span of beam, the weight of load, and the velocity of rolling load. The formula will give us a basis from which various behaviors of beams in dynamical state are to be estimated.
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