Abstract
In order to figure out the values in dynamic states of bridge piers by the theory of vibrations, quite elaborate computations are required. If they are obtainable by adding a certain quantity to the static computed values the computations may become much simpler and easier. In this paper the author remarked an additional coefficient of vibrations D and studied it basing on practical data of the earthquake-proof computations of bridge piers. First, using an analog computer he obtained the transient solutions of a fundamental vibration of bridge piers under an assumed design earthquake motion: single cosine wave motion. He, then, applied some statistical considerations to the results above given an defined Dd which can be used in the practeial design of earthquake-proof constructions.
