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■建築研究報告 |
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A Model Test on Behaviors of Structure Subjected to Differential Settlements Yorihiko OHSAKI 建築研究報告 No.23, 1957 建設省建築研究所 |
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＜概要＞ |
| In computing the settlement of a structure
located upon a soft, compressible soil deposit, it is a common practice
to assume that the superstructure is perfectly flexible; in other words,
structural load at each individual portion of the structure acts upon
the subsoil independently and definite in magnitude whatever differential
settlements may be developed.
However, most structures have more or less rigidity and, owing to the action thereof, the load at a portion of larger settlement is relieved and transmitted to other less settled portions through the superstructure; thus, the amount of differential settlements tends to become smaller. One cause of the discrepancy between observed and computed settlements of the structure may be found in this fact as discussed in the writer's previous paper1). Attempts to take the effect of structural rigidity into settlement computations have been made by several persons; Y.Yokoo and K.Yamagata2), Kyoto University, and the writer3) published papers dealing with the same problem of this nature in somewhat different ways, and S. Chamecki4) presented a paper recently, in which more practical method of settlement computations was shown. In the above paper, the writer discussed the interaction of the superstructure and the subsoil analytically; and it is intended in this paper to confirm the validity of the analytical theory by means of a model test. As a model of the superstructure, a continuous beam of steel was used, and it was laid over three supporting bases (footings) which, in turn, were placed upon the surface of artificially-made clayey subsoil. Then, the steel beam was loaded with steel bars to cause the settlements of the footings. Bending stresses in the beam, settlements of the footings and reactions at each of those footings were measured at appropriate time intervals. Finally, these measurement results are compared with corresponding values computed on the basis of the writer's theory. |
