Abstract
This paper is written regarding the fact that the present writer loaded concentrically by use of an Amaler type compression tester on the centre of nine models (span length, about 1≒80cm)-five through Warren truss models (the panel points welded, riveted, bolted and pinned), two deck Warren truss models (the panelpoints welded and pinned) and two deck Pratt truss models (the panel points welded and pinned). It is also concerned with the fact that he measured by use of strain-meters and dialgauges stress and deflection within the limits of buckling or elastic failure of the models and explained the influences of the deformation of the truss and rigidity of its panel points by comparing with the theoretical values. At the same time, he observed and cleared up the phenomenon of elastic failure or buckling by gradually creasing a concentrated load into a breaking one, and from the results of the comparative study of the theoretical and experimental values he pointed out that the assumption of the old calculating theory is not suitable in a certain case and closely investigated the right assumption in the calculating theory of the truss. With scrupulous care he made a comparative study of the experimental and theoretical values concerning the influence of the secondary stress intensity and such like.
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