Test of a highway bridge . while the weightof the fifteen-ton engine, and of the eight-ton roller was considered as distribut-over four Joists. Whether or not this is the true distribution of the load can bedetermined only by experiment. The deflection of the bridge under the weight of thelumber wagon, and of the eight-ton roller was determined theoretically by the meth-od given in Part II of Llerriman and Jacobys text book on Roofs and Bridges. In\ each case the load was placed in a position to oause the maximum shear in thej middle panel of the bridge. The dead load stresses are given in eac
Test of a highway bridge . while the weightof the fifteen-ton engine, and of the eight-ton roller was considered as distribut-over four Joists. Whether or not this is the true distribution of the load can bedetermined only by experiment. The deflection of the bridge under the weight of thelumber wagon, and of the eight-ton roller was determined theoretically by the meth-od given in Part II of Llerriman and Jacobys text book on Roofs and Bridges. In\ each case the load was placed in a position to oause the maximum shear in thej middle panel of the bridge. The dead load stresses are given in each of the following tables. Table I i i shows the stresses due to the fifteen-ton engine of Waddells Specifications. Thej dimensions of this engine are shown in Fig. 1. The impact stress is computed fromj each of the three formulae given in the introduction, and the maximum impact stress is combined with the dead load stress and the static live load stress to produce the maximum stress given in the last column of the s -* 1 riyl. Wadctc/ti /J-TonEnqine. The maximum shear in each panel is produced when the rear wheel of the engine isat the panel point, with the front wheel in the panel, and the maximum stressesare computed from these shears. 8. The wagon used in the tests i& shown in Fig. 2 . Lumber was used forloading the wagon. The stresses due: to the weight and impact of this wagon aregiven in Tables II, III, and IV, each of these tables showing impact stresses ascomputed from one of the three formulae given in the introduction. The maximumtestofhighwaybri00kaar
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