Tests of large bridge columns. . the ordinates of a parabolafrom zero to a maximum just over the pin would be more inaccord with mechanical methods, for a first approximation to thestress constituents on the surface boundary at pin. In the caseof column U^M! (Mayari) a study of the compressions at stations35> 36, 37, and 38, Table 19, show that the maximum intensity of 44 See Chapters VIII and IX, Loves Theory of Elasticity, 2d ed. Also Comptes Rendus, Tome 114,1892, p. 1467, Sur la repartition des pressionsdansun solide rectangulaire charge transversalement, byFlamant. 45 Discussed by Sir
Tests of large bridge columns. . the ordinates of a parabolafrom zero to a maximum just over the pin would be more inaccord with mechanical methods, for a first approximation to thestress constituents on the surface boundary at pin. In the caseof column U^M! (Mayari) a study of the compressions at stations35> 36, 37, and 38, Table 19, show that the maximum intensity of 44 See Chapters VIII and IX, Loves Theory of Elasticity, 2d ed. Also Comptes Rendus, Tome 114,1892, p. 1467, Sur la repartition des pressionsdansun solide rectangulaire charge transversalement, byFlamant. 45 Discussed by Sir G. G. Stokes in paper by Wilson, Proceedings Physical Society of London, Vol. XI,1891, p. 194, The Influence of Surface Loading on the Flexure of Beams. Also by Love, Theory of Elas-ticity, 2ded., p. 351. Tests of Large Bridge Columns 131 stress is on the axis just over the pin 4e and that there is a ratherpronounced decrease at 35 to 38 from 36 to 37 and more so asone goes from the axis laterally. In the case of column HC (car-. FiG. 71.—Field of strain at pin {conceptual) bon), see Table 6, the distribution over the pin is more uniform,but the influence of the longitudinal diaphragm is thought to bepresent here to modify the action described. Now as rivets aredesigned for bearing and shear with respect to their uniform dis- 46 This is a common physical phenomenon; for example, when a positive electrode is placed convenientlynear an equally strong negative electrode, these constituting a source and sink, the main flow is inthe straight line between them, but a portion will spread out over the intervening medium in the abovemariner. In the present case, carrying out the analogy, the column may be considered grounded at theupper end, the strain energy being transmitted from the pin through the member. 132 Technologic Papers of the Bureau of Standards tribution on plates, it will be rather obvious, in common practice,that there is a tendency for rivets to be overstressed just o
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