Test of a highway bridge . u. or I. *. m. FOAM 3. u- or i. e. a. ro«M » 22. COMPARISONS. 0 The aotual stresses in the various members of the bridge do not agree atall with the theoretical stresses. This fact is probably due to the unusually rigidfloor system. The reinforced concrete floor tends to distribute the load in suoh away that the actual stress in any member is quite small. The impact stresses do not follow a fixed rule, but rather the percentageof impact seems to be greatest in the smallest members. During the tests with theeight-ton roller the greatest impact stress was recorded
Test of a highway bridge . u. or I. *. m. FOAM 3. u- or i. e. a. ro«M » 22. COMPARISONS. 0 The aotual stresses in the various members of the bridge do not agree atall with the theoretical stresses. This fact is probably due to the unusually rigidfloor system. The reinforced concrete floor tends to distribute the load in suoh away that the actual stress in any member is quite small. The impact stresses do not follow a fixed rule, but rather the percentageof impact seems to be greatest in the smallest members. During the tests with theeight-ton roller the greatest impact stress was recorded when the roller first en-tered the bridge, or when it struck an uneven place in the floor cushion, causinga sidewise rocking motion of the roller. This condition is similar to uneven railjoints on a railway bridge, which is known to be an important factor in the deter-mination of impaot due to the passage of trains. In a few cases the impact was abouthalf the static stress, and in some cases the static stress and the impact stresswere equal. I
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