. A detailed study of bridge specifications . greater spacing than 1 11_16 -inches, and, for convenience, it is made three diameters of a rivet. The naxiinura allowable distance is determined hjr consider- Ing the material betTreen two rivets as acting under compression. low, to keep this little column A, from failing, the factor i should not he too great. Assume a limit for — ~. Theil. taking the radius of gyra- Ir 1 tion of a 5/8 inch plate, (the thinnestallowahle), ahout its x-x axis, in Figure. It is found tohe .108 inches. Therefore, the al-. lowable length of column is foun
. A detailed study of bridge specifications . greater spacing than 1 11_16 -inches, and, for convenience, it is made three diameters of a rivet. The naxiinura allowable distance is determined hjr consider- Ing the material betTreen two rivets as acting under compression. low, to keep this little column A, from failing, the factor i should not he too great. Assume a limit for — ~. Theil. taking the radius of gyra- Ir 1 tion of a 5/8 inch plate, (the thinnestallowahle), ahout its x-x axis, in Figure. It is found tohe .108 inches. Therefore, the al-. lowable length of column is found thus: 1 = 80r 1 = .108 X 80= inches. This would allow inches as the maximum distance between rivets, although — was taken small and the miniature columns taken asr hinged instead of fixed, as they really are. It would, therefore,seem perfectly consistent v/ith good design to allow the maximumspacing to be 20 times the thickness of the thinnest plate. Thiswould give an allowance, in the illustrative example above, of percent, 7-1/E inches. This woiild still be 15^on the side of safety, even though largest allowable — were only 80, « 56.*The distance betweon the edgeof any piece the centre of arivet-hole must never be less than1-1/4 inches, except for bp^rs lessthen 2-1/2 Inches wide; v;hen practi-cable it shall be at least tv;o diam-eters of the rivet. The principle object in specifying that the miniimira distance be 1-1/4 inches is to obviate an3/ tendency to lessen the efficiency of a rivet by placing it near the edge of the mater
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