. The street railway review . ndianapolisNorthern Traction Lines. During the summer of 1903 thirty-three concrete-steel archeswere erected on the Indianapolis Northern Division of the IndianaUnion Traction System, by the Natipnal Bridge Co., of arches were of spans varying from 4 ft. to 32 ft. and were re-inforced with steel rods according to the Luten system of archconstruction, as shown in the accompanying sections. This typeof reinforcement is based on the principle that in any combmationof steel and concrete the steel should be so placed as to resisttension, while the conc
. The street railway review . ndianapolisNorthern Traction Lines. During the summer of 1903 thirty-three concrete-steel archeswere erected on the Indianapolis Northern Division of the IndianaUnion Traction System, by the Natipnal Bridge Co., of arches were of spans varying from 4 ft. to 32 ft. and were re-inforced with steel rods according to the Luten system of archconstruction, as shown in the accompanying sections. This typeof reinforcement is based on the principle that in any combmationof steel and concrete the steel should be so placed as to resisttension, while the concrete is relied upon to resist compressive I in in diameter, and spaced at intervals of from 12 in. to 18 rods were used in preference to deformed steel for severalreasons; because there is as yet no good reason for supposing thatsmooth steel properly embedded will slip even under vibratoryloads; because the cost of smooth steel rods was 40 per cent lessthan corrugated bars; because of the greater ease of securing the.
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