. The Bell System technical journal . Fig. 1 — Thin-walled tube with SR-4 strain gages. STRENGTH REQUIREMENTS FOR ROUND CONDUIT 739. Fig. 2 — Test set. External loads acting upon the conduit produce circumferential bend-nig moments in the conduit wall. The magnitude and distribution ofthese bending moments have been determined in tests conducted recentlyat the Outside Plant Development Laboratory, Chester, New Jersey,and at Atlanta, Georgia. These tests were made with gravel, sand, andclay as backfill, in trenches of ^arious width and depth and under con-ditions simulating, as nearly as possib
. The Bell System technical journal . Fig. 1 — Thin-walled tube with SR-4 strain gages. STRENGTH REQUIREMENTS FOR ROUND CONDUIT 739. Fig. 2 — Test set. External loads acting upon the conduit produce circumferential bend-nig moments in the conduit wall. The magnitude and distribution ofthese bending moments have been determined in tests conducted recentlyat the Outside Plant Development Laboratory, Chester, New Jersey,and at Atlanta, Georgia. These tests were made with gravel, sand, andclay as backfill, in trenches of ^arious width and depth and under con-ditions simulating, as nearly as possible, those encountered in the field. TEST APPARATUS AND PROCEDURE A test method was developed which permitted the determination ofthe circumferential bending moments in thin-walled conduits underfield conditions. The test device consisted of thin-walled aluminum or steel tubes ofone foot length. The steel tubes used had an outside diameter of 4 inchesand a wall thickness of inches; the aluminum tubes had an out-side diameter of inches and a wall thickness of inches. SR-4strain gages were attached to the inside
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
