Tests of large bridge columns. . .0014 1 274 1001 486 450 +.0025 +.0028 +.0027 + .0024 1 698 800 1 911 150 + .0042 +.0048 +. 0043 + .0032 Load,pounds Load inpounds persquare inch 21 22 23 24 42 470212 350 1000 5000 10 000 15 000 20 000 25 00030 00035 00040 00045 000 0 0 0 0—.0014 424 700637 050 +.0008 +.0009 —.0026—.0048 849 4001 061 750 +.0016 +.0022 —.0084 1 274 1001 486 450 +.0026 +.0032 —.0104—.0123 1 698 800 —.0147 1 911 150 +.0044 +.0056 a Maximum load. b Fell off to i ooo ooo p
Tests of large bridge columns. . .0014 1 274 1001 486 450 +.0025 +.0028 +.0027 + .0024 1 698 800 1 911 150 + .0042 +.0048 +. 0043 + .0032 Load,pounds Load inpounds persquare inch 21 22 23 24 42 470212 350 1000 5000 10 000 15 000 20 000 25 00030 00035 00040 00045 000 0 0 0 0—.0014 424 700637 050 +.0008 +.0009 —.0026—.0048 849 4001 061 750 +.0016 +.0022 —.0084 1 274 1001 486 450 +.0026 +.0032 —.0104—.0123 1 698 800 —.0147 1 911 150 +.0044 +.0056 a Maximum load. b Fell off to i ooo ooo pounds. Wrinkles in web and angles west face above pin plates. Same on eastface to less extent. Note.—Stations i, 2, 3, and 4 give compressions in inches in gauge lengths of 80 inches. Other stationsgive (±) elongations in inches in gauge length of 8 inches. Tests of Large Bridge Columns 55 .rtl • // • / *3 • /Z • I Sec Tion to JFcfsf Face tt • ZO 23 9 ZZ • FT West k8 n yC»- Ute*/- Face North. ! X > ! I, fe-ll mi i X1 ? tf ! L • I i I 1 in North Face FlG. 17.—Column US2MSl (Mayari steel). Key to stations on Table 17 56 Technologic Papers of the Bureau of Standards TABLE 18.—Log of Test, Column U^, Carbon Steel [Area= Cumulative (±) Elongations at Stations Below. Tested Jan. 28, Load,pounds Load inpounds persquare inch 1 2 3 4 5 6« 7 8 9 10 96 010480 050 1000 5000 10 000 15 000 17 500 20 00022 50025 00027 500 30 000 31 000 0 —. 0 —.—. 0 —.—.1059 0 —.0608—. 0 0 0 0 0 0 960 1001 440 150 + .0023 1 680 200 1 920 200 2 160 200 -. 0016 2 400 250 2 640 300 2 880 300&2 980 000 Load,pounds Load inpounds persquare in
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