Tests of large bridge columns. . 0 1 146 900 1 529 200 2 293 8002 676 100 1000 5000 10 000 15 000 20 000 30 00035 00040 00045 000 0 + .0003+ .0004+ .0007+.0011 + .0017 0 + .0001+ .0004+ .0006+.0010 +.0018 0 + .0004+ .0008+ .0012+.0018 +.0030 0 +.0002 +.6665+.0008 0 0 —. —. 0 0 — .0077 3 058 4003 440 700 +.0022 + .0028 + .0048 + .0008 — .0103 a The initial reading may have been in error. The observer complained of ba
Tests of large bridge columns. . 0 1 146 900 1 529 200 2 293 8002 676 100 1000 5000 10 000 15 000 20 000 30 00035 00040 00045 000 0 + .0003+ .0004+ .0007+.0011 + .0017 0 + .0001+ .0004+ .0006+.0010 +.0018 0 + .0004+ .0008+ .0012+.0018 +.0030 0 +.0002 +.6665+.0008 0 0 —. —. 0 0 — .0077 3 058 4003 440 700 +.0022 + .0028 + .0048 + .0008 — .0103 a The initial reading may have been in error. The observer complained of bad holes for gauge points. b Primary failure. Buckling to west 2 inches. cMaximum load. d Load fell to 2 520 000. Total deflection to west, 7H inches; to north, ilA inches. Note.—Stations 1, 3, 4, and 6 give compressions in inches in gauge lengths of 80 inches. Other stationsgive (±) elongations in inches in gauge lengths of 8 inches. Tests of Large Bridge Columns 43 \ : r 1 2 8 t t*i ^ 1 1 V 1 <o i J _ j ir tt Tr^m. East Face IVesf Face Sot/ft Face Aforft, Face Fig. 12.—Column MY I (Mayari steel). Key to stations on Table 12 44 Technologic Papers of the Bureau of Standards TABLE 13.—Log of Test, Column 31HC1, Carbon Steel [Cumulative (±) Elongation at Stations Below. Tested July 10, 1914. Time of test, a. m. to 12 m.] Load in Load in Load,pounds pounds persquare 1 2 3 4 Load,pounds poundsper square 1 2 3 4 inch 1 inch 76 260 1000 0 0 0 0 0 0 0 0 381 300 5000 2 440 320 32 00( —.0927 -. 1003 762 600 10 000 —.0211 — .0212 a 2 592 84C 34 00C -. 1040 —.1027 991 380 13 000 —.0293 2 745 360 36 000 -. 1247 —.1250 1 067 640 14 000 2 897 880 38 000 -. 1330 —.1446 -. 1447 1 143 900 15 000 3 050 400 40 000 -. 1632 -. 1599 1 220 160 16 000 3 202
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