. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. ould be placed on the verticalline through the center of the tables. Their lever arm is thusequal to one-half the table length, in this case in. The ten- 45,000 sion on the bolts = 1L5 = 3920 lbs. Two bolts will be used having an area of sq. in., for the stress on wrought iron boltsshould not exceed 10,000 lbs. per sq. in. The nearest size is foundto be f in. bolts, which have an area at the root of the threads= sq. in. and the combined area of two f
. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. ould be placed on the verticalline through the center of the tables. Their lever arm is thusequal to one-half the table length, in this case in. The ten- 45,000 sion on the bolts = 1L5 = 3920 lbs. Two bolts will be used having an area of sq. in., for the stress on wrought iron boltsshould not exceed 10,000 lbs. per sq. in. The nearest size is foundto be f in. bolts, which have an area at the root of the threads= sq. in. and the combined area of two f-in. bolts = in. Two f-in. bolts therefore will be used in the middle ofeach table and four more will be used as shown to bind the jointtogether. In Fig. 94 is shown a steel-tabled fish-plate joint. This is ajoint that requires especially good and careful inspection. It is adetail for members carrying heavy stresses. It costs considerablefor materials and on account of the number of tables requiredthe labor cost is high, for there must be very careful cutting to _/ , insure even and dM-s-^^^e^ 9-^3^-/04-4>i2h-. snug bearing for allthe tables. Bearing area re-quired for tables =45,000 2, 4>^8P/afes S-Oi 8,1 % Tables,bearing % 12, ^/s Bolts. b\dQ Elevation. 12,00 Totaldepth = tables == in. 2x8 (make it 2| in.). Fig. 94—Steel Tabled Fish-plate Joint Will use tables ly\ in. = 8 in., requiring 8 tables in all. Each table transmits i5^ = 11,250 lbs. and requires three 4 |-in. rivets, as determined by bearing on a A-in. plate (see page JOINTS AND CONNECTIONS 159 190). The tables are solid pieces of steel bar lj\ ins. thick by 3 riveted to the i\-in. plate used as a fish-plate. The thicknessof the fish-plate is determined as follows: Net section of one plate required = = sq. ins. Z X iUjUUU Net section of j\ by 8-in. steel plate (deducting the three rivet holes for the table rivets) = y^ X (8 - (3 X
Size: 2701px × 925px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidpracticalstr, bookyear1921
