Foundations for Bridges And Buildings
Foundations for Bridges And Buildings
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0 in.
3 5 6 7-4 I 5 // ~55 Ib. 68. 1 5 . 75 in. 1. 8 in.
The choice lies between Nos. I and 2, since No. 3 does not give sufficient clearance. The weight favors No. I, being 250 pounds lighter, while No. 2 gives a more satisfactory clearance and has less depth, thus saving on concrete filling and also on excavation work.
Cost of 250 Ibs. Of steel at 2\ cents $6. 25 Cost of a 2-in. Thickness of concrete $i . 65 Amount saved by using design No. I $4 . 60 For the lower tier: Max. M = (600 000/4) (...5 1. 5)12 = 6 300 ooo Ib. - in. Total required I/e = 6 300 000/16 000=394 in 3 . The following results are obtained by trying various combinations of beams: 464 SPREAD FOUNDATIONS CHAP. XV No.
i 2 3 4 Number of beams 10 12 14 16 lie re- quired 39-4 32. 9 28. 2 24. 6 Size of beam i2"-4o Ib. I2"- 3 ii Ib.
I/e fur- nished 41 . O 36. 0 36. 0 24. 4 Width of flange 5. 21 in. 5 . Oo in. 5 . Oc in. 4. 66 in.
Clear- ance 7 . 5 in. 5 5 in. 3. 8 in. 3. 0 in.
io"-25 Ib.
The choice lies between Nos. 2 and 4; the latter has 220 pounds more steel but the clearance is better and a 2-inch depth of concrete is saved Cost of 220 Ibs.
What to read after Foundations for Bridges And Buildings?
You can find similar books in the "Read Also" column, or choose other free books by Roland P Roland Parker Davis to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
0 in.
3 5 6 7-4 I 5 // ~55 Ib. 68. 1 5 . 75 in. 1. 8 in.
The choice lies between Nos. I and 2, since No. 3 does not give sufficient clearance. The weight favors No. I, being 250 pounds lighter, while No. 2 gives a more satisfactory clearance and has less depth, thus saving on concrete filling and also on excavation work.
Cost of 250 Ibs. Of steel at 2\ cents $6. 25 Cost of a 2-in. Thickness of concrete $i . 65 Amount saved by using design No. I $4 . 60 For the lower tier: Max. M = (600 000/4) (...5 1. 5)12 = 6 300 ooo Ib. - in. Total required I/e = 6 300 000/16 000=394 in 3 . The following results are obtained by trying various combinations of beams: 464 SPREAD FOUNDATIONS CHAP. XV No.
i 2 3 4 Number of beams 10 12 14 16 lie re- quired 39-4 32. 9 28. 2 24. 6 Size of beam i2"-4o Ib. I2"- 3 ii Ib.
I/e fur- nished 41 . O 36. 0 36. 0 24. 4 Width of flange 5. 21 in. 5 . Oo in. 5 . Oc in. 4. 66 in.
Clear- ance 7 . 5 in. 5 5 in. 3. 8 in. 3. 0 in.
io"-25 Ib.
The choice lies between Nos. 2 and 4; the latter has 220 pounds more steel but the clearance is better and a 2-inch depth of concrete is saved Cost of 220 Ibs.
What to read after Foundations for Bridges And Buildings?
You can find similar books in the "Read Also" column, or choose other free books by Roland P Roland Parker Davis to read onlineMoreLess
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