Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/~phil/hardware/telescope/Main_Truss_Capacity.pdf Дата изменения: Sat May 22 00:43:53 2010 Дата индексирования: Sat Jun 26 00:44:56 2010 Кодировка: Поисковые слова: п п п п п п п п п п п п п п

ARECIBO RADIO OBSERVATORY FEED PLATFORM MEMBER CAPACITY AND LOAD TABLE - MAIN TRUSS

MAIN TRUSS Worst Case Azimuth Member Italic Members Fy = 36 ksi Original Member 1992 Reinforcement

(-) Compression (+) Tension
30 kip Tie Downs 0 kip Tie Downs

Bottom Chord Flanges:

Fy = Fu =

46 67

ksi ksi

U = 0.85 U = 0.899

U.O.N. U3-L4

Other:

Fy = Fu =

50 70

ksi ksi

k= 4.71(E/Fy)

1.00 113.43

Area
[in2]

Area
[in2]

1963 Force Table
[kip]

1992 Operational
[kip]

1992 Survival
[kip]

2010 STAAD Forces (70° F)
[kip]

2010 STAAD Forces (90° F)
[kip]

2010 STAAD Min. Forces Length Gross Area
[kip] [ft] [in2]

Tension Limited Members 0.6FyAg
[kip]

Compression Limited Members I
[in4]

Anet
[in2]

0.5FuAe
[kip]

1963 Ratio 1992 Ratio 1992 Ratio 2010 Ratio 2010 Ratio
Operational Operational Survival (70° F) (90° F)

r
[in]

kL/r

Fcr
[ksi]

Pn/
[kip]

1963 Ratio 1992 Ratio 1992 Ratio 2010 Ratio 2010 Ratio
Operational Operational Survival (70° F) (90° F)

Top Chords 120 Uo-U1 4-L3.5x3.5x5/16 315 U1-U2 2-C18x42.7 315 U2-U3 2-C18x51.9 315 U3-U4 2-C18x58 315 U4-U5 2-C18x58 Bottom Chords 150 Lo-L1 2-18x1 1/16 + 21 7/8x1/2 150 L1-L2 2-18x1 1/16 + 21 7/8x1/2 315 L2-L23 2-18x1 1/4 + 21 1/2x1/2 315 L23-L3 2-18x1 1/4 + 21 1/2x1/2 315 L3-L4 2-18x1 7/16 + 21 1/8x1/2 315 L4-L5 2-18x1 1/2 + 21x9/16 Verticals 120 Uo-Lo 4-L5x5x3/8 315 U1-L1 2-L5x3x5/16 315 U2-L2 2-C12x25 315 U2L3-L23 315 U3-L3 2-C12x25 150 U4-L4 2-C12x25 315 U5-L5 2-L6x3.5x5/16 Diagonals 315 U1-Lo 2-C15x33.9 315 U1-L2 2-C8x18.75 315 U2-U2L3 2-C8x18.75 315 U2L3-L2 315 U2L3-L3 2-C8x18.75 315 U3-L4 2-C10x20 150/135 U4-L5 2-C12x25

8.36 25.2 30.6 34.2 34.2 49.1875 49.1875 55.75 55.75 62.3125 65.8125 14.44 4.8 14.68 14.68 14.68 5.74 20 11.02 11.02 11.02 11.74 14.68

4-L3.5x3x3/8 4-L3.5x3x3/8

9.2 9.2

20 -376 -557 -663 -654 1362 1362 1553 1553 1736 1825

-104 -395 -592 -778 -770 1301 1301 1430 1430 1689 1510 -302 0 -252 -104 85/-307 -108 0 -232 285 316 410 312/-23 115/-102

-30 -401 -611 -735 -722 1274 1274 1469 1469 1645 1548 -96 0 -267 -105 -282 151/-173 0 -323 302 332 381 297/-36 138/-125

-66 -434 -666 -830 -783 1352 1354 1520 1013 1235 1377 -206 6 -298 -90 -344 108/-140 -12 -349 324 371 54 448 307 159/-132

-50 -450 -698 -854 -810 1351 1353 1530 968 1212 1359 -161 5 -318 -89 -353 105/-138 -12 -365 347 397 56 459 299 155/-126

24 48 48 72 72 24 24 24 24 24 24 30 30 28 12 30 30 30 34.4 38.4 17.2 17.2 17.2 38.4 38.4

8.36 25.2 30.6 43.4 43.4 49.1875 49.1875 55.75 55.75 62.3125 65.8125 19 4.8 14.68 8.08 21.8 14.68 5.74 20 11.02 11.02 6.74 22.04 11.74 14.68 1357.58 1357.58 1538.70 1538.70 1719.83 1816.43 52.19 44.49 1486.04 1490.42 100.33% 100.33% 100.93% 100.93% 100.94% 100.47% 95.83% 95.83% 92.94% 92.94% 98.21% 83.13% 93.84% 93.84% 95.47% 95.47% 95.65% 85.22% 99.59% 99.74% 98.78% 65.83% 71.81% 75.81% 99.52% 99.66% 99.43% 62.91% 70.47% 74.82%

1011 3146.5 3831.6 5793 5793

11 11.17 11.19 11.55 11.55

26.18 51.57 51.47 74.81 74.81

47.56 41.17 41.19 33.21 33.21

238.06 621.18 754.81 863.08 863.08

60.53% 73.79% 76.82% 75.78%

43.69% 63.59% 78.43% 90.14% 89.22%

12.60% 64.55% 80.95% 85.16% 83.65%

27.72% 69.87% 88.23% 96.17% 90.72%

72.44% 92.47% 98.95% 93.85%

56.94

1907.41

4-L5x5x1/2

19

-44 0 -238 -221 -103 -8 -319 305 291

2204 103.68 0.00% 5.79% 288 72.2 438.7 288

10.77 4.43 2.99 4.48 4.43

33.43 75.85 48.16 80.36 81.26

46.08 32.83 42.20 31.18 30.85

524.24 288.61 204.18 407.06 271.19

8.39% 82.47% 54.29% 37.98%

57.61% 87.32% 50.94% 75.42% 39.82%

18.31% 92.51% 51.43% 69.28% 63.79%

39.30% 103.25% 44.08% 84.51% 51.62%

30.71% 110.18% 43.59% 86.72% 50.89%

-49

2-C8x13.75 4-L3.5x2.5x5/16

8.08 7.12

654.00 440.40

13.00% 34.29% 24.30% 23.84%

-55 32 51

630 330.60 330.60 202.20 661.20 352.20 440.40 15.04 9.14 17.90 10.13 447.56 319.90 532.53 318.71 92.26% 90.97% 54.65% 61.50% 24.07% 86.21% 98.78% 76.99% 97.89% 26.11% 91.35% 103.78% 71.55% 93.19% 31.34% 98.00% 115.97% 26.71% 84.13% 96.33% 35.88% 104.96% 124.10% 27.70% 86.19% 93.82% 35.20%

5.62

73.45

33.70

403.61

79.04%

57.48%

80.03%

86.47%

90.43%

2-C8x11.5 2-C8x18.75

6.74 11.02

291 196 106/-100

16

288

4.43

104.02

22.67

199.25

50.19%

51.19%

62.73%

64.24%

63.24%

* Based on 30 kip tie down forces at each corner to start with 19,600 foot-kip unbalanced moment. Azimuths investigated: 120°, 135°, 150°, 300°, 315°, 330°. 90%-100% Stressed Over 100% Stressed

K:\PROJ\A&W\4176\CALCS\2010 Analysis Models (VMA)\Results\100518 Updated Truss Results

05/21/2010