Wayne Moore's Communities Activities

3D Modeling Issue with Hat Channel members (Purlins) failing due to being an open section.

Wayne Moore — Mon, 14 Mar 2022 12:38:12 GMT

As noted in the subject title, I'm having issues with getting the hat channel members (purlins) to pass in my 3D model. The members pass if I do a bending check by hand using the same gravity load and section modulus shown in the model (Sy=Iy/c). As you can see I assigned one of the purlins to be a 1"x1-14ga tube steel member to check and see if it would pass. I picked this section due to it having similar section properties as the hat channel except it is a closed shape. Any advice on how to analyze the hat channels in STAAD so that they are only seeing axial bending from the gravity/uplift loading would be greatly appreciated. Also, please address any other errors you may notice in my model.

P.S. I did reference Section F.1 of the Steel Manual to check and see the failure mode that the hat channel was under, but I didn't get much context from the section. Also, the actual building will be 100' long and have 26 frames, I attached only a 3 frame section for simplicity. Thank you!

communities.bentley.com/.../100x-_2800_1.5_2700_-_2600_-3_2700_-Chord-Spacing_2900_-Frame.STD

80x Truss Model on Pin & Roller Supports

Wayne Moore — Wed, 15 Sep 2021 14:48:28 GMT

STAAD TRUSS DXF Import of 80x (1.5' & 3' Chord Spacing- 39'-3in Tie System).dxf
START JOB INFORMATION
ENGINEER DATE 25-Aug-21
END JOB INFORMATION
INPUT WIDTH 79
UNIT INCHES KIP
JOINT COORDINATES
1 105.253 -83.3731 0; 2 105.253 -73.323 0; 3 585.253 36.6269 0;
4 585.253 46.677 0; 5 122.715 -79.0074 0; 6 140.178 -74.6418 0;
7 175.103 -65.9105 0; 8 210.028 -57.1792 0; 9 244.953 -48.4479 0;
10 279.878 -39.7167 0; 11 314.803 -30.9854 0; 12 349.728 -22.2541 0;
13 384.654 -13.5228 0; 14 419.579 -4.79153 0; 15 454.504 3.93975 0;
16 489.429 12.671 0; 17 524.354 21.4023 0; 18 559.279 30.1336 0;
19 1047.79 -79.0074 0; 20 1030.33 -74.6418 0; 21 995.402 -65.9105 0;
22 960.477 -57.1792 0; 23 925.552 -48.4479 0; 24 890.627 -39.7167 0;
25 855.702 -30.9854 0; 26 820.777 -22.2541 0; 27 785.852 -13.5228 0;
28 750.926 -4.79153 0; 29 716.001 3.93975 0; 30 681.076 12.671 0;
31 646.151 21.4023 0; 32 611.226 30.1336 0; 33 120.35 -69.5485 0;
34 137.813 -65.1829 0; 35 172.738 -56.4516 0; 36 207.663 -47.7203 0;
37 242.588 -38.9891 0; 38 277.514 -30.2578 0; 39 312.439 -21.5265 0;
40 347.364 -12.7952 0; 41 382.289 -4.06392 0; 42 417.214 4.66736 0;
43 452.139 13.3986 0; 44 487.064 22.1299 0; 45 521.989 30.8612 0;
46 556.915 39.5925 0; 47 1050.15 -69.5485 0; 48 1032.69 -65.1829 0;
49 997.767 -56.4516 0; 50 962.842 -47.7203 0; 51 927.917 -38.9891 0;
52 892.992 -30.2578 0; 53 858.067 -21.5265 0; 54 823.141 -12.7952 0;
55 788.216 -4.06392 0; 56 753.291 4.66736 0; 57 718.366 13.3986 0;
58 683.441 22.1299 0; 59 648.516 30.8612 0; 60 613.591 39.5925 0;
61 1065.25 -83.3731 0; 62 1065.25 -73.323 0; 63 454.504 -22.2541 0;
64 585.253 -22.2541 0; 65 716.001 -22.2541 0;
MEMBER INCIDENCES
1 1 2; 2 3 4; 3 5 6; 4 6 7; 5 7 8; 6 8 9; 7 9 10; 8 10 11; 9 11 12;
10 12 13; 11 13 14; 12 14 15; 13 15 16; 14 16 17; 15 17 18; 16 18 3;
17 19 20; 18 20 21; 19 21 22; 20 22 23; 21 23 24; 22 24 25; 23 25 26;
24 26 27; 25 27 28; 26 28 29; 27 29 30; 28 30 31; 29 31 32; 30 32 3;
31 33 34; 32 34 35; 33 35 36; 34 36 37; 35 37 38; 36 38 39; 37 39 40;
38 40 41; 39 41 42; 40 42 43; 41 43 44; 42 44 45; 43 45 46; 44 46 4;
45 47 48; 46 48 49; 47 49 50; 48 50 51; 49 51 52; 50 52 53; 51 53 54;
52 54 55; 53 55 56; 54 56 57; 55 57 58; 56 58 59; 57 59 60; 58 60 4;
59 61 62; 60 6 34; 61 7 35; 62 8 36; 63 9 37; 64 10 38; 65 11 39;
66 12 40; 67 13 41; 68 14 42; 69 15 43; 70 16 44; 71 17 45; 72 18 46;
73 20 48; 74 21 49; 75 22 50; 76 23 51; 77 24 52; 78 25 53; 79 26 54;
80 27 55; 81 28 56; 82 29 57; 83 30 58; 84 31 59; 85 32 60; 86 12 63;
87 3 64; 88 15 63; 89 29 65; 90 63 64; 91 64 65; 92 65 26; 93 15 64;
94 64 29; 95 5 33; 96 33 2; 97 5 1; 98 19 47; 99 47 62; 100 19 61;
START USER TABLE
TABLE 1
UNIT INCHES KIP
TUBE
2.25X2.25-14GA
0.681 2.25 2.25 0.0784 0.536 0.536 0.772 0.476 0.476
TABLE 2
UNIT INCHES KIP
TUBE
2-2.25X2.25-14GA
1.362 4.5 2.25 0.0784 2.796 1.072 1.544 1.243 0.953
TABLE 3
UNIT INCHES KIP
TUBE
2.25X2.25-12GA
0.94 2.25 2.25 0.1098 0.719 0.719 1.035 0.64 0.64
END
DEFINE MATERIAL START
ISOTROPIC STEEL
E 29000
POISSON 0.3
DENSITY 0.000283
ALPHA 6.5e-06
DAMP 0.03258
TYPE STEEL
STRENGTH FY 54 FU 54 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER PROPERTY AMERICAN
1 3 TO 86 88 89 92 TO 96 98 99 UPTABLE 1 2.25X2.25-14GA
2 87 UPTABLE 2 2-2.25X2.25-14GA
90 91 97 100 UPTABLE 3 2.25X2.25-12GA
UNIT FEET KIP
CONSTANTS
MATERIAL STEEL ALL
SUPPORTS
1 PINNED
61 FIXED BUT FX
LOAD 1 LOADTYPE None TITLE GRAV (D+S)
MEMBER LOAD
31 TO 58 96 99 UNI GY -0.126
SELFWEIGHT Y -1
LOAD 2 LOADTYPE None TITLE UPLIFT (0.6D+0.6W)
MEMBER LOAD
31 TO 58 96 99 UNI GY 0.031
PERFORM ANALYSIS PRINT ALL
PARAMETER 1
CODE AISC UNIFIED 2010
METHOD ASD
FYLD 7776 MEMB 1 2 3 TO 89 92 TO 96 98 99
FYLD 9288 MEMB 90 91 97 100
CHECK CODE ALL
PRINT ALL
FINISH

A decent amount of warning notes popped up when I analyzed this Truss model. We are having discussion in the office whether this is the correct way to model a Truss in STAAD and if the warnings in the output affect the accuracy of the results. Our alternative way to model the Truss is in plane frame with pin-pin supports. Any direction on which model is correct and how to limit the warnings in the model would be greatly appreciated.

Pole Barn Truss Design

Wayne Moore — Mon, 29 Mar 2021 19:41:49 GMT

STAAD PLANE DXF IMPORT OF PIPE TRUSS (4' O.C.SPACING - ADDED DIAGONALS).DXF
START JOB INFORMATION
ENGINEER DATE 29-Mar-21
ENGINEER NAME JS
END JOB INFORMATION
INPUT WIDTH 79
UNIT INCHES KIP
JOINT COORDINATES
1 488.067 138.816 0; 2 756.73 138.816 0; 3 22.3984 22.3987 0;
4 68.9653 34.0404 0; 5 115.532 45.6821 0; 6 162.099 57.3238 0;
7 208.666 68.9656 0; 8 255.233 80.6073 0; 9 301.799 92.249 0;
10 348.366 103.891 0; 11 394.933 115.532 0; 12 441.5 127.174 0;
14 534.634 150.458 0; 15 581.201 162.099 0; 16 22.3984 56.5432 0;
17 60.9313 66.1764 0; 18 573.167 194.235 0; 19 619.733 205.877 0;
20 526.6 182.593 0; 21 480.033 170.952 0; 22 433.466 159.31 0;
23 386.899 147.668 0; 24 340.332 136.027 0; 25 293.765 124.385 0;
26 247.199 112.743 0; 27 200.632 101.102 0; 28 154.065 89.4598 0;
29 107.498 77.8181 0; 30 622.398 206.543 0; 31 1222.4 22.3987 0;
32 1175.83 34.0404 0; 33 1222.4 56.5432 0; 34 1183.87 66.1764 0;
35 1129.26 45.6821 0; 36 1137.3 77.8181 0; 37 1082.7 57.3238 0;
38 1090.73 89.4598 0; 39 1036.13 68.9656 0; 40 1044.17 101.102 0;
41 989.564 80.6073 0; 42 997.598 112.743 0; 43 942.997 92.249 0;
44 951.031 124.385 0; 45 896.431 103.891 0; 46 904.465 136.027 0;
47 849.864 115.532 0; 48 857.898 147.668 0; 49 803.297 127.174 0;
50 811.331 159.31 0; 51 764.764 170.952 0; 53 718.197 182.593 0;
54 710.163 150.458 0; 55 671.63 194.235 0; 56 663.596 162.099 0;
57 625.063 205.877 0; 58 619.733 171.732 0; 59 625.063 171.732 0;
60 622.398 172.399 0;
MEMBER INCIDENCES
1 1 2; 2 3 4; 3 4 5; 4 5 6; 5 6 7; 6 7 8; 7 8 9; 8 9 10; 9 10 11; 10 11 12;
11 12 1; 12 1 14; 14 14 15; 15 16 17; 16 18 19; 17 20 18; 18 21 20; 19 22 21;
20 23 22; 21 24 23; 22 25 24; 23 26 25; 24 27 26; 25 28 27; 26 29 28; 27 17 29;
28 19 30; 29 31 32; 30 33 34; 31 32 35; 32 34 36; 33 35 37; 34 36 38; 35 37 39;
36 38 40; 37 39 41; 38 40 42; 39 41 43; 40 42 44; 41 43 45; 42 44 46; 43 45 47;
44 46 48; 45 47 49; 46 48 50; 47 49 2; 48 50 51; 49 2 54; 50 51 53; 52 53 55;
53 54 56; 54 55 57; 55 57 30; 56 3 16; 57 3 17; 58 17 4; 59 17 5; 60 5 29;
61 6 28; 62 5 28; 63 27 7; 64 28 7; 65 8 26; 66 9 25; 67 7 26; 68 24 10;
69 26 9; 70 11 23; 71 12 22; 72 9 24; 73 21 1; 74 24 11; 75 14 20; 76 15 18;
77 31 33; 78 31 34; 79 34 32; 80 34 35; 81 35 36; 82 37 38; 83 35 38; 84 40 39;
85 38 39; 86 41 42; 87 43 44; 88 39 42; 89 46 45; 90 42 43; 91 47 48; 92 49 50;
93 43 46; 94 51 2; 95 46 47; 96 54 53; 97 56 55; 98 15 58; 99 56 59; 100 58 60;
101 59 60; 102 11 22; 103 22 1; 104 1 20; 105 20 15; 106 47 50; 107 50 2;
108 2 53; 109 53 56; 110 15 19; 111 56 57; 112 19 58; 113 57 59;
DEFINE MATERIAL START
ISOTROPIC STEEL
E 29000
POISSON 0.3
DENSITY 0.000283
ALPHA 6e-06
DAMP 0.03
TYPE STEEL
STRENGTH FY 36 FU 58 RY 1.5 RT 1.2
END DEFINE MATERIAL
MEMBER TENSION
1
MEMBER TRUSS 
57 59 62 64 67 69 72 74 78 80 83 85 88 90 93 95 102 TO 111
UNIT FEET KIP
MEMBER PROPERTY AMERICAN
1 TO 12 14 TO 27 29 TO 50 52 TO 54 56 TO 99 102 TO 113 TABLE ST PIPS25
28 55 100 101 TABLE ST PIPS30
UNIT INCHES KIP
CONSTANTS
MATERIAL STEEL MEMB 1 TO 12 14 TO 50 52 TO 113
SUPPORTS
3 PINNED
31 FIXED BUT FX
UNIT FEET KIP
LOAD 1 LOADTYPE None  TITLE GRAVITY (D+L OR S)
MEMBER LOAD
15 TO 28 30 32 34 36 38 40 42 44 46 48 50 52 54 55 UNI GY -0.43
SELFWEIGHT Y -1 LIST ALL
LOAD 2 LOADTYPE None  TITLE UPLIFT (0.6D+0.6W)
MEMBER LOAD
15 TO 28 30 32 34 36 38 40 42 44 46 48 50 52 54 55 UNI GY 0.13
PERFORM ANALYSIS PRINT ALL
PARAMETER 1
CODE AISC UNIFIED 2010
METHOD ASD
FYLD 5184 MEMB 1 TO 12 14 TO 50 52 TO 113
CHECK CODE MEMB 1 TO 12 14 TO 50 52 TO 113
PRINT ALL
FINISH

Client provided this design for a pole barn Truss. Every member in Truss is welded and Truss is welded to pipe columns that are embedded. Wanted to confirm I am analyzing this correctly before I tell him we have to completely redesign the Truss layout. Thank you.

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Mon, 29 Mar 2021 02:17:03 GMT

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