Hi All. Recently I have been trying to analyze and model an OWSJ. Fortunately I have joist loads and member forces from the manufacturer to compare my results with. But despite multiple tries, I'm not able to get same results (which should be the case). I would appreciate it if you could respond to following queries. 1. Per CANAM Joist Tables, many of the angle and U sestions used are not available in the STAAD Pro library. But when I tried to define a section using use defined table option the analysis did not proceed due to an error "Unable to read table". How can I adress this issue? You can show me by defining member U1x1.1x0.118 from this manual https://www.canam-construction.com/wp-content/uploads/2014/12/15-3296-canam-joist-girder-catalogue-canada-mise-a-jour-07-2015web4.pdf.
2. The member forces I'm getting are within 10% of those obtained from CANAM design. However, for secondary webs, the difference is huge (upto 65%). Why is this happening? |3. Desite the fact that the member forces are compareable to the manufactuirers results, the utility ratio I'm getting from STAAD vary greatly. Why is this? I'm using CSA S16 design code. My Model:
STAAD SPACE START JOB INFORMATION ENGINEER DATE 28-Aug-22 END JOB INFORMATION INPUT WIDTH 79 UNIT FEET POUND JOINT COORDINATES 1 0.08 0 0; 2 2.416 0 0; 3 4.833 0 0; 4 6.5 0 0; 5 8.167 0 0; 6 9.833 0 0; 7 11.5 0 0; 8 13.0167 0 0; 9 14.833 0 0; 10 16.5 0 0; 11 18.166 0 0; 12 19.833 0 0; 13 21.5 0 0; 14 23.9167 0 0; 15 26.42 0 0; 16 27.75 0 0; 17 0.08 -2 0; 18 3.667 -2 0; 19 6.5 -2 0; 20 9.833 -2 0; 21 13.167 -2 0; 22 16.5 -2 0; 23 19.833 -2 0; 24 22.667 -2 0; 25 26.4167 -2 0; MEMBER INCIDENCES 1 1 2; 2 2 3; 3 3 4; 4 4 5; 5 5 6; 6 6 7; 7 7 8; 8 8 9; 9 9 10; 10 10 11; 11 11 12; 12 12 13; 13 13 14; 14 14 15; 15 15 16; 16 17 18; 17 18 19; 18 19 20; 19 20 21; 20 21 22; 21 22 23; 22 23 24; 23 24 25; 26 2 18; 27 4 19; 28 6 20; 29 8 21; 30 10 22; 31 12 23; 32 14 24; 33 3 18; 34 5 19; 35 7 20; 36 9 22; 37 11 23; 38 13 24; 39 3 19; 40 5 20; 41 7 21; 42 9 21; 43 11 22; 44 13 23; 46 1 18; 47 24 15; START USER TABLE TABLE 1 UNIT FEET POUND DOUBLE ANGLE 1.5X1.5X0.156 0.125 0.125 0.013 0.125 9.08925e-006 8.92631e-005 3.47126e-007 0.0360359 - 0.00325 0.00325 0 LL1.5X1.5X0.1875 0.125 0.125 0.015625 0.041667 1.06076e-005 3.58409e-005 5.96046e-007 - 0.0369792 0.00390625 0.00390625 0 TABLE 2 UNIT FEET POUND CHANNEL U1X1.1X0.0118 0.000412956 0.083333 0.001567 0.091667 0.001567 5.4759e-007 3.78626e-007 - 3.38003e-010 0.0321238 0.000130583 0.000191523 U1X0.85X0.090 0.00166874 0.070833 0.0075 0.083333 0.0075 1.36809e-006 1.17628e-006 - 3.12889e-008 0.0321519 0.000531247 0.00083333 U1X1X0.118 0.00226486 0.083333 0.009833 0.083333 0.009833 2.43801e-006 1.56523e-006 - 7.2995e-008 0.0315083 0.000819413 0.00109255 END SUPPORTS 1 PINNED 15 FIXED BUT FX FZ MX MY MZ DEFINE MATERIAL START ISOTROPIC STEEL E 4.176e+009 POISSON 0.3 DENSITY 489.024 ALPHA 6e-006 DAMP 0.03 TYPE STEEL STRENGTH FY 7.92e+006 FU 9.852e+006 RY 1.5 RT 1.2 G 1.60615e+009 END DEFINE MATERIAL MEMBER PROPERTY AMERICAN 1 TO 23 TABLE SD L1.5X1.5X0.156 SP 0.0625 MEMBER PROPERTY AMERICAN 46 47 PRIS YD 0.083333 26 TO 44 TABLE ST U1X1X0.118 CONSTANTS BETA 180 MEMB 16 TO 23 MATERIAL STEEL ALL MEMBER RELEASE 46 47 START MY MZ 46 47 END MY MZ MEMBER TRUSS 26 TO 44 LOAD 1 LOADTYPE Dead TITLE DEAD MEMBER LOAD 1 TO 15 UNI GY -216 SELFWEIGHT Y -1 LIST ALL LOAD 2 LOADTYPE Snow TITLE SNOW MEMBER LOAD 1 TO 15 UNI GY -228 JOINT LOAD 18 21 24 FY -2000 LOAD 3 LOADTYPE Live TITLE LIVE LOAD 4 LOADTYPE Wind TITLE WIND UPLIFT MEMBER LOAD 1 TO 15 UNI GY 247.2 LOAD COMB 5 Generated NBC 2005 ULS 1 1 1.4 LOAD COMB 6 Generated NBC 2005 ULS 2 1 1.25 3 1.5 LOAD COMB 7 Generated NBC 2005 ULS 3 1 1.25 3 1.5 2 0.5 LOAD COMB 8 Generated NBC 2005 ULS 4 1 1.25 3 1.5 4 0.4 LOAD COMB 9 Generated NBC 2005 ULS 5 1 0.9 3 1.5 LOAD COMB 10 Generated NBC 2005 ULS 6 1 0.9 3 1.5 2 0.5 LOAD COMB 11 Generated NBC 2005 ULS 7 1 0.9 3 1.5 4 0.4 LOAD COMB 12 Generated NBC 2005 ULS 8 1 1.25 2 1.5 LOAD COMB 13 Generated NBC 2005 ULS 9 1 1.25 3 0.5 2 1.5 LOAD COMB 14 Generated NBC 2005 ULS 10 1 1.25 4 0.4 2 1.5 LOAD COMB 15 Generated NBC 2005 ULS 11 1 0.9 2 1.5 LOAD COMB 16 Generated NBC 2005 ULS 12 1 0.9 3 0.5 2 1.5 LOAD COMB 17 Generated NBC 2005 ULS 13 1 0.9 4 0.4 2 1.5 LOAD COMB 18 Generated NBC 2005 ULS 14 1 1.25 4 1.4 LOAD COMB 19 Generated NBC 2005 ULS 15 1 1.25 3 0.5 4 1.4 LOAD COMB 20 Generated NBC 2005 ULS 16 1 1.25 4 1.4 2 0.5 LOAD COMB 21 Generated NBC 2005 ULS 17 1 0.9 4 1.4 LOAD COMB 22 Generated NBC 2005 ULS 18 1 0.9 3 0.5 4 1.4 LOAD COMB 23 Generated NBC 2005 ULS 19 1 0.9 4 1.4 2 0.5 LOAD COMB 24 Generated NBC 2005 ULS 20 1 1.0 3 0.5 2 0.25 PERFORM ANALYSIS PARAMETER 1 CODE CANADIAN PARAMETER 2 CODE CANADIAN FYLD 7.92e+006 MEMB 1 TO 23 26 TO 44 CHECK CODE MEMB 1 TO 23 26 TO 44 FINISH