Hello--
I'm running STAAD.Pro Advanced CONNECT Edition - Version 21.03.00.146.
I have an I-shaped, built-up member that is singly symmetric and was created using the User Table. When I do a code check on the member using AISC 2010 METHOD ASD, STAAD checks the member for flexure using the AISC provisions in F2 which only applies to doubly symmetric members. The built-up member should be checked utilizing the AISC provisions in F4 since it is singly symmetric.
Do I need to assign the member as singly symmetric? I assume STAAD should do this automatically based on the properties assigned in the user table.
Any help is appreciated!
There is nothing specific that you need to do to tell the software that the section is singly symmetric. One thing that I would suggest is using the latest ver 22.04.00.40. If you still run into the same issue using that version, please upload the model and we will look into it further.
I am unable to utilize the latest version due to software constraints for my organization. Is this a reported bug in the software version I am using? This results in an unconservative design. Can you run a singly symmetric built-up section using the latest version and verify that it is using the correct code check?
Please upload your model and mention the member number and I will check using the latest version.
STAAD SPACE START JOB INFORMATION ENGINEER DATE 27-Jan-20 JOB NAME Closure Centerposts for SWL END JOB INFORMATION INPUT WIDTH 79 UNIT FEET KIP JOINT COORDINATES 1 0 0 0; 2 0 2.33333 0; 3 0 5.25 0; 5 0 8.5 0; 6 0 11.75 0; 7 0 15 0; 8 0 18.25 0; 9 0 21.5 0; 10 0 23.5 0; 11 0 24.75 0; 12 0 28 0; 13 0 31.25 0; 14 0 34.5 0; 15 0 36.5 0; 16 3 23.5 0; 17 3 5.25 0; 18 11.76 16.93 0; 19 34.3333 0 0; 20 10.7667 17.675 0; 21 17.033 12.975 0; 22 23.3 8.275 0; 23 29.5667 3.575 0; 24 0 0 7.25; 25 0 2.33333 7.25; 26 0 5.25 7.25; 27 0 8.5 7.25; 28 0 11.75 7.25; 29 0 15 7.25; 30 0 18.25 7.25; 31 0 21.5 7.25; 32 0 23.5 7.25; 33 0 24.75 7.25; 34 0 28 7.25; 35 0 31.25 7.25; 36 0 34.5 7.25; 37 0 36.5 7.25; 38 3 23.5 7.25; 39 3 5.25 7.25; 40 11.76 16.93 7.25; 41 34.3333 0 7.25; 42 10.7667 17.675 7.25; 43 17.033 12.975 7.25; 44 23.3 8.275 7.25; 45 29.5667 3.575 7.25; 46 4.5 22.375 0; 47 4.5 22.375 7.25; 48 1.1375 2.33333 0; 49 1.1375 5.25 0; 50 1.1375 8.5 0; 51 1.1375 11.75 0; 52 1.1375 15 0; 53 1.1375 18.25 0; 54 1.1375 21.5 0; 55 1.1375 23.5 0; 56 1.1375 24.75 0; 57 1.1375 28 0; 58 1.1375 31.25 0; 59 1.1375 34.5 0; 60 1.1375 2.33333 7.25; 61 1.1375 5.25 7.25; 62 1.1375 8.5 7.25; 63 1.1375 11.75 7.25; 64 1.1375 15 7.25; 65 1.1375 18.25 7.25; 66 1.1375 21.5 7.25; 67 1.1375 23.5 7.25; 68 1.1375 24.75 7.25; 69 1.1375 28 7.25; 70 1.1375 31.25 7.25; 71 1.1375 34.5 7.25; 72 0 35.3333 0; 73 0 35.3333 7.25; MEMBER INCIDENCES 1 1 19; 2 1 2; 3 2 3; 4 3 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 72; 15 16 46; 16 20 18; 17 18 21; 18 21 22; 19 22 23; 20 23 19; 21 17 18; 22 24 41; 23 24 25; 24 25 26; 25 26 27; 26 27 28; 27 28 29; 28 29 30; 29 30 31; 30 31 32; 31 32 33; 32 33 34; 33 34 35; 34 35 36; 35 36 73; 36 38 47; 37 42 40; 38 40 43; 39 43 44; 40 44 45; 41 45 41; 42 39 40; 43 47 46; 44 42 20; 45 43 21; 46 44 22; 47 45 23; 48 42 46; 49 43 20; 50 44 21; 51 45 22; 52 25 2; 53 26 3; 54 27 5; 55 28 6; 56 29 7; 57 30 8; 58 31 9; 59 33 11; 60 34 12; 61 35 13; 62 36 14; 63 47 42; 64 46 20; 76 72 15; 77 73 37; ELEMENT INCIDENCES SHELL 65 48 49 61 60; 66 49 50 62 61; 67 50 51 63 62; 68 51 52 64 63; 69 52 53 65 64; 70 53 54 66 65; 71 54 55 67 66; 72 55 56 68 67; 73 56 57 69 68; 74 57 58 70 69; 75 58 59 71 70; START USER TABLE TABLE 1 WIDE FLANGE PG_VERT 0.746529 4.29167 0.0833333 1.5 0.166667 2.16456 0.0609549 0.00462161 - 0.357639 0.277778 1 0.166667 TABLE 3 TEE ST5X12.7 0.025903 0.416667 0.3883 0.0409167 0.02583 0.00037664 0.00016348 2.53183e-05 - 0.128333 0.0152778 0.01625 END UNIT INCHES KIP ELEMENT PROPERTY 65 66 THICKNESS 0.5 67 TO 75 THICKNESS 0.4375 UNIT FEET KIP DEFINE MATERIAL START ISOTROPIC STEEL E 4.176e+06 POISSON 0.3 DENSITY 0.489024 ALPHA 6.5e-06 DAMP 0.03 TYPE STEEL STRENGTH RY 1.5 RT 1.2 ISOTROPIC STEEL_36_KSI E 4.176e+06 POISSON 0.3 DENSITY 0.489024 ALPHA 6.5e-06 DAMP 0.03 TYPE STEEL STRENGTH FY 5184 FU 8352 RY 1.5 RT 1.2 END DEFINE MATERIAL UNIT INCHES POUND MEMBER PROPERTY AMERICAN 52 TO 62 TABLE ST W12X45 MEMBER PROPERTY AMERICAN 21 42 TABLE ST W8X20 1 22 TABLE ST W10X66 15 TO 20 36 TO 41 63 64 TABLE ST W14X136 UNIT INCHES KIP MEMBER PROPERTY AMERICAN 43 47 TABLE ST C12X20 MEMBER PROPERTY AMERICAN 2 TO 14 23 TO 35 76 77 UPTABLE 1 PG_VERT MEMBER PROPERTY AMERICAN 44 TO 46 48 TO 51 UPTABLE 3 ST5X12.7 UNIT FEET KIP CONSTANTS BETA 36.87 MEMB 43 TO 51 BETA 90 MEMB 52 TO 62 MATERIAL STEEL_36_KSI ALL UNIT INCHES POUND MEMBER RELEASE 15 21 36 42 START MY MZ 20 21 41 42 END MY MZ MEMBER OFFSET 1 22 START LOCAL 15 0 0 21 42 END LOCAL -12.875 0 0 20 41 END LOCAL -55 0 0 44 TO 46 48 TO 51 START LOCAL 0 6.312 0 44 TO 46 48 TO 51 END LOCAL 0 6.312 0 52 TO 62 START 19.95 0 0 52 TO 62 END 19.95 0 0 SUPPORTS 19 41 FIXED 1 24 PINNED SLAVE RIGID MASTER 3 JOINT 17 49 SLAVE RIGID MASTER 10 JOINT 16 55 SLAVE RIGID MASTER 26 JOINT 39 61 SLAVE RIGID MASTER 32 JOINT 38 67 UNIT INCHES KIP SLAVE RIGID MASTER 2 JOINT 48 SLAVE RIGID MASTER 5 JOINT 50 SLAVE RIGID MASTER 6 JOINT 51 SLAVE RIGID MASTER 7 JOINT 52 SLAVE RIGID MASTER 8 JOINT 53 SLAVE RIGID MASTER 9 JOINT 54 SLAVE RIGID MASTER 11 JOINT 56 SLAVE RIGID MASTER 12 JOINT 57 SLAVE RIGID MASTER 13 JOINT 58 SLAVE RIGID MASTER 14 JOINT 59 SLAVE RIGID MASTER 25 JOINT 60 SLAVE RIGID MASTER 27 JOINT 62 SLAVE RIGID MASTER 28 JOINT 63 SLAVE RIGID MASTER 29 JOINT 64 SLAVE RIGID MASTER 30 JOINT 65 SLAVE RIGID MASTER 31 JOINT 66 SLAVE RIGID MASTER 33 JOINT 68 SLAVE RIGID MASTER 34 JOINT 69 SLAVE RIGID MASTER 35 JOINT 70 SLAVE RIGID MASTER 36 JOINT 71 UNIT INCHES POUND LOAD 3 LOADTYPE Gravity TITLE HYDROSTATIC_366IN UNIT FEET KIP MEMBER LOAD 2 23 TRAP GX 57.2546 52.8745 3 24 TRAP GX 52.8745 47.3993 4 25 TRAP GX 47.3993 41.2984 5 26 TRAP GX 41.2984 35.1975 6 27 TRAP GX 35.1975 29.0966 7 28 TRAP GX 29.0966 22.9957 8 29 TRAP GX 22.9957 16.8948 9 30 TRAP GX 16.8948 13.1404 10 31 TRAP GX 13.1404 10.7939 11 32 TRAP GX 10.7939 4.693 12 33 TRAP GX 4.693 0 0 2.5 LOAD 56 LOADTYPE Dead TITLE DEAD LOAD SELFWEIGHT Y -1 LOAD 68 LOADTYPE None TITLE DESIGN IMPACT LOAD_366IN MEMBER LOAD 14 35 76 77 UNI GX 76.2 LOAD 1 LOADTYPE None TITLE HYDROSTATIC_360IN MEMBER LOAD 2 23 TRAP GX 56.316 51.9359 3 24 TRAP GX 51.9359 46.4607 4 25 TRAP GX 46.4607 40.3598 5 26 TRAP GX 40.3598 34.2589 6 27 TRAP GX 34.2589 28.158 7 28 TRAP GX 28.158 22.0571 8 29 TRAP GX 22.0571 15.9562 9 30 TRAP GX 15.9562 12.2018 10 31 TRAP GX 12.2018 9.8553 11 32 TRAP GX 9.8553 3.7544 12 33 TRAP GX 3.7544 0 0 2 LOAD 2 LOADTYPE None TITLE DESIGN IMPACT LOAD_360IN MEMBER LOAD 77 UNI GX 76.2 0 0.666667 35 UNI GX 76.2 0 0.833333 76 UNI GX 76.2 0 0.666667 14 UNI GX 76.2 0 0.833333 13 34 UNI GX 76.2 2.75 3.25 LOAD 4 LOADTYPE None TITLE HYDROSTATIC_336IN MEMBER LOAD 2 23 TRAP GX 52.5616 48.1815 3 24 TRAP GX 48.1815 42.7063 4 25 TRAP GX 42.7063 36.6054 5 26 TRAP GX 36.6054 30.5045 6 27 TRAP GX 30.5045 24.4036 7 28 TRAP GX 24.4036 18.3027 8 29 TRAP GX 18.3027 12.2018 9 30 TRAP GX 12.2018 8.4474 10 31 TRAP GX 8.4474 6.1009 11 32 TRAP GX 6.1009 0 LOAD 5 LOADTYPE None TITLE HYDROSTATIC_297IN MEMBER LOAD 2 23 TRAP GX 46.4607 42.0806 3 24 TRAP GX 42.0806 36.6054 4 25 TRAP GX 36.6054 30.5045 5 26 TRAP GX 30.5045 24.4036 6 27 TRAP GX 24.4036 18.3027 7 28 TRAP GX 18.3027 12.2018 8 29 TRAP GX 12.2018 6.1009 9 30 TRAP GX 6.1009 2.3465 LOAD 6 LOADTYPE None TITLE HYDROSTATIC_282IN MEMBER LOAD 2 23 TRAP GX 44.1142 39.7341 3 24 TRAP GX 39.7341 34.2589 4 25 TRAP GX 34.2589 28.158 5 26 TRAP GX 28.158 22.0571 6 27 TRAP GX 22.0571 15.9562 7 28 TRAP GX 15.9562 9.8553 8 29 TRAP GX 9.8553 3.7544 9 30 TRAP GX 3.7544 0 LOAD 7 LOADTYPE None TITLE DESIGN IMPACT LOAD_336IN MEMBER LOAD 13 34 UNI GX 76.2 0.75 2.75 LOAD 8 LOADTYPE None TITLE DESIGN IMPACT LOAD_297IN MEMBER LOAD 12 33 UNI GX 76.2 0.75 2.75 LOAD 9 LOADTYPE None TITLE DESIGN IMPACT LOAD_282IN MEMBER LOAD 12 33 UNI GX 76.2 0 1.5 11 32 UNI GX 76.2 2.75 3.25 LOAD COMB 10 HS+DEAD+DESIGN_IMPACT_360IN 56 1.0 1 1.0 2 1.0 LOAD COMB 11 HS+DEAD+DESIGN_IMPACT_336IN 4 1.0 7 1.0 56 1.0 LOAD COMB 12 HS+DEAD+DESIGN_IMPACT_297IN 56 1.0 5 1.0 8 1.0 LOAD COMB 13 HS+DEAD+DESIGN_IMPACT_282IN 56 1.0 6 1.0 9 1.0 LOAD COMB 69 HS+DESIGN_IMPACT_366IN 3 1.0 56 1.0 68 1.0 PERFORM ANALYSIS PRINT STATICS CHECK UNIT INCHES KIP LOAD LIST 69 PARAMETER 2 CODE AISC UNIFIED 2010 TRACK 2 ALL LX 5.25 MEMB 2 3 23 24 LZ 5.25 MEMB 2 3 23 24 LZ 12.2917 MEMB 10 TO 14 31 TO 35 76 77 LX 12.2917 MEMB 10 TO 14 31 TO 35 76 77 UNT 78 MEMB 2 TO 14 23 TO 35 76 77 UNB 39 MEMB 2 TO 14 23 TO 35 76 77 LZ 283 MEMB 17 TO 20 38 TO 41 LY 93 MEMB 16 17 37 38 LX 283 MEMB 17 TO 20 38 TO 41 LZ 63 MEMB 2 3 23 24 LZ 147.5 MEMB 10 TO 14 31 TO 35 76 77 LZ 234 MEMB 4 TO 9 25 TO 30 METHOD ASD CHECK CODE ALL FINISH
Refer to Beam #26. Track 2 in the output file shows Criteria Eq F2-1 for major axis bending.
I looked at it and agree that for the section type you have specified, it should check section F4 as opposed to F2. I need to send this to our development desk for further investigation.