Hello Everyone,
I have analyzed and designed overhead transmission tower by IS 802 code. I am getting a warning message that " The member is not a Truss member" The member has been designed considering axial force only. How to avoid this warning message.
The design as per IS:802 is carried out for axial load only and so when designing the members, the software is expecting only axial forces to be present in the members, which is what happens when these are specified as TRUSS members. If you have not declared these as TRUSS members, these members would have moments/shears and in such cases you will get warnings like these.
STAAD TRUSSSTART JOB INFORMATIONENGINEER DATE 14-Jun-17END JOB INFORMATIONINPUT WIDTH 79UNIT METER KNJOINT COORDINATES1 0 0 0; 2 0 0 5; 3 5 0 5; 4 5 0 0; 5 1 5 1; 6 1 5 4; 7 4 5 1; 8 4 5 4;9 1 6 1; 10 1 6 4; 11 4 6 1; 12 4 6 4; 13 1 7 1; 14 1 7 4; 15 4 7 1; 16 4 7 4;17 1 8 1; 18 1 8 4; 19 4 8 1; 20 4 8 4; 21 1 9 1; 22 1 9 4; 23 4 9 1; 24 4 9 4;25 1 10 1; 26 1 10 4; 27 4 10 1; 28 4 10 4;MEMBER INCIDENCES1 2 6; 2 1 5; 3 4 7; 4 3 8; 5 6 8; 6 6 5; 7 5 7; 8 8 7; 9 5 9; 10 6 10;11 7 11; 12 8 12; 13 9 13; 14 10 14; 15 11 15; 16 12 16; 17 13 17; 18 14 18;19 15 19; 20 16 20; 21 17 21; 22 18 22; 23 19 23; 24 20 24; 25 21 25; 26 22 26;27 23 27; 28 24 28; 29 9 11; 30 10 12; 31 13 15; 32 14 16; 33 17 19; 34 18 20;35 21 23; 36 22 24; 37 25 27; 38 26 28; 39 9 10; 40 11 12; 41 13 14; 42 15 16;43 17 18; 44 19 20; 45 21 22; 46 23 24; 47 25 26; 48 27 28;DEFINE MATERIAL STARTISOTROPIC STEELE 2.05e+008POISSON 0.3DENSITY 76.8195ALPHA 1.2e-005DAMP 0.03TYPE STEELSTRENGTH FY 253200 FU 407800 RY 1.5 RT 1.2END DEFINE MATERIALMEMBER PROPERTY INDIAN1 TO 48 TABLE LD ISA150X150X16CONSTANTSMATERIAL STEEL ALLSUPPORTS1 TO 4 FIXEDMEMBER TRUSS 1 TO 48LOAD 1 LOADTYPE Dead TITLE DLSELFWEIGHT Y -1 LOAD 2 LOADTYPE Live REDUCIBLE TITLE LLJOINT LOAD25 TO 28 FY -25LOAD COMB 3 Generated Indian Code Genral_Structures 11 1.5 2 1.5 LOAD COMB 4 Generated Indian Code Genral_Structures 21 1.2 2 1.2 LOAD COMB 5 Generated Indian Code Genral_Structures 31 1.5 LOAD COMB 6 Generated Indian Code Genral_Structures 41 0.9 PERFORM ANALYSIS PRINT ALLPARAMETER 1CODE IS802CNSF 0 ALLDANGLE 0 ALLDBL 0.012 ALLDMAX 1000 ALLDMIN 0 ALLELA 2 ALLFVB 218000 ALLFYB 436000 ALLFYLD 250000 ALLGALVA 0 ALLGALVA 0 ALLGUSSET 0.005 ALLKY 1 ALLKZ 1 ALLLEG 2 ALLLY 0 ALLLZ 0 ALLMAIN 1 ALLNHL 0 ALLNSF 1 ALLTRACK 0 ALLCHECK CODE ALLPARAMETER 2CODE IS802FIXED GROUPPARAMETER 3CODE IS802GROUP MEMB 1 TO 48 PARAMETER 4CODE IS802GROUP SY MEMB 1 TO 48 PARAMETER 5CODE IS802GROUP AX MEMB 1 TO 48 PARAMETER 6CODE IS802STEEL MEMBER TAKE OFF ALLPARAMETER 7CODE IS802SELECT ALLPARAMETER 8CODE IS802SELECT OPTIMIZEDPARAMETER 9CODE IS802STEEL TAKE OFF ALLFINISH
Thanks for your reply sir,
Even after changing it to truss members also it showing warning like "instability of joint" in the Direction FZ, and Note as very week spring added for stability