hi,
Currently i am working on a steel roof truss project of 18m span and 9m depth. the truss shape is as per sketch below. chord members and struts are back-to-back angle. diagonal ties are flat bars. Connection is with gusset plate with rivets. truss is supporting clay roof tile.
I have some queries and hope to have some technical guidance:-
1. the material used for analysis is S235 even i have changed the steel strength to 275N/mm2.
2. if assigning parameter py = 275N/mm2 and/or SGR - S275, will have warning signs for all compression members and unable to analyse.
3. In order to check LTB, which are the parameters i need to specify? KY and KZ, or LY and LZ, or UNF and UNL? Or all?
STAAD SPACE START JOB INFORMATION ENGINEER DATE 01-Jul-17 JOB NAME Roof Truss JOB CLIENT XXX JOB NO XXX JOB REV 0 JOB PART Roof Truss T1 ENGINEER NAME XXX END JOB INFORMATION INPUT WIDTH 79 UNIT METER KN JOINT COORDINATES 1 0 0 0; 2 5.62 3.245 0; 3 12.11 3.245 0; 4 17.73 0 0; 5 8.865 8.865 0; 6 8.865 3.245 0; 7 4.4325 4.4325 0; 8 13.2975 4.4325 0; 9 3.23713 1.86913 0; 10 14.4929 1.86913 0; 11 6.99709 5.62998 0; 12 10.7329 5.62998 0; 13 2.55313 2.55313 0; 14 6.31354 6.31354 0; 15 15.1769 2.55313 0; 16 11.4165 6.31354 0; MEMBER INCIDENCES 1 1 9; 2 4 10; 3 2 6; 4 1 13; 5 4 15; 6 2 11; 7 3 12; 8 6 3; 9 5 6; 10 7 14; 11 2 7; 12 8 16; 13 3 8; 14 9 2; 15 10 3; 16 11 5; 17 12 5; 18 13 7; 19 9 13; 20 14 5; 21 11 14; 22 15 8; 23 10 15; 24 16 5; 25 12 16; 26 7 9; 27 7 11; 28 8 10; 29 8 12; START USER TABLE TABLE 1 FLAT_FS.UPT END DEFINE MATERIAL START ISOTROPIC STEEL E 2.05e+008 POISSON 0.3 DENSITY 78.4264 ALPHA 1.2e-005 DAMP 0.03 TYPE STEEL STRENGTH FY 275000 FU 407800 RY 1.5 RT 1.2 END DEFINE MATERIAL MEMBER PROPERTY BRITISH 9 TABLE ST UA65X60X7 MEMBER PROPERTY BRITISH 3 6 TO 8 11 13 16 17 19 21 23 25 TABLE LD UA75X75X8 SP 0.0127 1 2 4 5 10 12 14 15 18 20 22 24 TABLE LD UA100X75X8 SP 0.0127 MEMBER PROPERTY BRITISH 26 TO 29 UPTABLE 1 FLAT CONSTANTS BETA 180 MEMB 1 TO 3 6 TO 8 14 TO 17 BETA 90 MEMB 26 TO 29 MATERIAL STEEL ALL SUPPORTS 1 PINNED 4 FIXED BUT FX MX MY MZ ****** LOAD 1 LOADTYPE Dead TITLE DL SELFWEIGHT Y -1 MEMBER LOAD 10 12 CON GY -3.64 0 10 12 CON GY -3.64 1.22 10 12 CON GY -3.64 2.44 20 24 CON GY -3.64 1 20 24 CON GY -3.64 2.22 18 22 CON GY -3.64 0.22 18 22 CON GY -3.64 1.44 4 5 CON GY -1.82 0.17 4 5 CON GY -3.64 1.39 4 5 CON GY -3.64 2.61 JOINT LOAD 5 FY -0.52 MEMBER LOAD 3 CON GY -1.32 2.1 3 CON GY -1.32 3.1 1 2 UNI GY -0.74 JOINT LOAD 9 10 FY -5.66 LOAD 2 LOADTYPE Live TITLE LL JOINT LOAD 3 FY -1.76 LOAD 3 LOADTYPE Wind TITLE WL MEMBER LOAD 10 12 CON GY -0.52 0 10 12 CON GY -0.52 1.22 10 12 CON GY -0.52 2.44 20 24 CON GY -0.52 1 20 24 CON GY -0.52 2.22 18 22 CON GY -0.52 0.22 18 22 CON GY -0.52 1.44 4 5 CON GY -0.26 0.17 4 5 CON GY -0.52 1.39 4 5 CON GY -0.52 2.61 LOAD COMB 20 1.35DL+1.5WL 1 1.35 3 1.5 PERFORM ANALYSIS PRINT ALL ********** LOAD LIST 20 PARAMETER 1 CODE EN 1993-1-1:2005 LY 1.22 MEMB 4 5 10 12 18 20 22 24 LZ 2.527 MEMB 4 5 LZ 2.66 MEMB 10 12 18 22 LZ 1.805 MEMB 20 24 PY 275000 ALL SGR 1 ALL TRACK 2 ALL CHECK CODE MEMB 4 5 10 12 18 20 22 24 CHECK CODE MEMB 1 TO 3 6 TO 9 11 13 TO 17 19 21 23 25 TO 29 FINISH