Please see STAAD input command below. I try to change DFF parameter in any value (not 0) but the result still show all member pass all code check.
Please verify if I'm wrong...
Best regard.
STAAD SPACESTART JOB INFORMATIONENGINEER DATE 06-Feb-16END JOB INFORMATIONINPUT WIDTH 79UNIT METER KGJOINT COORDINATES1 0 5 0; 2 10 5 0; 3 0 4.91 1.7; 4 10 4.91 1.7; 5 0 4.93656 1.19832;6 10 4.93656 1.19832; 7 0 3.8 0; 8 10 3.8 0; 9 0 4.99207 0.14979;10 10 4.99207 0.14979; 11 0 4.9511 0.923706; 12 10 4.9511 0.923706;MEMBER INCIDENCES1 1 9; 2 2 10; 3 3 4; 4 5 3; 5 6 4; 6 7 5; 7 8 6; 8 9 11; 9 10 12; 10 9 10;11 11 5; 12 12 6; 13 11 12;START GROUP DEFINITIONFLOOR_CP1 3 TO 5 8 TO 13END GROUP DEFINITIONDEFINE MATERIAL STARTISOTROPIC STEELE 2.09042e+010POISSON 0.3DENSITY 7833.41ALPHA 1.2e-005DAMP 0.03TYPE STEELSTRENGTH FY 2.58192e+007 FU 4.1584e+007 RY 1.5 RT 1.2END DEFINE MATERIALMEMBER PROPERTY JAPANESE1 2 4 5 8 9 11 12 TABLE ST C150X75X93 10 13 TABLE ST RHS150X75X2.36 7 TABLE ST C100X50X5CONSTANTSBETA 180 MEMB 2 5 7 9 12MATERIAL STEEL ALLSUPPORTS1 2 7 8 PINNEDLOAD 1 LOADTYPE None TITLE DLSELFWEIGHT Y -1 FLOOR LOAD_CP1 FLOAD -10 GYLOAD 2 LOADTYPE None TITLE LRFLOOR LOAD_CP1 FLOAD -30 GYLOAD 3 LOADTYPE None TITLE WXFLOOR LOAD_CP1 FLOAD 50 GYLOAD 4 LOADTYPE None TITLE WZFLOOR LOAD_CP1 FLOAD 70 GYLOAD COMB 101 DL+LR1 1.0 2 1.0 LOAD COMB 102 DL+0.75[LR+WX]1 1.0 2 0.75 3 0.75 LOAD COMB 103 DL+0.75[LR+WZ]1 1.0 2 0.75 4 0.75LOAD COMB 104 DL+WX1 1.0 3 1.0 LOAD COMB 105 DL+WZ1 1.0 4 1.0 LOAD COMB 106 0.6DL+WX1 0.6 3 1.0 LOAD COMB 107 0.6DL+WZ1 0.6 4 1.0 PERFORM ANALYSISLOAD LIST 101 TO 107PARAMETER 1CODE AISC UNIFIED 2005METHOD ASDMAIN 1 MEMB 3 10 13TMAIN 1 MEMB 3 10 13*LY 5 MEMB 3 10 13DFF 1000 MEMB 3 10 13DJ1 9 MEMB 10DJ2 12 MEMB 10CHECK CODE ALLFINISH
What different of command?. LOAD LIST 101 TO 107 and LOAD LIST ENVELOPE 1 which Envelope 1 include load no. 101 to 107 ? I remember that I ever use this command in SS4 without define any envelope. STAAD can check code and check the deflection.
Does it's mean in the SS6 we must define and evelope for check deflection limit
and for steel design code check we must define envelope or not for the correct result ?.
With most of my code only use LOAD LIST ... TO ... command.
Regard.
I check about load list command with or without ENVELOPE. When I use code check command without deflection check as below .... LOAD LIST ENVELOPE 1 PARAMETER 1 CODE AISC UNIFIED 2005METHODE ASD CHECK CODE ALL ... There are no result from steel design code check. but if use .... LOAD LIST 101 TO 107 PARAMETER 1CODE AISC UNIFIED 2005METHODE ASD CHECK CODE ALL
... There are stress ratio results from steel design check. and for the deflection check .... LOAD LIST ENVELOPE 1 PARAMETER 1 CODE AISC UNIFIED 2005METHODE ASD DFF 240 MEM ..... CHECK CODE ALL ... There are results from steel design code check of member with have DFF assign. but for member without DFF there are no result. This is an improvement? I think this make user confuse to use ENVELOPE or LIST and go backward. For the member that need code check both stress ratio and deflection we must check code 2 times? 1 time for deflection only and another for stress ratio and which one controlled the design? Regard.
** I add "METHODE ASD" to clear my question.
There has been an update in the program to specifically impel the users to create two different type of envelops- Service and Strength to cater two different aspect of design- deflection checking with Service Envelop and member design using Strength Envelop. This provides a clear vision on design aspect.
You need to create two different envelops- one for strength and another for service. Service load envelop is to be used for deflection check and Strength load envelops are to be used for member design where you will find the stress checking.
Please have a look into the following:
communities.bentley.com/.../92764
communities.bentley.com/.../23987.serviceability-and-strength-check-for-the-same-load-combination
I have attached a modified file with SERVICE and STRENGTH envelopes which has subsequently been used to do a CODE CHECK.
Here are some points which should be noted.
1. For both service and strength and checks to be carried out, you have to have 2 separate envelopes. In the attached model, you will find 2 separate envelopes namely service ( cases 101 to 107 ) and strength ( cases 201 to 207 ).
2. The LOAD LIST ENV 1 2 has been used just before the design so that the design accounts for both envelopes during design.
3. DFF has to be specified as part of the design parameters if deflection check is to be carried out. This is in addition to defining the service envelope. Since you specified DFF for members 3 10 and 13, the deflection check will be carried out for these members only. If you need to check other members for deflection, specify DFF for those too.
4. Since you need the same combos to be checked for service and strength (ASD), you need to add the combos 201 to 207 which are basically same load combos as 101 to 107 but still needed as STAAD.Pro cannot consider same load combos for both service and strength envelopes.
I hope this helps.
2330.Structure1_rev.std