How to let staadpro only check member deflection but not check member strength(stability)?
Hi, Sye
Thank you for the reply . I knew how to direct staadpro to check member under specified load cases(combination)
What i really wanted to know is how to forbid staadpro check member strength(stability), and only check and output deflection check result.
see below picture. is there a way to get that?
Regards
Hi, Ryan
I guess you have assigned Strength design parameters to beams, so Staadpro give you member strength check result.
If you want to only check and output deflection check result, please set the format:
************************************
**Load case for Deflection check**
LOAD LIST ENV 1
PARAMETER 1
***check code**
CODE AISC UNIFIED 2010
METHOD LRFD
**The DFF parameter is used to assign the allowable ratio of span/deflection. **
DFF 900 MEMB 331 336 341 346 349 TO 393
**The DJ1 and DJ2 parameters are used to identify the nodes at the extreme ends of the member to be evaluated for deflection. **
DJ2 249 MEMB 354 358 361 364 367 370 373 376 379 382
DJ1 245 MEMB 354 358 361 364 367 370 373 376 379 382
***Perform check code*
CHECK CODE MEMB 331 336 341 346 349 TO 393
**************************************
The design result is:
Answer Verified By: ryan li
Xingmin:
For your case, I think the deflection condition happened to be the critical ones, that is not correct all the time.
See attached file of a simple frame model.
I come to believe Staadpro will check member strength, no matter you provide strength design parameters or not. Anyone can confirm this? or your defferent thinking.
BTW, How to attach a file?
Thank you
STAAD PLANESTART JOB INFORMATIONENGINEER DATE 26-Jun-14END JOB INFORMATIONINPUT WIDTH 79UNIT METER KNJOINT COORDINATES1 0 0 0; 2 29.5 0 0; 3 0 11 0; 4 29.5 11 0; 5 14.75 11.7375 0;6 19.244 11.5128 0; 7 10.256 11.513 0; 8 5.128 11.2565 0; 9 24.372 11.2564 0;MEMBER INCIDENCES1 4 2; 2 3 1; 3 5 6; 4 5 7; 5 4 9; 6 3 8; 7 8 7; 8 9 6;UNIT MMS KNDEFINE MATERIAL STARTISOTROPIC STEELE 205POISSON 0.3DENSITY 7.68195e-008ALPHA 1.2e-005DAMP 0.03TYPE STEELSTRENGTH FY 0.2532 FU 0.4078 RY 1.5 RT 1.2END DEFINE MATERIALCONSTANTSMATERIAL STEEL ALL*MEMBER PROPERTY AMERICAN1 2 TAPERED 1100 8 450 320 125 6 TAPERED 1100 8 800 280 103 4 TAPERED 725 5 500 250 107 8 TAPERED 800 6 500 280 10UNIT METER KNSUPPORTS1 2 PINNEDLOAD 11 DLSELFWEIGHT Y -1.1 MEMBER LOAD3 TO 8 UNI GY -2LOAD 12 CGMEMBER LOAD3 TO 8 UNI GY -3LOAD 21 LLMEMBER LOAD3 TO 8 UNI GY -5.7LOAD 31 WLL1MEMBER LOAD2 UNI GX 3.1 8.8 112 UNI GX 3.1 6.6 8.82 UNI GX 3.1 4.4 6.62 UNI GX 3.1 2.2 4.42 UNI GX 3.1 0 2.24 6 7 UNI Y 12.43 5 8 UNI Y 8.11 UNI GX 6.8LOAD 32 WLL2MEMBER LOAD2 UNI GX 8.1 8.8 112 UNI GX 8.1 6.6 8.82 UNI GX 8.1 4.4 6.62 UNI GX 8.1 2.2 4.42 UNI GX 8.1 0 2.24 6 7 UNI Y 7.43 5 8 UNI Y 3.11 UNI GX 1.8LOAD 41 WRL1MEMBER LOAD1 UNI GX -3.13 5 8 UNI Y 12.44 6 7 UNI Y 8.12 UNI GX -6.8 8.8 112 UNI GX -6.8 6.6 8.82 UNI GX -6.8 4.4 6.62 UNI GX -6.8 2.2 4.42 UNI GX -6.8 0 2.2LOAD 42 WRL2MEMBER LOAD1 UNI GX -8.13 5 8 UNI Y 7.44 6 7 UNI Y 3.12 UNI GX -1.8 8.8 112 UNI GX -1.8 6.6 8.82 UNI GX -1.8 4.4 6.62 UNI GX -1.8 2.2 4.42 UNI GX -1.8 0 2.2*LOAD 61 EL*LOAD 62 ER* ******************** STRENGTH COMB* *******************LOAD COMB 101 DL+CG+LL11 1.0 12 1.0 21 1.0 LOAD COMB 102 DL+WLL111 1.0 31 1.0 LOAD COMB 103 DL+WLL211 1.0 32 1.0 LOAD COMB 104 DL+WRL111 1.0 41 1.0 LOAD COMB 105 DL+WRL211 1.0 42 1.0 * ******************** DEFLECTION COMB* *******************LOAD COMB 201 LL21 1.0 LOAD COMB 202 WLL131 0.7 LOAD COMB 203 WLL132 0.7 LOAD COMB 204 WLL141 0.7 LOAD COMB 205 WLL142 0.7 PERFORM ANALYSISDEFINE ENVELOPE101 TO 105 ENVELOPE 1 TYPE STRENGTH201 ENVELOPE 2 TYPE SERVICEABILITYEND DEFINE ENVELOPELOAD LIST ENV 2PARAMETER 1CODE AISC UNIFIED 2005METHOD ASDDFF 180 MEMB 3 TO 8DJ1 3 MEMB 4 6 7DJ2 5 MEMB 4 6 7DJ1 4 MEMB 3 5 8DJ2 5 MEMB 3 5 8TRACK 2 ALLCHECK CODE MEMB 3 TO 8**PARAMETER 2*CODE AISC UNIFIED 2005*METHOD ASD*FU 450000 MEMB 1 3 TO 8*FYLD 345000 MEMB 1 3 TO 8*BEAM 1 MEMB 1 3 TO 8*CB 0 MEMB 1 3 TO 8*STP 2 MEMB 1 3 TO 8*TRACK 2 ALL*LX 14.75 MEMB 3 TO 8*LY 3 MEMB 3 TO 8*LY 3 MEMB 1*LZ 14.75 MEMB 3 TO 8*LZ 16.5 MEMB 1***UNT 1.5 MEMB 3 TO 8*UNB 3 MEMB 3 TO 8*UNT 4.5 MEMB 1*UNB 4.5 MEMB 1***MAIN 200 MEMB 1 3 TO 8*DFF 1 ALL*LOAD LIST 101 TO 105*CHECK CODE ALLFINISH