Hi All
Here in Denmark Seismic loading is merely defined as a percentage of the applied vertical load. In the past i've used NOTIONAL LOADS to create this and it worked fine. But only for Y axis as global vertical axis. I now use SET Z UP since it corresponds to the axis definitions all our clients use.
However, notional loads doesn't seem to Work properly when the command SET Z UP command is used. Can anyone explain this?
The alternative is to manually copy all vertical loads and change direction in the STAAD.Editor. But this is a very time consuming task and it also rather frustrating since loads tend to change a lot during the design phase.
Can anyone help me to explain this or alternatively give me a tip to avoid the manual re-entry of loads? Perhaps someone has created a macro for a similar task?
Thank You.
Kind regards
Morten
Hi Seth
Thank you for your reply. Unfortunaly most of the vertical load the needs to be applied isn't selfweight from the structure but DL from equipment and so forth. I've made a small example in STAAD for a simple structure, but i'm not sure how to upload it? For the time being i will paste the command lines from STAAD.Editor:
I've set the notional load to 0.015 times the vertical load. In the example STAAD should convert the 400 kN to 6 kN horizontally in case 2. It works fine in the Y-case, but in the Z-case no horizontal load is applied in case 2.
Y UP
STAAD SPACESTART JOB INFORMATIONENGINEER DATE 16-Oct-14END JOB INFORMATIONINPUT WIDTH 79UNIT METER KNJOINT COORDINATES1 0 0 0; 2 5 0 0; 3 0 5 0; 4 5 5 0; 5 0 0 5; 6 5 0 5; 7 0 5 5; 8 5 5 5;MEMBER INCIDENCES1 3 4; 2 1 3; 3 2 4; 4 7 8; 5 5 7; 6 6 8; 7 3 7; 8 4 8;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 EUROPEAN1 TO 8 TABLE ST 140x8SHSCONSTANTSMATERIAL STEEL ALLSUPPORTS1 2 5 6 FIXEDLOAD 1 LOADTYPE Dead TITLE DLJOINT LOAD3 4 7 8 FY -100LOAD 2 LOADTYPE Seismic TITLE NOTIONALNOTIONAL LOAD1 X 0.015 PERFORM ANALYSISFINISH
Z UP
STAAD SPACESET Z UPSTART JOB INFORMATIONENGINEER DATE 16-Oct-14END JOB INFORMATIONINPUT WIDTH 79UNIT METER KNJOINT COORDINATES1 0 0 0; 2 5 0 0; 3 0 0 5; 4 5 0 5; 5 0 -5 0;6 5 -5 0; 7 0 -5 5; 8 5 -5 5;MEMBER INCIDENCES1 3 4; 2 1 3; 3 2 4; 4 7 8; 5 5 7; 6 6 8; 7 3 7; 8 4 8;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 EUROPEAN1 TO 8 TABLE ST 140X8SHSCONSTANTSMATERIAL STEEL ALLSUPPORTS1 2 5 6 FIXEDLOAD 1 LOADTYPE Dead TITLE DLJOINT LOAD3 4 7 8 FZ -100LOAD 2 LOADTYPE Seismic TITLE NOTIONALNOTIONAL LOAD1 X 0.015 PERFORM ANALYSISFINISH
I hope You can help
Answer Verified By: MortenHK