Share your Staad Knowlegde

[zbizafar]

Engr 1900,

Yes i am confuse , please explain more.

Everyone,

Please share command you use in Staad editor besides given in manual. any tricks up your sleeves. I am a basic user, but would like to know more from u people.

Regards,

[engr1900]

Hy
In case of reverse cylindrical coordinates in staadpro
u need to define something like this
joi coo cyln rev
1 1 0 0 22 1 4 270
here 1 = first node
1 = radius
0 = height
0= angle
when u come to node 22
1 = radius
4 = height
270 = angle
in general..... node radius height angle (1 1 0 0)
similar way increase the height and angle, u will get helix

hope it helps
byeeeee

[engr1900]

MESH IN STAADPRO
Its very easy to define a mesh in a model in staadpro, if your model is very big and complicated, just note down the node numbers where u want to add mesh and use the following method(suppose ur node numbers r like this, 200,201 202 203
*****************
define mesh
A JOINT 200
B JOINT 201
C JOINT 202
D JOINT 203
GENERATE ELEMENTS
MESH ABCD 4 4
*****************
AND YOU ARE DONE

byeeee

[engr1900]

JOINT LOAD IN CASE OF SEISMIC ANALYSIS IN STAADPRO
Provide all beam and column junctions as hinged and create a load case [i.e. DL+50%LL or 25%LL as per Code]
Then run analysis and view the result w.r.t the already created load case.
Go to reaction tab and copy the reactions to the excel sheet
Delete the all the unwanted columns [ Fx, Fz, Mx, My…]
Let nodes, loadcase and Fy column retained
Replace the loadcase column fully by Joint weight
Copy and paste it in the staad editor
Done…

[zbizafar]

Dear All ,

I keep getting this warning

**WARNING - THERE WERE MORE THAN 12 DOF WITH ZERO STIFFNESS.
THE FIRST 12 ARE LISTED ABOVE.
TOTAL # TRANSLATIONAL= 93 TOTAL # ROTATIONAL= 279

***WARNING - INSTABILITY AT JOINT 87 DIRECTION = FX
PROBABLE CAUSE SINGULAR-ADDING WEAK SPRING
K-MATRIX DIAG= 6.6122954E+02 L-MATRIX DIAG= -1.7053026E-13 EQN NO 367
***NOTE - VERY WEAK SPRING ADDED FOR STABILITY


And the displacements are off the chart. Can anyone help me with this. I am attaching a small part , rename it to .std please.

Thanks and regards,

[sarapatuse]

Dear zbizafar
the problem in your model is that you assigned "truss" to almost everything.
I fixed that (see atachment)
Be carefull using the truss command

regards

[syedmuzaffer]

hi friends can someone explain the steel design parameters in staad design to bs5950

[adshrt]

Dear Freinds

How to insert dynamic loads in staad, I am doing a TG Foundation design (essentially a frame over which turbine generator is placed) where in i am having the only the weight and rpm of the turbine generator.

Kindly enlighten me on how to input the loads and analyze in staad

i am attaching the dynamic calculations which i have done

Code:

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regards
anup

[engr1900]

HY
Plz go thru this which explains about dynamic loading in Sttadpro
hope it will help u in carrying out dynamic analysis in Staad

There are 2 issues to consider in the use of STAAD for dynamic analysis - how STAAD
idealises the distribution of mass and how to apply the forcing function.
STAAD distributes the mass via the SELFWEIGHT command. When this is done, the
mass is lumped at the nodes. If this is an inadequate model of the mass idealisation, the
member concentrated load command CON can be used to tell STAAD that significant
masses are located there and their values. Also, the user can split the member into shorter
lengths by inserting nodes along the member. In this case, the user can use the JOINT
LOAD command to tell STAAD that a significant mass is located there and its mass.
The SELFWEIGHT command is placed as the first line (or lines) of the commands under
the relevant LOAD command. If the CON or JOINT LOAD commands are used, it is
placed after the SELFWEIGHT command.
To apply a forcing function in STAAD at the nodes, or at a particular location, you must
first define the type of forcing function using the DEFINE TIME HISTORY command.
Note that a forcing function can only be applied at a node so if the user wishes to apply
the function to a point along a member, a node must be placed there first.
You then use the TYPE “i” FORCE command along with its particular syntax
requirements. Finally, under the relevant LOAD command and after the mass
idealisation commands (i.e. SELFWEIGHT, CON, JOINT LOAD), you use the TIME
LOAD command. You can only use the TIME LOAD command in one load case.

[rvkumar361]

hi,
I am learning STAAD Pro, how to design a RCC Slab (both one & two way) in staad pro. Any one have Staad model regarding slab. please upload for me

thanks in advance