×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Why line load in local coordinate system has only two components?

Why line load in local coordinate system has only two components?

Why line load in local coordinate system has only two components?

(OP)
Hi
I want to assign line load on beam element in Abaqus.
In Abaqus dialog window Line load has three components in global CS but only two in local CS.
The qwestion is, where is third component and how to assign it?
Thanks in advance

RE: Why line load in local coordinate system has only two components?

The option "Local" refers to the beam orientation, not to a user defined CSYS.


The Users Manual say:
"Use the following option to define a force per unit length in the beam local 1- or 2-direction: ..."

So the missing direction is the one in the direction of the beam itself. How should a outer load in reality act within the beam?
That's why "Local" has only two components.

RE: Why line load in local coordinate system has only two components?

(OP)
Like gravity force for example.Any vector in 3d has 3 components.How to put ice load on vertical beam for example?

RE: Why line load in local coordinate system has only two components?

Use the Global option. Gravity is not interested in the beam local orientation. Btw. Gravity is a load type of it's own.
Why do you want an outer force to act exactly within the beam? What would be the equivalent in reality?

RE: Why line load in local coordinate system has only two components?

(OP)
In reality I want to put wind and ice loads on my frame.I will use global option of course,because there is no other way.In calculations I need not only behavior of some beam,but behavior of whole system,so I need to put all forces.I hope you understand me,excume for my english

RE: Why line load in local coordinate system has only two components?

Maybe I've misunderstood your post. When you would like to apply the global load in a user defined CSYS, then your question would be valid. This functionality seems to be not available. The user has to recalculate his load in the global directions.

What can be done to help with that recalculation? Define a dummy point load in that local CSYS. Then activate the option for the job that prints out additional model data in the .dat. Do a rightclick at the job in the tree and then Edit. In that menu use the General tab to find that option. After a datacheck you'll find the transformation components in the .dat.

RE: Why line load in local coordinate system has only two components?

(OP)
Ok,now when we understood each other my question is still:
where is third component of line load in beam coordinate system?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources