Dear
I modeled a 2-D steel frame, and considered the leaning column for P-Delta effects.
I have two questions:
1) Is total weight of each story considered as the load of the leaning column in each story?
2) What is combination load considered as the load of the leaning column in each story?
Best Regards;
P-Delta effects and the leaning column
Moderators: silvia, selimgunay, Moderators
Re: P-Delta effects and the leaning column
1) if this is the only lateral resisting frame then yes, otherwise the load is the portion of the load this frame is responsible for.
2) ?? don' understand your question, could you rephrase it.
2) ?? don' understand your question, could you rephrase it.
Re: P-Delta effects and the leaning column
Dear Dr Fmk
Thanks for your reply.
Is (Dead load + Live load) considered as the load of the leaning column in each story ? or other combination of Dead load and Live load?
Thanks for your reply.
Is (Dead load + Live load) considered as the load of the leaning column in each story ? or other combination of Dead load and Live load?
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amir70007
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Re: P-Delta effects and the leaning column
HI...
Do I need to define leaning column for P-Delta effects in my model If I use "PDelta Transformation" for "Geometric Transformation Command" ?
Do I need to define leaning column for P-Delta effects in my model If I use "PDelta Transformation" for "Geometric Transformation Command" ?
Re: P-Delta effects and the leaning column
Leaning column is usually included in the model to capture the effect of gravity columns on the response of the lateral frame. For the leaning column to work properly you need to assign "PDelta" geometric transformation to it.
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amir70007
- Posts: 58
- Joined: Sat Sep 20, 2008 11:13 pm
- Location: Tehran-Amir Kabir University of Technology (Tehran Polytechnic)
- Contact:
Re: P-Delta effects and the leaning column
Thank you...
1-According to your reply if the 3D model has no gravity column I do not need to define leaning column.
2-Suppose the model has 6 frame and the external frames are MRF and internal frames are gravity columns.
Is it correct that in a 2D model I assign gravity load of MRF frame to its own MR frame and assign gravity load of 2 other internal frames to the leaning column?
3-Do I need to assign "PDelta Transformation" to MRF columns too?
4-How can I calculate moment of inertia and area of a leaning column?
1-According to your reply if the 3D model has no gravity column I do not need to define leaning column.
2-Suppose the model has 6 frame and the external frames are MRF and internal frames are gravity columns.
Is it correct that in a 2D model I assign gravity load of MRF frame to its own MR frame and assign gravity load of 2 other internal frames to the leaning column?
3-Do I need to assign "PDelta Transformation" to MRF columns too?
4-How can I calculate moment of inertia and area of a leaning column?
Re: P-Delta effects and the leaning column
1. Yes.
2. Yes.
3. Yes.
4. You can find it here: Gupta, A., and Krawinkler, H. (1999). "Seismic Demands for Performance Evaluation of Steel Moment Resisting Frame Structures," Technical Report 132, The John A. Blume Earthquake Engineering Research Center, Department of Civil Engineering, Stanford University, Stanford, CA. [electronic version: https://blume.stanford.edu/tech_reports]
2. Yes.
3. Yes.
4. You can find it here: Gupta, A., and Krawinkler, H. (1999). "Seismic Demands for Performance Evaluation of Steel Moment Resisting Frame Structures," Technical Report 132, The John A. Blume Earthquake Engineering Research Center, Department of Civil Engineering, Stanford University, Stanford, CA. [electronic version: https://blume.stanford.edu/tech_reports]