Importance of the Beam "End Length Offsets"

[serrojo]

Hello,

I am subscribed to this forum since 2010 and mostly was looking for answers.

Today I have learned a lesson from the details in the model:

I have spent the whole last week analyzing 45 meter high RC building model that had an issue with some of the beams (later I found out that the trouble was at circular columns joints):
The RC design, no matter how great section was defined, always displayed the #45 error.
I knew it was a modelling mistake, but still I couldn´t sleep well Until today I started to compare between the design results and found that the Shear was Huge near the circular columns (more than 7000 kN).
Later I turned on the extruded view and found that there was an overlap between the beam and the column.

With the right-click menu either selecting and assign>Frame>End Length Offsets the user can change the default "Auto" Option and set manually the value equal to the half of the column width.

After that the design turn out normal for the Beams.

So my recommendation to all: check the "End Length Offsets" for beams on circular columns.

Best regards,



MSc. Eng. Serguei Joa
Tel: +5352460358
mail: sm.joa@bouygues.cu

 

[JasonMcKee71]

Ys you are right, but what about the ridigity factor? Many suggest using just 1 (rigid body) instead of 0 (continuous rigidity like the beam framing into the joint).

Jason McKee
proud R&D Manager of
Cross Section Analysis & Design
Software for the structural design of cross sections
Moment Curvature Analysis
Interaction Diagrams
Reifnorcement Design etc.

 

[MartinDZO1]

Thank you so much for this info.

 

[JasonMcKee71]

You are most welcome.

Jason McKee
proud R&D Manager of
Cross Section Analysis & Design
Software for the structural design of cross sections
Moment Curvature Analysis
Interaction Diagrams
Reifnorcement Design etc.