Analysis - Frames - Analysis methods of frames

6 important questions on Analysis - Frames - Analysis methods of frames

When may the amplified sway method be used?

for buildings with one storey alpha critical larger is as 3
And for buildings with two or more storey's provided alpha critical is larger as 3 and have a similar distribution of
  • Vertical loads
  • Horizontal loads
  • Frame stiffness with respect to the applied storey shear forces
  

What is the sway buckling length method?

Having carried out a first-order analysis, the global stability of the frame and the local stability of the members are then assessed by code checking using the design rules for equivalent members. Buckling lengths relevant to the sway instability mode are used.

Which method is analysis is always allowed?

An elastic global analysis
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When is a plastic global analysis allowed?

If the structure has sufficent rotation capacity at the locations where plastic hinges will occur, whether this is the members of the joints.

What are the three methods that force distribution can be determined with?

A first order analysis method
A second-order analysis method where the effect of local initial bow imperfections on instability behaviour is not explicitly taken in to account
The amplified sway method

How is the buckling length defined for the three cases of the force distribution?

The buckling lengths for the non-sway instability mode

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