moment end-plate beam to- column connections(CHECK LIST)

 failure modes for moment end-plate beam to-column connections are:
1. Flexural yielding of the end-plate material near the
tension flange bolts. This state in itself is not limiting,
but yielding results in rapid increases in tension
bolt forces and excessive rotation.
2. Shear yielding of the end-plate material. This limit
state is not usually observed, but shear in combination
with bending can result in reduced flexural capacity
and stiffness.
3. Bolt rupture because of direct load and prying force
effects. This limit state is obviously a brittle failure
mode and is the most critical limit state in an endplate
connection.
4. Failure of bolt, or slip of bolt in slip critical connections,
due to shear at the interface between the end
plate and column flange.
5. Plate bearing failure of end-plate or column flange
at bolts.
6. Rupture of beam tension flange to end-plate welds or
beam web tension region to end-plate welds.
7. Shear yielding of beam web to end-plate weld or of
beam web base metal.
8. Column web yielding opposite either the tension or
compression flanges of the connected beam.
9. Column web buckling opposite the compression flange
of the connected beam.
10. Column flange yielding in the vicinity of the tension
bolts. As with flexural yielding of the end plate, this
state in itself is not limiting but results in rapid
increases in tension bolt forces and excessive rotation.
11. Column web stiffener failure due to yielding, local
buckling or weld failure.
12. Column flange stiffener failure due to yielding or weld
failure.
13. Excessive rotation (flexibility) at the connection due
to end-plate and/or flange bending.
14. Column panel zone failure due to yielding or web plate
buckling.