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Frame & Wall Design Procedures

Frame & Wall Design Procedures

Frame & Wall Design Procedures

(OP)
After a number of years working on bridge-type structures, I'm looking at a low-rise building for one of our newer projects.  As such, I have a few questions regarding moment frame and shear wall design:

1) When working with a moment frame, is there a "better" method of determining lateral stiffness than modeling the frame with a unit force and correlating that to deflection?  Is there standard equations to use (like with shear walls) that calculate the deflections quickly and easily?

2) I read in an outdated text that concrete moment frames must be poured monolithically.  Obviously this is ideal but I can already hear the contractors complaining.  Unless the rebar was insufficiently developed or the friction of the joint was too weak in shear, I don't see any reason for this.  Any comments?

3) For moment frames with shallow footings, is it common to connect the footings with a strap rather than isolating each footing?

4) If a shear wall (or frame) is angled 45 degrees from the principal lateral load direction, how does it contribute to the stiffness of the system? (cos45? Neglected?)

Thanks!
 

RE: Frame & Wall Design Procedures

#3:  I  commonly do that to prevent the footings from spreading for one.  Also, to lower the soil pressures due to overturning - pick up the dead resisting load of both columns.

#4:  I commonly use the 45 degree component length of the wall in the line of the applied force, but there are other methods.

Mike McCann
MMC Engineering
Motto:  KISS
Motivation:  Don't ask

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