Bases with Moments

[Parrapit]

Hi, Guys

I just want to confirm something. If a Base has a moment on it from a steel post and the post is imbedded into the concrete that would make it fixed, now is it a must to have steel (re-bar) in the concrete base because of the moment or is it right to make the base a certain depth for example 500 deep for a 1m x 1m base. Using the 45 degree pressure line.

 

[JAE]

Hmmm...a sketch posted here might help. Not sure where the base plate is with respect to the concrete base.

 

[Parrapit]

Ok let me change the scenario. The base is 650mm deep and the base plate is 150mm from the surface. So imbedded 150mm into the concrete base. The base remains 1m x 1m.

 

[amec2004]

The followings are the references for design of embedded steel as fix moment connection

PCI Design Handbook Precast and Prestressed Concrete 6th Ed Section 6.9
PCI Engineering Journal Precast Concrete Connections With Embedded Steel Members
ACI Journal Strength of Embedded Steel Sections as Brackets
ASCE Guidelines for Design of Joints between Steel Beams and Reinforced Concrete Columns

The moment capacity depends on the concrete bearing. The additional welded reinforcement will increase the capacity. See attached PDF file.


anchor bolt design per ACI 318-11 crane beam design

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