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Re: Clip angle connection to concrete

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I guess eccentricity should be considered if its a
moment connection. Unless for a simple connection
where the edge of steel beam has a big clearance from
point of support thereby creating a substantial
eccentricity.

Alex C. Nacionales





--- "Sherman, William" <ShermanWC(--nospam--at)cdm.com> wrote:
> I sometimes encounter connections of metal
> components to concrete using
> metal angles attached to the concrete with
> drilled-in anchors. One example
> is connecting a steel beam to concrete using clip
> angles similar to a
> steel-to-steel connection. While steel-to-steel
> connections are typically
> designed for shear in the connection bolts, I
> usually design connections to
> concrete for the eccentrical loading due to the beam
> reaction at the
> centroid of bolts or welds used to connect the beam
> to the clip angles. This
> creates a prying force on the drilled-in anchor, so
> the top anchors into
> concrete are checked for combined tension and shear.
> 
> 
> But I've seen other engineers just design for shear
> in the anchor bolts
> similar to steel connection design. What is the
> basis for neglecting the
> eccentricity? For steel connections, I assume that
> the eccentricity is
> neglected based on test data and flexibility and
> ductility of the
> connection. However, the connection to concrete is
> more rigid and has not
> been tested like steel connections, so I feel that
> the eccentricity should
> be accounted for. Is there any basis for neglecting
> the eccentricity? 
> 
> Another case is when a grating bears on a seat angle
> anchored to the face of
> the concrete. Again I design for the eccentricity of
> the grating reaction on
> the seat angle. Does design for this case differ
> from the beam connection
> case?
> 
> 
> William C. Sherman, PE
> CDM, Denver, CO
> Phone: 303-298-1311
> Fax: 303-293-8236
> email: shermanwc(--nospam--at)cdm.com
> 
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