Steel shear strength of anchors with stand-off base plates : [technical summary].
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2013-09-01
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Abstract:Sign and signal structures are often connected
to concrete foundations through an annular base
plate set on anchor bolts. The plate is leveled
with nuts beneath it and secured with nuts
above it — a “double-nut” connection. In many
installations, the anchoring bolts are exposed
between the concrete base and the leveling nuts,
increasing shear stress
on the anchor bolts,
potentially to failure.
Adding grout pads offers
more protection against
shear stress, but the
extent of protection is
unclear. Also, current
standards allow torsional
forces to be ignored for
certain configurations of
the connective structure
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