Alternative Support Systems for Cantilever - National Transportation ...
Alternative Support Systems for Cantilever - National Transportation ...
Alternative Support Systems for Cantilever - National Transportation ...
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6.2.5 Cast-in-Place Solid Concrete Pedestal with Bolted Slip Base Connection<br />
In this option, a cast-in-place solid concrete pedestal would be poured projecting from the<br />
foundation with the tapered steel monopole placed over the pedestal projection and the two<br />
connected with bolts. Some longitudinal rebar would connect the solid concrete pedestal<br />
projection to the foundation. See Figure 6-6 <strong>for</strong> the setup of this connection.<br />
Figure 6-6. Cast-in-Place solid concrete pedestal with slip base connection<br />
As with the previous option, one benefit to this connection would be that the annular base<br />
plate and anchor bolt connection would be eliminated. Another benefit to this connection is that<br />
the construction would be relatively easy because it’s all cast-in-place. One problem with this<br />
connection is that the connection may have less flexural strength because the rebar would be the<br />
only flexural rein<strong>for</strong>cement. And as with the other bolted slip connections, the bolt bearing may<br />
require an increase in monopole member thickness.<br />
following:<br />
Bolt<br />
Longitudinal<br />
rebar<br />
Design strength considerations <strong>for</strong> this connection include, but are not limited to, the<br />
• Bolt shear strength<br />
• Bolt bearing strength (on steel monopole)<br />
• Bolt bearing strength (on cast-in-place solid concrete pedestal)<br />
• Fatigue (of bolts)<br />
85<br />
Tapered steel<br />
monopole<br />
“sleeve”<br />
Concrete<br />
foundation<br />
Cast-in-Place<br />
solid concrete<br />
pedestal