Inverted Pendulum on Shear Walls

[Vlcostello]

I am working on a pedestrian bridge that is 30'-0" above grade. It is supported on three single "columns" that closely resemble concrete shear walls. They are the width of the bridge (12'-0") and +/-2'-0" thick. I think that it is an inverted pendulum structure based on the definition in ASCE 7. However, when selecting coefficients for seismic design, my options are limited to the three types of concrete moment frames. Any thoughts on what values I should be using?

 

[msquared48]

It's obviously a bridge pier, and I would design them as a shear walls for the seismic and wind loading transverse to the span, ordinary if possible.

Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[phdunn]

Find an AASHTO Spec for bridges. They do this all the time.

 

[bridget13]

VI Costello: How did you end up designing the walls for lateral loads (design for longitudinal seismic forces and fpr tansverse seismic forces)?.