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Curved Steel Frame

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Speaking only of curved structures subjected to lateral loads in general, the 
structure will behave more as a shell than it will behave as a conventionally 
framed structure.  A curved retaining wall will not behave as a cantilever 
until it cracks due to circumferential stresses.  Similarly, a curved 
building subject to lateral forces acting *towards* its concave side will 
subject the horizontal circumferential beams to tension and lateral forces 
acting *towards* the convex side will subject those same beams to 
compression.  The radial "frames" will not behave as frames until the 
horizontal circumferential beams (or their connections) fail.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona

. > Ed Gonzalez wrote:
. > 
. > Greetings:
. > 
. > Can anyone share their general thoughs or comments, for the design of a 
. > two story, three-bay CURVED ordinary steel frame for lateral seismic 
. > loads in a Zone 4 region.  SAC 95-01, FEMA 267 and FEMA 267a. will be 
. > adhered to as much as possible.  The columns are not equally spaced.
. > 
. > We plan to orient the columns with the strong axis along the curve, and 
. > have the beams fabricated so as to follow the curve contour as much as
. > possible. The max. eccentricities are 18", 10" and  6".  Shear studs will 
. > be placed along the top beam flange.  
. > 
. > Of particular concern is the best way to model the frame while accounting 
. > for the potential torsional demand on the beams and connections. Modeling 
. > of the deck is being considered. We want to start using an elastic 
. > program (RISA3D) and then gravitate into using an inelastic software as 
. > deemed needed.
. > 
. > 
. > Regards,
. > ed gonzalez
. >