Bridge suggestion needed

[Joepomp]

Side # 2

Here is side #2 this is a 70' through plate girder bridge.
I usde Modle RR Bridges & Trestles as a referance. I drew the parts in Auto Cad to full scale then printed then at 1/87 for HO.
I am starting on the flooring next.

 

[Joepomp]

Missing pic?


Ill try to attach the PIc again!

 

[Ray Marinaccio]

Nice job Joe.
I like your bridge and the method used to build it.

 

[cidchase]

Hi ss,
I believe that Ray has the right idea for making a "curved bridge"
You must use a straight section wide enough to support the curved track. If using multiple curved sections joined at an angle, my understanding is that you must support each joint with a pier, bent, or buttress. See Gary Pfeil's pix for example. Otherwise the curvature and weight cause a twisting force or moment to be applied to the abutment attachments. This contributes to a loss of structural integrity, possibly resulting in the well-known LUDIR syndrome.*

Of course, if you don't expect a visit from the Proto Police, just build it however u think looks good (and holds up your heaviest loco)!!

*locomotive upside down in ravine

 

[MasonJar]

Originally posted by cidchase
LUDIR syndrome.*


*locomotive upside down in ravine

No coincidence that it rhymes with "oh dear"?! That's another entry for the "Gaugespeak" dictionary I think!

Andrew

 

[screwysquirrel]

Originally posted by cidchase
Hi ss,
I believe that Ray has the right idea for making a "curved bridge"
You must use a straight section wide enough to support the curved track. If using multiple curved sections joined at an angle, my understanding is that you must support each joint with a pier, bent, or buttress. See Gary Pfeil's pix for example. Otherwise the curvature and weight cause a twisting force or moment to be applied to the abutment attachments. This contributes to a loss of structural integrity, possibly resulting in the well-known LUDIR syndrome.*

Of course, if you don't expect a visit from the Proto Police, just build it however u think looks good (and holds up your heaviest loco)!!

*locomotive upside down in ravine

Well, my curved bridge is just 1 'segment' long with both ends already supported, the 'bridge' needs to be for show only.

 

[Joepomp]

The bridge with new camera

Santa came early. Here is a better picture of the bridge I built from carboard and Plastruct angles.

 

[Joepomp]

Again!

Ill try again.ops:

 

[Chris333]

Here's one I built. It curves around a 9.5" radius and up a 2.5% grade. More pics here:

http://www.railimages.com/gallery/chrisschmuck

 

[jimmybeersa]

Proto Practice

Here is how the CP handled the problem Thats my Grandson and I on the curve

 

[jimmybeersa]

Another shot

 

[jimmybeersa]

From below