erection tolerance

By Neil Munshi Date 09-21-2002 21:25

The erction and fabrication tolerences for welded elements for the bridge structure is 1/8" for a 10 ft length as per AWS D1.5.

However how this can be applied to aseries of elments say 25 ft in lenths joined in the field to form a total element. The case in point is a steel arch 450ft long erected in 10 pieces. what kind of tolerences can be acceptable/

By CHGuilford (****)

Date 09-23-2002 11:02

I believe you will find the 1/8" per 10' applies to camber and sweep. Overall length is a different story, the steel has to hit it's support points. With 450' span, I would hope there was some adjustment somewhere. I'd say whatever your total tolerance from each of the bearing points, divided by the number of elements in the span, would be your tolerance on the overall length of each element.
CHGuilford

By G.S.Crisi (****)

Date 09-26-2002 01:50

You`ll find a great deal of material on the `Code of Standard Practice of Steel Buildings and Bridges`, published by the American Institute of Steel Construction, which you can download for free at www.aisc.org
Giovanni S. Crisi
Sao Paulo - Brazil