Thursday, October 6, 2011

RE: Identify steel I-beam

X-Ray is much more accurate than GPR, but you have to understand how to interpret the shadow images of an X-Ray, which is different from the reflective image of photography.


D. Matthew Stuart, P.E., S.E., F.ASCE, SECB
Structural Division Manager

Pennoni Associates Inc.
One Drexel Plaza
3001 Market Street, 2nd Floor
Philadelphia, PA 19104
Office 215-222-3000 x7895 | Direct 215-254-7895
Fax 215-222-0789 | Mobile 908-309-8657 |


From: T. William (Bill) Allen, S.E. []
Sent: Thursday, October 06, 2011 11:59 AM
Subject: RE: Identify steel I-beam


I don't think X-Ray will get you close enough for engineering dimensions. It's difficult enough to distinguish between a #4 bar and #5 bar with X-Ray. Besides, X-Ray is a difficult technology to work with. You pretty much have to clear the area for quite some distance. Sonar is probably just as effective, but will also not give you dimensions.


I recommend you chip and repair.



T. William (Bill) Allen, S.E.


Consulting Structural Engineers

32302 Camino Capistrano, #206

San Juan Capistrano, CA 92675

V (949) 248-8588•F (949) 209-2509




From: h.d.richardson []
Sent: Thursday, October 06, 2011 8:38 AM
Subject: Re: Identify steel I-beam




        I believe you can take X-ray photographs of the column and measure the photograph.  Check with the people who do this sort of thing.




H. Daryl Richardson

----- Original Message -----

Sent: Thursday, October 06, 2011 9:24 AM

Subject: Identify steel I-beam


Fellow Engineers,
Is there a way to determine dimensions of an I-beam, encased in a square concrete column, to find its elastic properties, instead of chipping out the concrete?