×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

ASTM A513 Guardrails

ASTM A513 Guardrails

ASTM A513 Guardrails

(OP)
Hi everyone,

I've been given a steel shop drawing for guardrails to check.  I noticed the steel fab is using 1-1/2" diameter ASTM A513 grade tubes.  I looked in my steel manual and could not find this grade of steel.  A quick google search for the yield strength gives a range of 30-80 ksi.  Anyone use this grade before and know what the yield strength is?  I'm trying to see if it would be acceptable to resist handrail loads.

Thanks,

RE: ASTM A513 Guardrails

I have never ask why, but I think there must be reasons that AISC specify certain metals as structural grade material, and left out rest majority of metal products. Find out.

RE: ASTM A513 Guardrails

SEG...check with the fabricator.  That tubing is available, as noted in a variety of yield strengths.  The fabricators I deal with use a 50 ksi yield material (pretty much the only way you can get a 1-1/2 inch tube to handle the lateral loads).  Anything over a 4-foot spacing gets close.

Ask them to submit mill certificates or at least a purchase order for your documentation, showing the 50 ksi material.

RE: ASTM A513 Guardrails

What do your plans & specs call for or is the design left to the discretion (or imagination) of the contractor?

NYSDOT specs generally require 50 ksi for tubes used as part of a guide rail systems.

RE: ASTM A513 Guardrails

Is yield the only concern in specifying, selecting structural material? Or there are something else need to be concerned with (other than cost)?

Range of Yield Strength of a few Metals:

Aluminum - 40 to 70 ksi
Bronze - 25 to 100 ksi
Copper - 8 to 110 ksi
Nickel - 20 to 90 ksi
Steel - 30 to 100 ksi
Steel Wire - 40 to 150 ksi  

RE: ASTM A513 Guardrails

A web search turns out a discussion record below.

"ASTM 513 has a Type 1 or 2...the Fy & Fu depend on the alloy (C1010 or C1020), the tube OD & the wall thickness

the following material properties ranges apply

for 1010

Fu - 45 ksi to 48 ksi
Fy - 35 ksi to 40 ksi

for 1020

Fu - 55 ksi to 50 ksi
Fy - 36 ksi to 40 ksi

tubes .75" OD & smaller have the higher strengths & lower elongations (~15%)

.75" OD & larger with heavier walls have the lower strengths & higher elongations (~25%to 35%)

[color red]I'd use 29,000 ksi for E[/red] ???????

hope this helps
Robert Kazanjy"





 

RE: ASTM A513 Guardrails

Looks like it (A513) lies in between A36 & A572, comparatively speaking. For certainty, check it out directly from ASTM.

RE: ASTM A513 Guardrails

Also, is this for transportation project? If so, check AASHTO for spec. on guardrails.

RE: ASTM A513 Guardrails

Are you sure you are not only checking the connection to the concrete or something like that?  Usually DOT projects have certain guardrails they want to use but I never check the actual guardrails, I just check for example the bridge supporting the guardrails.   

Never, but never question engineer's judgement

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

White Paper – Data Security and Know-How Protection
Our data is constantly exposed to the danger of being intercepted or stolen as it wends its way over global data networks. Data security measures and measures for protecting intellectual property should not, however, first be implemented when data is exchanged – companies must lay the foundation for these measures within their own organization. Download Now
White Paper – Collaboration in the PLM Context
The influence exerted by the Internet of Things (IoT) means that there is a steadily growing need for collaboration in industry. Partners from new industries and areas of application need to be integrated in cross-company business processes to ensure that the lifecycle of smart, connected products can be managed from end to end. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close