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Structural Information Related to Interna-Rail® Aluminum Railing

Interna-Rail Aluminum Pipe Railing

INTERNA-RAIL®:
Interna-Rail is uniquely designed for easy assembly and superior strength. The all-mechanical assembly requires no welding.
TEE CONNECTIONS:
Interna-Rail’s tee connections feature a threaded, tubular rivet that provides a more substantial thread engagement between the bolt and post.
SPLICE CONNECTIONS:
Splice connections make use of a set screw that tightens through the pipe wall and component to spread the fitting tangs. The combined strength of the screw, connecting the fitting to the pipe, and the expansion of the tangs, firmly secures the fitting to the pipe.
FITTINGS:
Interna-Rail fittings are cast of corrosion-resistant, aluminum/ magnesium alloy. When combined with stainless steel connectors, this system is an excellent choice for any industrial or architectural application in virtually any environment or climate.
FINISH:
Interna-Rail’s smooth, continuous surface gives any railing application an attractive, streamlined appearance. The standard finish on all Interna-Rail fittings is clear anodized. Other architectural finishes, as well as in-fill panels are also available. Contact Wagner for more information about these and other options available to you.
HARDWARE:
Unlike other railing systems, every Interna-Rail assembly comes complete with all of the necessary hardware. This is true whether you specify vertical posts or pre-fabricated systems. Specify Interna-Rail to suit your application.
FABRICATION:
To assist you in selecting the best method of assembly for your application, Wagner can supply you with a list of qualified fabricators in your area or supply fabricated, pre-finished railings per your specifications. Contact Wagner with your requirements.
INTERNA-RAIL TEST DATA
Based on 1-1/2″ Schedule 40 Aluminum Pipe The Pittsburgh Testing Laboratory conducted tests on the Interna-Rail System. The results far exceed OSHA side load requirements as well as a wide range of regional and local regulations. The tests were performed on 12″ high handrail assemblies and 42″ high single posts. While all of the tests used 1-1/2″ IPS schedule 40 aluminum pipe, the alloy temper, type of mounting and reinforcement were varied. Test results are detailed on the chart below.
Rail Assembly
Single Post
Alloy 6063-T6
No Reinforcement
Base Flange
Alloy 6061-T6
No Reinforcement
Wall Flange
Alloy 6061-T6
20″ Reinforcement
Wall Flange
Alloy 6061-T6
12″ Reinforcement
Wall Flange
Load
Deflection
Permanent Set
Deflection
Permanent Set
Deflection
Permanent Set
Deflection
Permanent Set
200
.84″
.00″
.56″
.00″
.81″
.00″
1.22″
.00″
250
1.47″
.00″
.91″
.00″
1.31″
.00″
1.53″
.00″
300
2.31″
.00″
1.28″
.00″
1.81″
.00″
1.90″
.00″
350
2.72″
.00″
1.62″
.00″
2.34″
.00″
2.40″
.00″
400
3.31″
.00″
2.00″
.00″
3.82″
.00″
2.84″
.00″
450
4.09″
.09″
2.47″
.00″
4.07″
.53″
3.34″
.00″
500
3.03″
.00″
4.26″
.16″
550
3.40″
.00″
600
3.84″
.00″
650
4.31″
.00″
700
4.88″
.25″

These results exceed OSHA side load requirements. Test results show that, when fabricated and installed properly, Interna-Rail exceeds OSHA side load requirements listed in OSHA General Industry Standards, 29 CFR 1910.23, Chapter XVII, paragraph (5) (iv) for pipe railings, revised publication date November 7, 1978, as follows:

The mounting of handrails shall be such that the completed structure is capable of withstanding a load of at least 200 pounds applied in any direction, at any point on the top rail.

RAILING FORMULAS
The following railing formulas may be used to determine maximum post spacing under a uniform load and stress at the base of the post under a concentrated load. Consult your local code to determine your structural requirements.

Uniform Load:

L = (f s x S)/(w/12 x h )

Concentrated Load

f = (F x h)/S

  • L = Span between centerline of posts (inches)
  • f = Unit Stress (psi)
  • fs = Allowable Stress (psi)
  • S = Section Modulus (in3)
  • w = Uniform Load (lb/ft)
  • F = Concentrated Load (lb)
  • h = Post Height (inches)

Result will provide you with the stress at the base of the post. Compare to Allowable Stress for the aluminum alloy to determine it’s suitability.

Allowable Stress
(psi)
Minimum Yields
(psi)
Modulus of Elasticity
(psi x 106)
6061-T6 pipe
24,000
35,000
10.0
6063-T6 pipe
18,000
25,000
10.0
Pipe Size
Schedule
Outside Diameter
Inside Diameter
Wall
Section Modulus
1-1/2″
40
1.900″
1.610″
.145″
.326 in2
1-1/2″
80
1.900″
1.500″
.200″
.412 in2
Load Distribution:
In pipe railing load distribution is fairly uniform. On railings having two or fewer spans, multiply the concentrated load (F) by .85 for end posts and .65 for intermediate posts. On railings having three or more spans, multiply the concentrated load (F) by .84 for end posts and .60 for intermediate posts.

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