trex select guardrail system - adobe by inspection, the lateral load, perpendicular to the plane of...

ProjecAutho

Anth

I hereor repthat I the st

ct number:or: TJB

ProjeCreation dLast revisRevision:

ony J Barn

eby certify thport was pream a duly Lates shown

7SM(F

ect namdate: 10/6/ion:

0

es, PE

hat the folloepared by mLicensed Pn on the foll

7008�NorthlSuite�150�Minneapolis(800)�337�53Fax:�(763)�53

e: Trex /17

owing pageme or underofessionallowing page

and�Drive�

s,�MN�55428339�|�(763)�533�2096�

Select G

es of this plar my direct l Engineer ues.

8�533�2094�

Guardra

an, specificsupervisiounder the la

ail Syste

cation,n and aws of

em

Page:�1 of�331

Anthony J Barnes PE

ProjecAutho

ct number:or: TJB

State�

Alabama

Arizona

California

Colorado

Florida

Georgia

Idaho

Indiana

Iowa

Louisiana

Maryland

Massachusetts

Michigan

Minnesota

Mississippi

Missouri

Nebraska

Nevada

New Jersey

New Mexico

New York

North Carolina

North Dakota

Ohio

Oklahoma

Pennsylvania

South Carolina

Tennessee

Texas

Utah

Virginia

Washington

Washington, DC

Wisconsin

Wyoming

7SM(F

Pr

a

a

C

7008�NorthlSuite�150�Minneapolis(800)�337�53Fax:�(763)�53

ofessional�Englicense�numb

34664

63922

84471

PE.0049211

77515

PE039214

P-17222

PE11400345

22527

39025

45817

51462

6201063081

51612

26806

PE2014023010

E-15134

023009

24GE0529130

24093

094109

041703

PE-9715

79131

27838

PE082756

33939

00117639

PE 117821

9163877-2202

402054114

51729

PE907658

43059-6

16000

and�Drive�

s,�MN�55428339�|�(763)�533�2096�

gineer�ber� aut

(w

0

0

2

8�533�2094�

Certificate�ofthorization�numwhere�applicab

CA-5026-E

24GA28272600

7271

5621

f�mber�ble)�

0

Page:�2 of�331

Project number: Author: TJB Page: 3 of 31

7008 Northland Drive Suite 150 Minneapolis, MN 55428 (800) 337-5339 | (763) 533-2094 Fax: (763) 533-2096

1 State certifications

12/31/1810/6/17

10/6/17EXP. 8/31/18

10/6/17EXP. 12/31/18

10/6/17EXP. 6/30/18

10/6/17EXP. 6/30/18

10/6/17EXP. 8/31/19

10/6/17EXP. 12/31/18

10/6/17EXP. 12/31/17

10/6/17EXP. 12/31/18

10/6/17EXP. 10/31/18

10/6/17EXP. 6/30/18

10/6/17EXP. 2/28/19

10/6/17EXP. 8/31/18



10/6/17EXP. 12/31/17

10/6/17EXP. 12/31/18

10/6/17EXP. 7/31/18

10/6/17EXP. 9/30/19

10/6/17EXP. 10/31/17

10/6/17EXP. 8/7/18

10/6/17EXP. 3/31/1910/6/17

EXP. 9/30/19

10/6/17EXP. 9/15/19

10/6/17EXP. 10/31/18

10/6/17EXP. 8/31/19

10/6/17EXP. 12/31/17



10/6/17

10/6/17EXP. 7/31/18

10/6/17EXP. 12/31/17 10/6/17

EXP. 12/31/17

10/6/17EXP. 9/30/18

10/6/17EXP. 4/30/18

10/6/17EXP. 12/31/1710/6/17

EXP. 6/30/18

10/6/17EXP. 12/31/17

10/6/17EXP. 12/31/17

10/6/17EXP. 6/30/20

10/6/17EXP. 9/30/18

Author: TJB Page: 6 of 30


Revision Description

Contents 1 State certifications .......................................................................................... 3

2 Description ..................................................................................................... 7

2.1 System details ......................................................................................... 8

2.1.1 Composite material data ................................................................... 8

2.1.2 Top and bottom rail ........................................................................... 9

2.1.3 Balusters ........................................................................................... 9

2.1.4 Posts ............................................................................................... 10

2.1.5 Aluminum insert .............................................................................. 11

2.1.6 Glass fiber reinforced bracket ......................................................... 13

2.1.7 General installation and assembly details ....................................... 13

3 Design criteria .............................................................................................. 14

3.1 Building codes/standards/project specifications ..................................... 14

3.2 Design loads .......................................................................................... 14

4 Calculations .................................................................................................. 14

4.1 Applied loads ......................................................................................... 14

4.2 Posts ...................................................................................................... 15

4.3 Top rail ................................................................................................... 17

4.4 Aluminum insert ..................................................................................... 18

5 Test results ................................................................................................... 23

5.1 Top rail flexural capacity ........................................................................ 23

5.2 Corner condition .................................................................................... 23

5.3 Overall assembly tests ........................................................................... 25

6 Conclusions .................................................................................................. 25

7 Appendix A – ESR report ............................................................................. 26



Description This calculation package illustrates the adequacy of the Trex Select railing system used in residential applications at post spacings of 96”. The railing system with this span uses an aluminum top rail stiffener and special glass fiber reinforced Nylon 6 bracket attached to the post.



1.1 System details

1.1.1 Composite material data



1.1.2 Top and bottom rail

1.1.3 Balusters



1.1.4 Posts

Posts also include a 4x4 treated wood member beneath this extruded composite cover. The wood and the composite sleeve capacities are calculated separately and checked versus the applied loads.



1.1.5 Aluminum insert

Insert inside of top rail:



1.1.6 Glass fiber reinforced bracket

1.1.7 General installation and assembly details *Reference ESR-3947 (Appendix A) – note that this report does not reflect the use of the aforementioned glass fiber reinforced bracket and aluminum top rail insert.



2 Design criteria

2.1 Building codes/standards/project specifications

1) IRC 2012 2) Aluminum Design Manual 2005 3) IBC 2012 4) ATI report no. C7507.01-119-19 dated 9/26/13 5) NDS 2012

2.2 Design loads Per table R301.5, a single 200 lb concentrated load shall be applied in any direction at any point along the top of the railing. Live load = 200 lbs applied laterally

Note: by inspection, the lateral load, perpendicular to the plane of the railing controls. *Per IBC chapter 17 requirements (section 1709.3.1), assemblies must be tested to 2.5 times the design load ( = 500 lbs)

3 Calculations

3.1 Applied loads Considering a 200 lb force applied at the center of the 8’ span:

M =PL

4=

0.2 k ∗ 96"

4= 4.8 k − in (7.68 k − in LRFD)

V =P

2=

0.2 k

2= 100 lbs

Considering a 500 lb force (IBC test load) applied at the center of the 8’ span:

M =PL

4=

0.5 k ∗ 96"

4= 12 k − in

V =P

2=

0.5 k

2= 250 lbs



Considering a 200 lb force at top of post: M = PL = 0.2 k ∗ 42" = 8.4 k − in (13.44 k − in LRFD)

V =P

2=

0.2 k

2= 100 lbs

3.2 Posts

S = 3.57 in3

M = 0.75 ∗ FuS = 0.75 ∗ 5500 psi ∗ 3.58 in3 = 14.7 k − in > moment caused by 200 lb load at top of post



Check 4x4 wood post (#2 SPF or better) S = 7.15 in3 Allowable stress per NDS 2012, Fb = 775 psi min. Bending capacity per 2012 NDS:

F𝑏′ = F𝑏CDCMCtCLCFCfuCiCr

All values = 1.0 except CD

CD = 1.6 (short term loading)

F𝑏′ = 775 psi ∗ 1.6 = 1240 psi

Mn = 1240 psi * 7.15 in3 = 8.9 k-in > applied



3.3 Top rail

S = 1.19 in3

M = 0.75 ∗ FuS = 0.75 ∗ 5500 psi ∗ 1.19 in3 = 4.9 k − in



3.4 Aluminum insert



Iy = 0.409 in4 c = 2.31”/2 = 1.16” S = 0.35 in3

Z = 0.44 in3 Neglect stiffener and assume member spans unsupported for 96”:



Capacity = 3.7 k-in very conservatively Total top rail capacity = composite section + insert = 4.9 k-in + 3.7 k-in = 8.6 k-in > moment caused by 200 lb load



4 Test results

4.1 Top rail flexural capacity Composite top rail WITHOUT aluminum insert. Data from ATI report:

Flexural capacity >applied due to 200 lb load; however, under 500 lb test load the capacity is exceeded; per section 3.4: Top rail test + insert = 9.2 k-in + 3.7 k-in = 12.9 k-in > moment caused by 500 lb load

4.2 Corner condition Axial load at bracket:

Sample ID: Axial Load - enhance bracket FA 160720-cs-1.mss Test Date: 7/20/2016

Method: 500# Rail Bracket Test at Post.msm Operator: RD



Sample Information:

Name Value

SampleID

TestName Axial Load - 160720-cs-1 Enhance

Bracket First Article

Specimen Results:

Specimen Peak Load

lbf

enhance bracket FA usa enhance rail 1 829.239



AVERAGE 899.25867

899 lbs > 500 lbs



4.3 Overall assembly tests 8’ complete railing section using parts described in section 1.1 Three samples were tested with two load conditions: 1) load at center (labeled 500# center pull) 2) load distributed laterally to two bracket (labeled as 1000# @ brackets)

all values exceed 500 lb test load assembly is adequate at 8’ span.

5 Conclusions The main components including top rail and post can be shown by calculation to adequately resist the 200 lb load prescribed by IRC 2012 at an 8’ span. Test results of the entire assembly and of individual components indicate the capacity of the railing assembly at an 8’ span is greater than the 500 lb load prescribed by IBC 2012 Chapter 17. Railing meet the requirements of IRC 2012.



6 Appendix A – ESR report

trex select guardrail system - adobe by inspection, the lateral load, perpendicular to the plane of...

Documents