Modified Midwest Guardrail System (MMGS) REV 1 · 2020. 11. 17. · AASHTO M147-65 Grading B Strong Soil 29 Vehicle Impact Anchor Upstream Anchor Downstream Transportation Engineering

Modified Midwest Guardrail System (MMGS) – REV 1 M30 P1 Passive Barrier System

This guardrail system is intended to provide a cost-effective means for establishing passive barriers on military installations. The MMGS design is based on five primary principles:

Give consideration to occupant safety.

Meet ASTM F2656-15 M30 P1 criteria.

Exist as a non-proprietary design that is not owned or patented.

Utilize “standard hardware” which is defined as readily-available, off-the-shelf, and/or prefabricated structural sections.

Reduce costs for DOD installations. Based on a 1.0 area cost adjustment factor, system

costs are estimated at $15,700 for two anchor sections plus $61 per linear foot for the guardrail run.

The MMGS is based off the Midwest Guardrail System design, with the following modifications:

Replaces the 10-gauge thrie beam with nested 12-gauge thrie beam (i.e., 2x rails per rail segment). The increased number of plies of rail will resist splice bolt pullout, increase total cross-sectional area of the rail (and thus rail tensile capacity at splices and non-splices), and reduce bearing failure at splices. NOTE: At rail splices, maintain rail nesting such that two outer plies overlap both two inner plies. At post locations, bolt through both plies of rail. At the end anchorages, place both plies of thrie beam between the outer and inner thrie end connectors.

Substitutes the standard-grade, 5/8” diameter guardrail bolts at splices for ASTM F3125 or A449, 5/8” diameter, heavy hex head bolts and nuts and ASTM F844 washers on both sides of the rail.

Reduces the soil embedment depth by 6 inches to 45 inches.

General Guidance

Blockouts shall utilize southern yellow pine timber that conforms to AASHTO M133.

Guardrail dimensional tolerances shall be consistent with state department of transportation general practices, references and guidelines.

Thrie beam splice bolt locations should be drilled with 1 ¼” holes for ease of assembly and an application of galvanized coating shall be administered to prevent corrosion (the field tested MMGS splice holes were drilled in this manner).

This guardrail system was approved on 01 May 2018 by the USACE - Protective Design Center for use as a passive barrier on DOD installations. SDDCTEA requests that installations email construction costs for the MMGS as projects get awarded. EMAIL: [email protected]

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System Layout Overview

180 DEGREES.

OF THE COMPONENTS BEING ROTATED

DESIGNS ARE IDENTICAL WITH THE EXCEPTION

ARE FOR REFERENCING ONLY. THE ANCHOR

THE TERMS UPSTREAM AND DOWNSTREAM

Note: (1) The impact location is the vehicle centerline impacting at the midspan

between post nos. 15 and 16.

(2) Impact tolerance is +/- 1 ft [305] of nominal location.

(3) Simple splicing used according to normal traffic conventions; no sandwiching

within system. At thrie terminal connection splices, the nested thrie beam was

sandwiched between terminal connectors.

96638"

a1

Nested

a1

Nested

a1

Nested

a1

Nested

a1

Nested

a1

Nested

a1

Nested

a1

Nested

a1

Nested

a1

Nested

a1

Nested

a1

Nested

a1

Nested

442014’-6"

3048120"

442014’-6"

129551"

a3

Nested

ELEVATION VIEW

2-a22-a2

AASHTO M147-65 Grading B Strong Soil

A

A

90°

(TYP)

190575"

95337 1/2"

18296’-0"

61024"

335311’-0"

61024"

54115177’-6 1/2"

52591172’-6 1/2"

PLAN VIEW

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

AASHTO M147-65 Grading B Strong Soil

29

Vehicle Impact

Anchor

DownstreamUpstream Anchor

Transportation Engineering Agency

Distribution Command

and

Military Surface Deployment

Guardrail System

Modified Midwest

UNITS:

in[mm]

Rating: M30 P1

12/8/2017

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Post and Splice Details

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SHEET

75 [1905]

Ground

Line

SPLICE DETAIL

BACKSIDE

Post No. 16 Post No. 15

Note: (1) Guardrail bolts (part f5) on the upstream side of the

web.

(2) A drift pin may be used to attach nested rails. If

galvanization is damaged, galvanizing spray may be used

to ensure proper rust protection.

(3) Washers (part f7) used on front and back of splice

bolts.

B

f6

39 [991]

45 [1143]

38 [966]

SECTION A-A

e2

f5

e1

Ground

Line

a1

Nested

DETAIL B

f7

f5



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Anchorage Overview

ARE FOR REFERENCING ONLY (SEE SHEET 1).

THE TERMS UPSTREAM AND DOWNSTREAM

COMPONENTS BEING ROTATED 180 DEGREES.

DESIGN WITH THE EXCEPTION OF THE

DOWNSTREAM ANCHOR IS THE SAME

ANCHOR AS THE EXAMPLE. THE

THIS DRAWING SHOWS THE UPSTREAM

Notes: (1) Two thrie terminal connectors (part a2) needed per end anchorage.

(2) A drift pin may be used to attach nested rails. If galvanization is

damaged, galvanizing spray may be used to ensure proper rust protection.

37 1/2 [953] 76 1/4 [1937]

6 [152]

Ground

Line

ELEVATION VIEW

Anchor Post

Assembly Support Post

Assembly

2-a2

a1

f4

Post No. 3

See Note 1

Nested

C

27 [686]

38 [966]

PROFILE VIEW

f6

2-a2

Support Post

Assembly

f4

f8

f8

Concrete Anchor Assembly

Concrete Anchor Assembly



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Modified Midwest

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Rating: M30 P1

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Detail C

Anchor Attachment Note: (1) Threaded rods (Part f1) anchored to concrete anchorage using

Powers Fasteners AC100+ Gold epoxy or an equivalent epoxy with a

minimum bond strength of 1,305 psi [9.0 MPa].

8 [203] 8 [203]

5 [127] 5 [127]

16 [407] 8 [203] 7 3/4 [197]

9 [229]

DETAIL C

f1

f2

f3

20 1/4 [514]



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Concrete Anchor Details

Upstream Anchor

=96 [2438]

@ 6"[152]

16 Spaces

14 3/4 [375]

6 3/16 [157]

102 [2591]

18 [457]

ELEVATION VIEW

b5

b4

14 3/4 [375]

6 3/16 [157]

78 [1981]

Ø36 [Ø914]

PLAN VIEW

b4

b5

b6

b1

(TYP)

12 [305]

54 [1372]

PROFILE VIEW

b6

b3

b2

b1

b4

b5

(TYP)

CLR

2 [51]

10 1/2 [266]

(TYP)

1 1/2 [38]

CLR

CLR (TYP)

2 [51]

5 [127]

(TYP)

CLR

2 [51]

(TYP)

10 1/2 [266]

CLR (TYP)

2 [51]

2 1/2 [64]

CLR

Note: (1) Anchor is rotated 180 for downstream configuration.



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Concrete Anchor Details

Downstream Anchor

CLR (TYP)

2 [51]

14 3/4 [375]

6 3/16 [157]

=96 [2438]

@ 6"[152]

16 Spaces

102 [2591]

18 [457]

ELEVATION VIEW

b5

b4

78 [1981]

14 3/4 [375]

6 3/16 [157]

Ø36 [Ø914]

PLAN VIEW

b4

b5b6

b1

54 [1372]

(TYP)

12 [305]

PROFILE VIEW

b6

b3

b2

b1

b4

b5

2 [51]

CLR

(TYP)

10 1/2 [266]

(TYP)

2 [51]

CLR (TYP)

5 [127]

(TYP)

1 1/2 [38]

CLR

10 1/2 [266]

(TYP)

2 1/2 [64]

CLR

Note: (1) Anchor is rotated 180 for upstream configuration.



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Rebar Details

Concrete Anchor

Bill of Bars

ITEM NO. QTY BAR SIZE UNBENT LENGTH MATERIAL SPEC

b3 32 #8 [25] 114" [2,896] ASTM A615 Gr. 60

b4 16 #5 [16] 140 3/4" [3,575] ASTM A615 Gr. 60

b5 24 #5 [16] 74" [1,880] ASTM A615 Gr. 60

b6 34 #4 [13] 122" [3,099] ASTM A615 Gr. 60

LAP

18"[457]

Ø32 [Ø813]

Bar b6

114 [2896]

Bar b3

(TYP)

Ø2 1/2 [Ø64]

50 [1270]

14 [356]

LAP

18 [457]

Bar b4

74 [1880]

Bar b5



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Modified Midwest

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Anchor Post Assembly

55°1 [25]

1 [25]

1/4 [6]

c2

c1

c5

ELEVATION VIEW

Weep Hole on Front

and Back Faces

c4c3

Weep Hole on Front

and Back Faces

1/4"[6]E70xx

5/16"[8]E70xx

1/4"E70xx

4 [102]

4 [102]4 [102]

4 [102]

c4

c3

PLAN VIEW

c1

c5

c2

1/4"[6]E70xx

5/16"[8]E70xx

1/4"E70xx

3/4 [19]

3/4 [19]

1/4 [6]1/4 [6]

PROFILE VIEW

c5

c2

c1

4 5/16 [110]

4 5/16 [110]

1/4 [6]



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Modified Midwest

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Anchor Post Components

[356]

14

[241]

9 1/2

[76]

3

[203]

8

(TYP)

[Ø29]

Ø1 1/8

PLAN VIEW

[292]

11 1/2

[140]

5 1/2

PROFILE VIEW

[356]

14

ELEVATION VIEW

Part c3

[305]

12

[76]

3 [127]

5

[57]

2 1/4

[191]

7 1/2

[127]

5

(TYP)

[Ø29]

Ø1 1/8

PLAN VIEW

[406]

16

ELEVATION VIEW

Part c4

[13]

1/2

ELEVATION VIEW

Part c5

[978]

38 1/2

[84]

3 5/16

[51]

2 [102]

4

[194]

7 5/8

[194]

7 5/8 [194]

7 5/8

[152]

6

(TYP)

[Ø25]

Ø1

[102]

4

[181]

7 1/8

ELEVATION VIEW

Part c1

[152]

6

[305]

12

[6]

1/4

PLAN VIEW

55°

[1168]

46

35°

[218]

8 9/16

[76]

3

ELEVATION VIEW

Part c2

[102]

4

[152]

6

[8]

5/16

PLAN VIEW

Weep Hole

R5/16

33 1/4 [844]

4 3/16 [107]

2 1/8 [53]

Weep Hole

R5/16 [8]

1/2 [13]1/2 [13]

2 1/4 [57]



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Modified Midwest

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Rating: M30 P1

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Post Assembly

Anchor Support

60°

ELEVATION VIEW

d1

d3

d2

d4

Thru Weep Hole

[152]

6

[178]

7

[178]

7

PLAN VIEW

d4

d3

d1d2

PROFILE VIEW

d2

d11/4 [6]

1 7/8 [48]

1/4 [6]

3 3/4 [94]

3 7/8 [99] 1 7/8 [48]

1/4 [6]

1/4 [6]

1/4 [6]



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Modified Midwest

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Rating: M30 P1

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Support Post Components

Anchor

[356]

14

ELEVATION VIEW

Part d3

[356]

14

[76]

3

[203]

8

[76]

3

[76]

3

[203]

8

[76]

3

PLAN VIEW

[305]

12

ELEVATION VIEW

Part d4

[279]

11

[51]

2

[203]

8

[51]

2

[76]

3

[127]

5

[76]

3

(TYP)

[Ø29]

Ø1 1/8

PLAN VIEW

Weep Hole

[R3]

R1/8

[965]

38

ELEVATION VIEW

Part d1

[22]

7/8

PLAN VIEW

30°

[881]

34 11/16

60°

ELEVATION VIEW

D

D

SECTION D-D

[Ø114]

Ø4 1/2

[17]

11/16

PLAN VIEW

PROFILE VIEW

Part d2

Ø6 9/16 [167]

20 5/8 [524]

Ø6 9/16 [167]

(TYP)

Ø1 1/8 [29]

1/2 [13]1/2 [13]

6 1/2 [165]7 13/16 [198]

6 1/2 [165]

24 5/16 [617]

2 5/8 [66]



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Modified Midwest

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Rating: M30 P1

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Post Nos. 3 thru 26

[181]

7 1/8

[19]

3/4

ELEVATION VIEWPart e1

[100]

3 15/16

PLAN VIEW

[2134]

84

PROFILE VIEW

[152]

6

[44]

1 3/4

[181]

7 1/8

ELEVATION VIEW

Part e2

SCALE 1:8

[114]

4 1/2

[19]

3/4

PLAN VIEW

[559]

22

[203]

8

PROFILE VIEW

Ø3/4 [19]

5 7/8 [150]

Ø3/4 [19]

3/8 [10]



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Guardrail System

Modified Midwest

UNITS:

in[mm]

Rating: M30 P1

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Rail Details

Note: (1) A drift pin may be used to attach nested rails. If galvanization is damaged,

galvanizing spray may be used to ensure propper rust protection.

[1111]

43 3/4

[159]

6 1/4

ELEVATION VIEW

Part a1

F

[216]

8 1/2

[51]

2

[159]

6 1/4

DETAIL F

SCALE 1 : 16

PROFILE VIEW

[76]

3

[216]

8 1/2

[762]

30

(TYP)

[R25]

R1

[507]

20

[51]

2

[102]

4

[102]

4

ELEVATION VIEW

Part a2

SCALE 1:12

E

E

10-gauge[3.4]

SECTION E-E

SCALE 1 : 12

(TYP)

[952]

37 1/2 [2223]

87 1/2

ELEVATION VIEW

Part a3 PROFILE VIEW

162 1/2 [4128]

[19x64] Slot (TYP)

2 3/8 [60]

3 13/16 [97]

3 13/16 [97]

3 13/16 [97]

3 13/16 [97]

Ø3/4 [19]

(TYP)

[19x64] Slot

7 1/4 [184]

[19]

Ø3/4

(TYP)

[22x44] Slot

(TYP)

Ø1 [25]

(TYP)

3/4 x2 1/2

[19x64] Slot

12-gauge[2.7]

(TYP)

37 1/2 [953]

12-gauge[2.7]



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Modified Midwest

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Rating: M30 P1

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Hardware

[254]

10

[102]

4

Part f5

[279]

11

Part f1

[25]

1

Part f2

[203]

8

[57]

2 1/4

Part f4

Part f3

Part f8

[3]

1/8

[44]

1 3/4

[32]

1 1/4

Part f6

Part f7

5/8-11 UNC

1-8 UNC

7/8-9 UNC

5/8-11 UNC

5/8 [16]

1/8 [3]Ø1 3/4 [44]

Ø11/16 [17]

Ø1 3/4 [44]

Ø15/16 [24]

9/16 [14]

7/8 [22]

3/16 [4]Ø2 [51]

Ø1 1/16 [27]



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Modified Midwest

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Rating: M30 P1

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Bill of Materials

* Galvanize after welding

ItemNo.

QTY. Description Material Specification Treatment SpecificationHardware

Guide

a1 26 12’-6" [3,810] 12-gauge [2.7] Thrie BeamSection, Half Post Spacing

AASHTO M180 ASTM A123 or A653-

a2 4 10-gauge [3.4] Thrie Beam Terminal Connector

AASHTO M180Min. tensile strength = 70 ksi

[482.6 Mpa]

ASTM A123 or A653 RTE01b

a3 2 6’-3" [1,905] 12-gauge [2.7] Thrie BeamSection, Half Post Spacing

AASHTO M180 ASTM A123 or A653-

b1 2 78"x54"x18" [1,981x1,372x457] ReinforcedConcrete Anchor Block Min. f’c = 4,000 psi [27.6 MPa]

- -

b2 2 36" [914] Dia. Concrete Anchor, 102" [2,591]Long Min. f’c = 4,000 psi [27.6 MPa]

- -

b3 32 #8 [25] Straight Rebar, 114" [2,896] Long ASTM A615 Gr. 60 Epoxy Coated (ASTM A775 or A934)-

b4 16 #5 [16] Anchorage Stirrup, 140 3/4" [3,575]Long Unbent

ASTM A615 Gr. 60 Epoxy Coated (ASTM A775 or A934)-

b5 24 #5 [16] Straight Rebar, 74" [1,880] Long ASTM A615 Gr. 60 Epoxy Coated (ASTM A775 or A934)-

b6 34 #4 [13] Anchor Hoop Rebar with 32" [813] Dia.,122" [3,099] Long Unbent

ASTM A615 Gr. 60 Epoxy Coated (ASTM A775 or A934)-

c1 2 HSS 6"x12"x1/4" [152x305x6] Tube, 38 1/2"[978] Long

ASTM A500 Gr. B ASTM A123*-

c2 2 HSS 6"x4"x5/16" [152x102x8] Tube, 46" [1,168]Long


c3 2 14"x14"x1/2" [356x356x13] Steel Plate ASTM A36 or A572 Gr. 50 ASTM A123*-

c4 2 16"x12"x1/2" [406x305x13] Steel Plate ASTM A36 or A572 Gr. 50 ASTM A123*-

c5 2 11 1/2"x5 1/2"x1/2" [292x140x13] Steel Plate ASTM A36 or A572 Gr. 50 ASTM A123*-

d1 2 Pipe 6 [152] xx-Stong Pipe, 38" [965] Long ASTM A53 Gr. B ASTM A123*-

d2 2 Pipe 4 [102] xx-Stong Pipe, 34 11/16" [881]Long


d3 2 14"x14"x1/2" [356x356x13] Steel Plate ASTM A36 or A572 Gr. 50 ASTM A123*-

d4 2 12"x11"x1/2" [305x279x13] Steel Plate ASTM A36 or A572 Gr. 50 ASTM A123*-

e1 25 W6x9 [W152x13.4], 84" [2,134] Long Steel Post ASTM A992 ASTM A123-

e2 25 6"x8"x22" [152x203x559] Timber Blockout SYP Grade No. 1 or better- -



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Modified Midwest

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Rating: M30 P1

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Bill of Materials

ItemNo.

QTY. Description Material Specification Treatment SpecificationHardware

Guide

f1 36 1" [25] Dia. UNC, 11" [279] Long Threaded RodASTM A449 or A354 Gr. BC or A193

Gr. B7ASTM A153 or B633 or B695 Class 55 or

F1941 or F2329FRR24b

f2 36 1" [25] Dia. Heavy Hex Nut ASTM A563DH or A194 Gr. 2HASTM A153 or B633 or B695 Class 55 or

F1941 or F2329FNX24b

f3 36 1" [25] Dia. Hardened Flat Washer ASTM F436ASTM A153 or B695 Class 55 or F1136

Gr. 3 or F2329FWC24b

f4 14 7/8" [22] Dia., 8" [203] Long Heavy Hex HeadBolt

Bolt - ASTM F3125 Gr. A325 Type 1Nut - ASTM A563DH

ASTM A153 or B695 Class 55 or F1136Gr. 3 or F2329 or F2833 Gr. 1

FBX22b

f5 25 5/8" [16] Dia. UNC, 10" [254] Long GuardrailBolt and Nut

Bolt - ASTM A307 Gr. ANut - ASTM A563A

ASTM A153 or B695 Class 55 or F2329 FBB03

f6 180 5/8" [16] Dia. UNC, 1 3/4" [44] Long HeavyHex Bolt and Nut

Bolt - ASTM F3125 Gr. A325 Type 1Nut - ASTM A563DH

ASTM A153 or B695 Class 55 or F1136Gr. 3 or F2329 or F2833 Gr. 1

FBX16b

f7 360 5/8" [16] Dia. Plain Round Washer ASTM F844 ASTM A123 or A153 or F2329 FWC16a

f8 14 7/8" [22] Dia. Hardened Flat Washer ASTM F436ASTM A153 or B695 Class 55 or F1136

Gr. 3 or F2329FWC22b

- -Epoxy Adhesive Min. Bond Strength = 1,305 psi [9.0

MPa]

- -



and


Guardrail System

Modified Midwest

UNITS:

in[mm]

Rating: M30 P1

SDDCTEA Modified MGS M30 P1 Sheet 1SDDCTEA Modified MGS M30 P1 Sheet 2SDDCTEA Modified MGS M30 P1 Sheet 3SDDCTEA Modified MGS M30 P1 Sheet 4SDDCTEA Modified MGS M30 P1 Sheet 5SDDCTEA Modified MGS M30 P1 Sheet 6SDDCTEA Modified MGS M30 P1 Sheet 7SDDCTEA Modified MGS M30 P1 Sheet 8SDDCTEA Modified MGS M30 P1 Sheet 9SDDCTEA Modified MGS M30 P1 Sheet 10SDDCTEA Modified MGS M30 P1 Sheet 11SDDCTEA Modified MGS M30 P1 Sheet 12SDDCTEA Modified MGS M30 P1 Sheet 13SDDCTEA Modified MGS M30 P1 Sheet 14SDDCTEA Modified MGS M30 P1 Sheet 15SDDCTEA Modified MGS M30 P1 Sheet 16

Documents

Modified Midwest Guardrail System (MMGS) REV 1 · 2020. 11. 17. · AASHTO M147-65 Grading B Strong Soil 29 Vehicle Impact Anchor Upstream Anchor Downstream Transportation Engineering