MMGS Drawings.pdf
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This document is a comprehensive technical specification and design guide for the Modified Midwest Guardrail System (MMGS), an FS30 P1-rated passive barrier system intended for military installations. The system provides a cost-effective alternative to standard guardrails while meeting ASTM F2656-15 FS30 P1 safety criteria and utilizing non-proprietary, readily-available hardware.
The MMGS represents a modification of the standard Midwest Guardrail System with three primary enhancements: replacement of single 10-gauge thrie beam with nested 12-gauge thrie beams (doubling the rail plies per segment) to resist splice bolt pullout and increase tensile capacity; substitution of standard-grade 5/8" diameter guardrail bolts with ASTM F3125 or A449 heavy hex head bolts, nuts, and F844 washers at all splices; and reduction of soil embedment depth from 51 inches to 45 inches. The system accommodates 14-foot-6-inch post spacing on 24-inch centers over a total length of approximately 177 feet, with impact testing occurring at the midspan between posts 15 and 16. Key components include 26 nested 12'-6" thrie beam sections (12-gauge per AASHTO M180), 4 thrie beam terminal connectors (10-gauge), reinforced concrete anchor blocks with epoxy-coated rebar (ASTM A615 Grade 60), welded steel anchor post assemblies, and 25 W6x9 steel posts with timber blockouts conforming to AASHTO M133. All structural steel receives ASTM A123 or A653 galvanizing treatment, with splice bolt holes drilled at 1¼ inches and galvanized to prevent corrosion. The design documentation includes detailed elevation, plan, and profile views; rebar specifications; post component drawings; hardware details; and a complete bill of materials with material and treatment specifications for all 25 bill line items.
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Modified Midwest Guardrail System (MMGS) FS30 P1 Passive Barrier System
02/22/2024
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 FS30 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.
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).
12/8/2017
DATE:
SHEET
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
Vehicle Impact
Anchor
DownstreamUpstream Anchor
Transportation Engineering Agency
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Guardrail System
Modified Midwest
UNITS:
in[mm]
Rating: FS30 P1
Post and Splice Details
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 f7
39 [991]
45 [1143]
38 [966]
SECTION A-A
e2 f5 e1
Ground
Line a1
Nested f5
DETAIL B
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Anchorage Overview
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
Upstream Concrete
Anchor Assembly
Post No. 3
See Note 1
Nested
C
27 [686]
38 [966]
PROFILE VIEW
f6
2-a2
Support Post
Assembly f4
Upstream Concrete
Anchor Assembly f8 f8
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
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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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Guardrail System
Modified Midwest
UNITS:
SHEET
Concrete Anchor Details
Upstream Anchor
Note: (1) Anchor is rotated 180 for downstream configuration.
=96 [2438]
@ 6"[152]
16 Spaces
102 [2591]
18 [457]
CLR
2 1/2 [63]
ELEVATION VIEW
b5 b4
78 [1981]
Ø36 [Ø914] b4 b5 b6 b1
54 [1372]
(TYP)
12 [305]
PROFILE VIEW
b6 b3 b2 b1 b4 b5
(TYP)
10 1/2 [266] 14 3/4 [375]
6 3/16 [157]
CLR (TYP)
2 [51]
(TYP)
5 [127]
CLR (TYP)
2 [51]
1 1/2 [38]
CLR
(TYP)
10 1/2 [266]
14 3/4 [375]
6 3/16 [157]
CLR (TYP)
2 [51]
PLAN VIEW
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Concrete Anchor Details
Downstream Anchor
ELEVATION VIEW
b5 b4
[1981]
[Ø914]
Ø36 b4 b5 b6 b1
PROFILE VIEW
b6 b3 b2 b1 b4 b5
(TYP)
10 1/2 [266] 14 3/4 [375]
6 3/16 [157]
CLR (TYP)
2 [51]
(TYP)
5 [127]
CLR (TYP)
2 [51]
1 1/2 [38]
CLR
(TYP)
10 1/2 [266]
14 3/4 [375]
6 3/16 [157]
CLR (TYP)
2 [51]
PLAN VIEW
CLR
2 1/2 [63]
18 [457]
=96 [2438]
@ 6"[152]
16 Spaces
102 [2591]
Note: (1) Anchor is rotated 180 for upstream configuration.
(TYP)
12 [305]
54 [1372]
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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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Anchor Post Assembly
55° 1 [25]
1 [25]
1/4 [6] c2 c1 c5
ELEVATION VIEW
Weep Hole on Front and Back Faces c4 c3
Weep Hole on Front and Back Faces
4 [102]
4 [102] 4 [102]
4 [102] c4 c3
PLAN VIEW
c1 c5 c2
[19]
3/4
[19]
3/4
[6]
1/4
[6]
1/4
PROFILE VIEW
c5 c2 c1
4 5/16 [110]
4 5/16 [110]
1/4 [6]
1/4 [6] E70xx
5/16 [8] E70xx
1/4 [6] E70xx
E70xx
1/4 [6]
5/16 [8] E70xx
E70xx
1/4 [6]
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Guardrail System
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UNITS:
SHEET
Anchor Post Components
14 [356] 9 1/2 [241]
3 [76]8 [203]
PLAN VIEW
11 1/2 [292]
5 1/2 [140]
PROFILE VIEW
14 [356]
ELEVATION VIEW
Part c3
12 [305]
3 [76]
5 [127]
2 1/4 [57]
7 1/2 [191]
5 [127]
(TYP)
Ø1 1/8 [Ø29]
PLAN VIEW
ELEVATION VIEW
Part c4
1/2 [13]
ELEVATION VIEW
Part c5
38 1/2 [978]
3 5/16 [84]
2 [51]
4 [102]
7 5/8 [194]
7 5/8 [194]
7 5/8 [194]
6 [152]
(TYP)
Ø1 [Ø25]
4 [102]
7 1/8 [181]
ELEVATION VIEW
Part c1
6 [152]
12 [305]
1/4 [6]
PLAN VIEW
55°
46 [1168]
35°
8 9/16 [218]
3 [76]
ELEVATION VIEW
Part c2
4 [102]
6 [152]
5/16 [8]
PLAN VIEW
2 1/4 [57]
(TYP)
[Ø29]
Ø1 1/8
1/2 [13]
1/2 [13]
16 [406]
33 1/4 [844]
4 3/16 [107]
Weep Hole
R5/16 [R8]
2 1/8 [53]
Weep Hole
R5/16 [R8]
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Guardrail System
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UNITS:
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Post Assembly
Anchor Support
60°
ELEVATION VIEW
d1 d3 d2 d4
Thru Weep Hole
6 [152]7 [178]
PLAN VIEW
d4 d3 d1 d2
PROFILE VIEW
d2 d1
1/4 [6]
1/4 [6]
1/4 [6]
1/4 [6]
7 [178] 1 15/16 [48]
1 15/16 [48]3 15/16 [99]
3 3/4 [94]
1/4 [6]
Transportation Engineering Agency
Distribution Command and
Military Surface Deployment
Guardrail System
Modified Midwest
UNITS:
SHEET
Support Post Components
Anchor
14 [356]
ELEVATION VIEW
Part d3
14 [356]
3 [76] 8 [203] 3 [76]
3 [76]
8 [203]
3 [76]
(TYP)
Ø1 1/8 [Ø29]
PLAN VIEW
12 [305]
ELEVATION VIEW
Part d4
11 [279]
2 [51] 8 [203] 2 [51]
3 [76]
5 [127]
3 [76]
(TYP)
Ø1 1/8 [Ø29]
PLAN VIEW
Weep Hole
R1/8 [R3]
ELEVATION VIEW
Part d1
7/8 [22]
PLAN VIEW
30°
34 11/16 [881]
60°
ELEVATION VIEW
D
D
SECTION D-D
11/16 [17]
PLAN VIEW
PROFILE VIEW
Part d2
20 5/8 [524]
Ø6 9/16 [Ø167]
[Ø114]
Ø4 1/2
1/2 [13]1/2 [13]
6 1/2 [165]
2 5/8 [66]
24 5/16 [617]
6 1/2 [165]
7 13/16 [198]
Ø6 9/16 [Ø167]
[965]
Transportation Engineering Agency
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Guardrail System
Modified Midwest
UNITS:
SHEET
Post Nos. 3 thru 26
Ø3/4 [Ø19]
7 1/8 [181]
3/4 [19]
ELEVATION VIEW
Part e1
3 15/16 [100]
PLAN VIEW
84 [2134]
PROFILE VIEW
6 [152]
1 3/4 [44]
7 1/8 [181]
Ø3/4 [Ø19]
ELEVATION VIEW
Part e2
SCALE 1:8
4 1/2 [114]
PLAN VIEW
22 [559]
8 [203]
PROFILE VIEW
5 7/8 [150] 3/8 [10]
3/4 [19]
Transportation Engineering Agency
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Military Surface Deployment
Guardrail System
Modified Midwest
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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.
(TYP)
37 1/2 [953] 43 3/4 [1111]
6 1/4 [159]
162 1/2 [4127]
ELEVATION VIEW
Part a1
F
8 1/2 [216] 2 [51]
6 1/4 [159]
DETAIL F
SCALE 1 : 16
12-gauge[2.7]
PROFILE VIEW
3 [76]
8 1/2 [216]
7 1/4 [184]
30 [762]
3 13/16 [97]
3 13/16 [97]
3 13/16 [97]
3 13/16 [97]
(TYP)
R1 [R25]
(TYP)
Ø1 [Ø25]
Ø3/4 [Ø19]
20 [507]
2 [51]
4 [102]
4 [102]
Ø3/4 [Ø19]
ELEVATION VIEW
Part a2
SCALE 1:12
E
E
10-gauge[3.4]
SECTION E-E
SCALE 1 : 12
(TYP)
37 1/2 [953]
87 1/2 [2223]
ELEVATION VIEW
Part a3
1/8 [2.7]
PROFILE VIEW
3/4 x 2 1/2
[19x64] Slot
3/4 x 2 1/2
[19x64] Slot
2 3/8 [60][19x64] Slot
(TYP)
(TYP)
[22x44] Slot
[32]
(TYP)
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Guardrail System
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Hardware
[254]
[102]
Part f5
[279]
Part f1
[25]
Part f2
[203]
[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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Guardrail System
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Bill of Materials
* Galvanize after welding
Item No.
QTY. Description Material Specification Treatment Specification Hardware
Guide a1 26 12'-6" [3,810] 12-gauge [2.7] Thrie Beam Section, Half Post Spacing
AASHTO M180 ASTM A123 or A653 a2 4 10-gauge [3.4] Thrie Beam Terminal Connector
AASHTO M180
Min. tensile strength = 70 ksi
[482.6 Mpa]
ASTM A123 or A653 RTE01b a3 2 6'-3" [1,905] 12-gauge [2.7] Thrie Beam Section, Half Post Spacing
AASHTO M180 ASTM A123 or A653 b1 2 78"x54"x18" [1,981x1,372x457] Reinforced Concrete 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
ASTM A500 Gr. B ASTM A123* 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
ASTM A53 Gr. B ASTM A123* 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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Bill of Materials
Item No.
QTY. Description Material Specification Treatment Specification Hardware
Guide f1 36 1" [25] Dia. UNC, 11" [279] Long Threaded Rod ASTM A449 or A354 Gr. BC or A193
Gr. B7 ASTM A153 or B633 or B695 Class 55 or
F1941 or F2329 FRR24b f2 36 1" [25] Dia. Heavy Hex Nut ASTM A563DH or A194 Gr. 2H ASTM A153 or B633 or B695 Class 55 or
F1941 or F2329 FNX24b f3 36 1" [25] Dia. Hardened Flat Washer ASTM F436 ASTM A153 or B695 Class 55 or F1136
Gr. 3 or F2329 FWC24b f4 14 7/8" [22] Dia., 8" [203] Long Heavy Hex Head Bolt
Bolt - ASTM F3125 Gr. A325 Type 1 Nut - ASTM A563DH
ASTM A153 or B695 Class 55 or F1136 Gr. 3 or F2329 or F2833 Gr. 1
FBX22b f5 25 5/8" [16] Dia. UNC, 10" [254] Long Guardrail Bolt and Nut
Bolt - ASTM A307 Gr. A Nut - ASTM A563A
ASTM A153 or B695 Class 55 or F2329 FBB03 f6 180 5/8" [16] Dia. UNC, 1 3/4" [44] Long Heavy Hex Bolt and Nut
Bolt - ASTM F3125 Gr. A325 Type 1 Nut - ASTM A563DH
ASTM A153 or B695 Class 55 or F1136 Gr. 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 F436 ASTM A153 or B695 Class 55 or F1136
Gr. 3 or F2329 FWC22b
Epoxy Adhesive Min. Bond Strength = 1,305 psi [9.0
MPa]
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