751.8 Concrete Box Culverts - Revision history

Hoskir: /* 751.8.2.6.3 Other Design Requirements */ updated old math code

2026-01-15T19:58:46Z

751.8.2.6.3 Other Design Requirements: updated old math code

← Older revision		Revision as of 14:58, 15 January 2026
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	{\| style="margin: 1em auto 1em auto" width="800"		{\| style="margin: 1em auto 1em auto" width="800"
	\|-		\|-
	\|align="left"\|<math>\~~mbox~~{ Percentage} = \frac{100}{\sqrt{S}} \le 50%</math>\|\|align="right"\|Equation 751.8.2.6.50		\|align="left"\|<math>\text{Percentage} = \frac{100}{\sqrt{S}} \le 50%</math>\|\|align="right"\|Equation 751.8.2.6.50
	\|}		\|}

Hoskir: updated old math code

2026-01-15T19:52:45Z

updated old math code

← Older revision		Revision as of 14:52, 15 January 2026
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	Unit weight of reinforced concrete,		Unit weight of reinforced concrete,
	::::::<math>\~~boldsymbol~~{\gamma}_c</math> = 150 lb/ft<sup>3</sup>		::::::<math>\mathbf{\gamma}_c</math> = 150 lb/ft<sup>3</sup>

	Continuous concrete slab,		Continuous concrete slab,
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	Unit weight of earth fill,		Unit weight of earth fill,
	::::::<math>\~~boldsymbol~~{\gamma}_e</math> = 120 lb/ft<sup>3</sup>		::::::<math>\mathbf{\gamma}_e</math> = 120 lb/ft<sup>3</sup>

	===751.8.1.2 Standard Box Culverts===		===751.8.1.2 Standard Box Culverts===
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	: ''η<sub>i</sub>'' = Load modifier		: ''η<sub>i</sub>'' = Load modifier

	:<math>\~~boldsymbol~~{\gamma}_i</math> = Load factor		:<math>\mathbf{\gamma}_i</math> = Load factor

	:''Φ'' = Resistance factor		:''Φ'' = Resistance factor
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	::H = design height of wing wall (ft.), (Figure 751.8.2.5.2)		::H = design height of wing wall (ft.), (Figure 751.8.2.5.2)

	::<math>\~~boldsymbol~~{\gamma}_s</math> = effective unit weight of backfill (kcf)		::<math>\mathbf{\gamma}_s</math> = effective unit weight of backfill (kcf)

	::''θ'' = angle of fill face of wall to the horizontal (deg.)		::''θ'' = angle of fill face of wall to the horizontal (deg.)
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	{\| style="margin: 1em auto 1em auto" width="800"		{\| style="margin: 1em auto 1em auto" width="800"
	\|-		\|-
	\|align="left"\|<math>P_h = A \~~boldsymbol~~{\gamma}_s K_a H_i</math> \|\|align="right"\|Equation 751.8.2.4.7		\|align="left"\|<math>P_h = A \mathbf{\gamma}_s K_a H_i</math> \|\|align="right"\|Equation 751.8.2.4.7
	\|}		\|}

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	:''s'' = average spacing of tensile steel reinforcement		:''s'' = average spacing of tensile steel reinforcement

	:<math>\~~boldsymbol~~{\gamma}_e</math> = 1.0. (0.75 recommended for top slabs used as a riding surface)		:<math>\mathbf{\gamma}_e</math> = 1.0. (0.75 recommended for top slabs used as a riding surface)

	:''d<sub>c</sub>'' = thickness of concrete cover for tensile reinforcement (in.)		:''d<sub>c</sub>'' = thickness of concrete cover for tensile reinforcement (in.)

Hoskir: /* 751.8.3.2 Steel Reinforcement */ updated per RR4028

2025-04-11T20:39:32Z

751.8.3.2 Steel Reinforcement: updated per RR4028

← Older revision		Revision as of 15:39, 11 April 2025
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	===751.8.3.2 Steel Reinforcement===		===751.8.3.2 Steel Reinforcement===

	'''Barrel Section '''		'''Barrel Section '''

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	[[image:751.8.3.2.1 over 2015.jpg\|center\|700px]]		[[image:751.8.3.2.1 over 2015.jpg\|center\|700px]]


	<center>'''Figure 751.8.3.2.1 Typical Cross-Section of Standard Box Culvert Showing Bar Marks'''</center>		<center>'''Figure 751.8.3.2.1 Typical Cross-Section of Standard Box Culvert Showing Bar Marks'''</center>

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	~~[[image~~:751.8.3.2.~~4b.jpg\|center~~\|~~500px]]~~		<gallery heights=376 mode="packed">
			File:751.8.3.2_04b.png\|'''(b)'''
			</gallery>

	[[image:751.8.3.2.4c.jpg\|center\|275px]]		[[image:751.8.3.2.4c.jpg\|center\|275px]]

Hoskir: Hoskir moved page 751.8 LRFD Concrete Box Culverts to 751.8 Concrete Box Culverts: renamed per RR3868

2024-07-19T18:43:43Z

Hoskir moved page 751.8 LRFD Concrete Box Culverts to 751.8 Concrete Box Culverts: renamed per RR3868

← Older revision	Revision as of 13:43, 19 July 2024
(No difference)

Hoskir: /* 751.8.3.5 Miscellaneous */ updated per RR3848

2024-05-09T18:54:47Z

751.8.3.5 Miscellaneous: updated per RR3848

← Older revision		Revision as of 13:54, 9 May 2024
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	A transverse joint is not required when extending the barrel not more than 15 feet. When extensions exceed 15 feet, transverse joint requirements are the same as those for full culverts, see [[#751.8.3.1 Joints\|EPG 751.8.3.1]].		A transverse joint is not required when extending the barrel not more than 15 feet. When extensions exceed 15 feet, transverse joint requirements are the same as those for full culverts, see [[#751.8.3.1 Joints\|EPG 751.8.3.1]].

			'''Guardrail Attachments'''
			When guardrail attachments are required for new culverts they shall be in accordance with [[751.12_Barriers,_Railings,_Curbs_and_Fences#751.12.6_Culvert_Guardrail_.28Top_Mounted.29\|EPG 751.12.6 Culvert Guardrail (Top Mounted)]]. When attaching guardrail to an existing culvert follow the guidance outlined in [[751.1_Preliminary_Design#751.1.3.4_Barrier_or_Railing_Type.2C_Height_and_Guidelines_for_Curb_Blockouts\|EPG 751.1.3.4 Barrier or Railing Type,Height and Guidelines for Curb Blockouts]].

Hoskir: updated 2 images - Elevation of exterior and interior wings

2022-10-06T19:45:51Z

updated 2 images - Elevation of exterior and interior wings

← Older revision		Revision as of 14:45, 6 October 2022
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	''E1 bar –'' Provide 4- #5 bars and they should extend into wing walls as far as practical as shown in Figure 751.8.3.2.3. For wing walls on rock, these bars shall be extended 12” into the rock and grouted.		''E1 bar –'' Provide 4- #5 bars and they should extend into wing walls as far as practical as shown in Figure 751.8.3.2.3. For wing walls on rock, these bars shall be extended 12” into the rock and grouted.

	[[image:751.8.3~~.2.3 2015~~.jpg\|center\|750px]]		[[image:751-8-3-2_WallReinf-Ext_10-22.jpg\|center\|750px]]
			<center><big>'''(a) ELEVATION OF EXTERIOR WING'''</big></center>


	[[image:751.8.3~~.2.3a 2015~~.jpg\|center\|775px]]		[[image:751-8-3-2_WallReinf-Int_10-22.jpg\|center\|775px]]
			<center><big>'''(b) ELEVATION OF INTERIOR WING'''</big></center>

Smithk: Per BR, updated broken links

2022-01-11T15:22:25Z

Per BR, updated broken links

← Older revision		Revision as of 10:22, 11 January 2022
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	'''Spacing Limit of Steel Reinforcement'''		'''Spacing Limit of Steel Reinforcement'''

	See [[751.5 Standard Details#751.5.~~10 Reinforcing Steel Detailing~~\|EPG 751.5.10]].		See [[751.5 Standard Details#751.5.9.2.5 Spacing Limits\|EPG 751.5.9.2.5 Spacing Limits]].

	==751.8.3 Details==		==751.8.3 Details==
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	<center>'''Figure 751.8.3.2.1 Typical Cross-Section of Standard Box Culvert Showing Bar Marks'''</center>		<center>'''Figure 751.8.3.2.1 Typical Cross-Section of Standard Box Culvert Showing Bar Marks'''</center>

	''B1 bar -'' Steel reinforcement shall be designed for maximum combined axial load and moment at interior walls. This bar is placed vertical near stream faces of the wall. Minimum steel reinforcement of #5 bars spaced at 12” centers shall be provided. This bar should be extended into the top and bottom slabs. A hook bar may be required if the embedment length is insufficient due to slab thickness limitations. [[751.5 Standard Details#751.5.11 Development and ~~Splicing of Reinforcement~~ \|EPG 751.5.~~11]~~] has information pertaining to development of tension reinforcement and hooks.		''B1 bar -'' Steel reinforcement shall be designed for maximum combined axial load and moment at interior walls. This bar is placed vertical near stream faces of the wall. Minimum steel reinforcement of #5 bars spaced at 12” centers shall be provided. This bar should be extended into the top and bottom slabs. A hook bar may be required if the embedment length is insufficient due to slab thickness limitations. [[751.5 Standard Details#751.5.9.2.8.1 Development and Lap Splice General\|EPG 751.5.9.2.8.1 Development and Lap Splice General] has information pertaining to development of tension reinforcement and hooks.

	''B2 bar –'' For culverts with bottom slabs, steel reinforcement shall be designed for the maximum positive moment in the exterior wall. For culverts on rock, steel reinforcement shall be designed for the maximum combined positive moment and axial load. This bar is placed vertical near the stream face of the wall. Minimum steel reinforcement of #5 bar spacing at 12” centers shall be provided. This bar should be extended into the top and bottom slabs. A hook bar may be required if the embedment length is insufficient due to slab thickness limitations. [[751.5 Standard Details#751.5.11 Development and ~~Splicing of Reinforcement~~ \|EPG 751.5.11]] has information pertaining to development of tension reinforcement and hooks.		''B2 bar –'' For culverts with bottom slabs, steel reinforcement shall be designed for the maximum positive moment in the exterior wall. For culverts on rock, steel reinforcement shall be designed for the maximum combined positive moment and axial load. This bar is placed vertical near the stream face of the wall. Minimum steel reinforcement of #5 bar spacing at 12” centers shall be provided. This bar should be extended into the top and bottom slabs. A hook bar may be required if the embedment length is insufficient due to slab thickness limitations. [[751.5 Standard Details#751.5.9.2.8.1 Development and Lap Splice General\|EPG 751.5.9.2.8.1 Development and Lap Splice General]] has information pertaining to development of tension reinforcement and hooks.

	''J3 bar - ''Steel reinforcement shall be designed for the maximum negative moment in the top corner of the culvert. This bar is placed vertical along the wall and transversely perpendicular to the centerline of culvert.		''J3 bar - ''Steel reinforcement shall be designed for the maximum negative moment in the top corner of the culvert. This bar is placed vertical along the wall and transversely perpendicular to the centerline of culvert.

Smithk: Updated website link for increased security

2021-10-25T14:48:08Z

Updated website link for increased security

← Older revision		Revision as of 09:48, 25 October 2021
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	\|colspan="2"\|<center>'''Fig. 751.8.3.3.1 Details of Plan Showing Rock Elevations for Alternate #1'''</center>		\|colspan="2"\|<center>'''Fig. 751.8.3.3.1 Details of Plan Showing Rock Elevations for Alternate #1'''</center>
	\|-		\|-
	\|colspan="2"\|'''Note:''' See [~~http~~://epg.modot.~~mo.gov~~/index.php?title=751.50_Standard_Detailing_Notes#A2._Concrete_Box_Culverts_and_Other_Type_Structures EPG 751.50 A2] for appropriate notes to include on plans.		\|colspan="2"\|'''Note:''' See [https://epg.modot.org/index.php?title=751.50_Standard_Detailing_Notes#A2._Concrete_Box_Culverts_and_Other_Type_Structures EPG 751.50 A2] for appropriate notes to include on plans.
	\|-		\|-
	\|colspan="2"\|'''Instruction:''' All box culverts on rock shall have the rock elevations shown on the plans at significant changes along each wall.		\|colspan="2"\|'''Instruction:''' All box culverts on rock shall have the rock elevations shown on the plans at significant changes along each wall.

Smithk: /* 751.8.3.2 Steel Reinforcement */

2021-09-16T18:13:41Z

751.8.3.2 Steel Reinforcement

← Older revision		Revision as of 13:13, 16 September 2021
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	''R3 bar -'' Provide minimum #5 bar spacing at 12” centers. This bar is placed perpendicular to longitudinal axis of downstream headwall or edge beam.		''R3 bar -'' Provide minimum #5 bar spacing at 12” centers. This bar is placed perpendicular to longitudinal axis of downstream headwall or edge beam.

	[[image:751.8.3.2.2 2021.jpg\|center\|~~775px~~]]		[[image:751.8.3.2.2 2021.jpg\|center\|875px]]
	<center>'''Fig. 751.8.3.2.2 Typical Sections and Details of Steel Reinforcement</center>'''		<center>'''Fig. 751.8.3.2.2 Typical Sections and Details of Steel Reinforcement</center>'''

Smithk: /* 751.8.3.2 Steel Reinforcement */ Per BR, revised increments for legs of shaped bars from ⅛” to ¼” due to upcoming move to new bill of reinforcing steel software that does not allow ⅛” increments

2021-09-16T18:10:37Z

751.8.3.2 Steel Reinforcement: Per BR, revised increments for legs of shaped bars from ⅛” to ¼” due to upcoming move to new bill of reinforcing steel software that does not allow ⅛” increments

← Older revision		Revision as of 13:10, 16 September 2021
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	''R3 bar -'' Provide minimum #5 bar spacing at 12” centers. This bar is placed perpendicular to longitudinal axis of downstream headwall or edge beam.		''R3 bar -'' Provide minimum #5 bar spacing at 12” centers. This bar is placed perpendicular to longitudinal axis of downstream headwall or edge beam.

	[[image:751.8.3.2.2 ~~2015~~.jpg\|center\|775px~~\|thumb\|~~<center>'''Fig. 751.8.3.2.2 Typical Sections and Details of Steel Reinforcement</center>''']]		[[image:751.8.3.2.2 2021.jpg\|center\|775px]]
			<center>'''Fig. 751.8.3.2.2 Typical Sections and Details of Steel Reinforcement</center>'''

	'''Wings'''		'''Wings'''