751.3 Structural Steel Design Properties: Difference between revisions

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==751.3.1 Structural Steel (AASHTO M270/ASTM A709)==
'''Structural Steel (AASHTO M270/ASTM A709)'''


All structural steel will be AASHTO M270/ASTM A709 Grade 36 (<math>\,F_y</math> = 36 ksi) or Grade 50 (<math>\,F_y</math> = 50 ksi) except where weathering steel (AASHTO M270/ASTM A709 Grade 50W steel) is indicated on the Design Layout or in special cases. '''See Project Manager for use of structural steel with <math>\,F_y</math> greater than 50 ksi.'''
All structural steel will be AASHTO M270/ASTM A709 Grade 36 (F<sub>y</sub> = 36 ksi) or Grade 50 (F<sub>y</sub> = 50 ksi) except where weathering steel (AASHTO M270/ASTM A709 Grade 50W steel) is indicated on the Design Layout or in special cases. Welded or seamless steel shell (pipe) for CIP pile will be ASTM A252 Modified Grade 3 (F<sub>y</sub> = 50 ksi). For pipe common available nominal wall thicknesses, see [[751.36_Driven_Piles#751.36.2.2.2_Cast-In-Place_(CIP)_Pile|EPG 751.36.2.2.2]]. '''See Project Manager for use of structural steel with F<sub>y</sub> greater than 50 ksi.'''
 
Note: ASTM A709 Grade 50S shall not be specified for HP piles or other structural shapes without prior confirmation of the availability of the material.


{|border="1" style="text-align:center;" cellpadding="5" align="center"  
{|border="1" style="text-align:center;" cellpadding="5" align="center"  
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|+'''Available Material'''
|+'''Available Material'''
|-  
|-  
|'''Grade'''||Minimum Yield Strength, <math>\,F_y</math>(ksi)||MaximumPlateThickness(inches)||Shapes
!style="background:#BEBEBE"|Grade!!style="background:#BEBEBE"|Minimum Yield Strength,<br/>F<sub>y</sub>, ksi!!style="background:#BEBEBE"|Maximum Plate Thickness,<br/>inches!!style="background:#BEBEBE"|Shapes
|-
|-
|36||36||4 (*)||All
|36||36||4<sup>1</sup> ||All
|-
|-
|50||50||4||All
|50||50||4||All
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|-
|-
| rowspan="2"| HPS70W
| rowspan="2"| HPS70W
| rowspan="2"| 70 ||2" TMCP (**)|| rowspan="2"| N/A  
| rowspan="2"| 70 ||2" TMCP<sup>2</sup>|| rowspan="2"| N/A  
|-
|4" Q&T<sup>3</sup>
|-
|colspan="4" align="left" width="450"|<sup>1</sup> Thickness of plate up to 8 inches may be used when fabricating bearings using ASTM A709 Grade 36 steel.
|-
|colspan="4" align="left"|<sup>2</sup> TMCP, Thermo Mechanical Controlled Process
|-
|-
|4" Q & T (***)
|colspan="4" align="left"|<sup>3</sup> Q&T, Quenched & Tempered
|}
|}
:(*) Thickness of plate up to 8 inches may be used when fabricating bearings using ASTM A709 Grade 36 steel.
:(**) TMCP, Thermo Mechanical Controlled Process
:(***) Q&T, Quenched & Tempered


[[Category:751 LRFD Bridge Design Guidelines|751.03]]
[[Category:751 LRFD Bridge Design Guidelines|751.03]]

Latest revision as of 13:06, 20 August 2024

Structural Steel (AASHTO M270/ASTM A709)

All structural steel will be AASHTO M270/ASTM A709 Grade 36 (Fy = 36 ksi) or Grade 50 (Fy = 50 ksi) except where weathering steel (AASHTO M270/ASTM A709 Grade 50W steel) is indicated on the Design Layout or in special cases. Welded or seamless steel shell (pipe) for CIP pile will be ASTM A252 Modified Grade 3 (Fy = 50 ksi). For pipe common available nominal wall thicknesses, see EPG 751.36.2.2.2. See Project Manager for use of structural steel with Fy greater than 50 ksi.

Note: ASTM A709 Grade 50S shall not be specified for HP piles or other structural shapes without prior confirmation of the availability of the material.

Available Material
Grade Minimum Yield Strength,
Fy, ksi		 Maximum Plate Thickness,
inches		 Shapes
36 36 41 All
50 50 4 All
50W 50 4 All
HPS70W 70 2" TMCP2 N/A
4" Q&T3
1 Thickness of plate up to 8 inches may be used when fabricating bearings using ASTM A709 Grade 36 steel.
2 TMCP, Thermo Mechanical Controlled Process
3 Q&T, Quenched & Tempered
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