Mitigation of Weldment Cracking in Steel Highway Structures Due to the Galvanizing Process (2021) / Chapter Skim
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From page 74... ...
74 This attachment contains proposed changes to (1) AASHTO LRFD Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, first edition (2015)
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Proposed Specification Changes 75 Suggested Revisions to the AASHTO LRFD Specifications for Structural Supports for Highway Signs, Luminaires, and Traffic Signals, First Edition (2015) The specific articles in the specifications to which changes are proposed are included in this attachment.
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From page 76... ...
76 Mitigation of Weldment Cracking in Steel Highway Structures Due to the Galvanizing Process The following edits to C5.6.2 are recommended to more accurately identify the corners of multisided poles as stress concentrations that may increase the risk of cracking during galvanization. 5.6.2 – Minimum Number of Sides Tubular structures shall be of round or multisided crosssection, Cross-sections with concave external surface, such as "fluted" cross-sections, are not covered by the provisions for multisided cross-sections and shall not be used without approval of the owner.
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From page 77... ...
Proposed Specification Changes 77 arms using fluted and other complex hollow sections should require verification of the materials, design methods, detailing requirements, fabrication methods, and fatigue performance by analysis and testing of components and systems.
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From page 78... ...
78 Mitigation of Weldment Cracking in Steel Highway Structures Due to the Galvanizing Process The following edits to C5.6.3 are recommended to clarify that increasing transverse plate thickness may be advisable for design for fatigue in ungalvanized structures, but it may increase the risk of liquid metal assisted cracking during galvanization. A limit of 6.0 for the ratio of base plate thickness to pole thickness is recommended for multisided poles.
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From page 79... ...
Proposed Specification Changes 79 The following edits to 14.4.7.3 are recommended to assist designers and galvanizers in mitigating cracking during galvanization. 14.4.7.3 – Galvanized Structures Hot-dip galvanizing after fabrication shall conform to the requirements of ASTM A123.
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From page 80... ...
80 Mitigation of Weldment Cracking in Steel Highway Structures Due to the Galvanizing Process significant differences between the stiffness and/or thermal mass of their components or parts because large stresses and permanent deformations may be induced during galvanizing. Large differences in stiffness and/or mass of components worsen this problem.
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From page 81... ...
Proposed Specification Changes 81 Suggested Revisions to the AASHTO LRFD Bridge Design Specifications, Eighth Edition (2017) The specific articles in the specifications to which changes are proposed are included in this chapter.
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From page 82... ...
82 Mitigation of Weldment Cracking in Steel Highway Structures Due to the Galvanizing Process in. for nonstructural applications or bearing assembly components.
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From page 83... ...
Proposed Specification Changes 83 The following additions to 6.7 are recommended to assist designers and galvanizers in mitigating cracking during galvanization. 6.7.9 – Galvanizing Hot-dip galvanizing after fabrication shall conform to the requirements of ASTM A123.
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From page 84... ...
84 Mitigation of Weldment Cracking in Steel Highway Structures Due to the Galvanizing Process significant differences between the stiffness and/or thermal mass of their components or parts because large stresses and permanent deformations may be induced during galvanizing. Large differences in stiffness and/or mass of components worsen this problem.
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