Temporary structural shoring: Why mandate Heavy Hex bolts over Standard Hex?

Elowen

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We are setting up some heavy-duty temporary steel shoring for a commercial bridge repair project. The engineering plans specifically call for Hot-Dip Galvanized "Heavy Hex" bolts for all the primary load-bearing flange connections.
We have plenty of standard HDG hex bolts in the exact same grade and length. For a temporary structure that will only be up for 8 months, does the wider head of the Heavy Hex really make that much of a structural difference? Will standard hex heads pull through the steel under heavy vibration?
 
We are setting up some heavy-duty temporary steel shoring for a commercial bridge repair project. The engineering plans specifically call for Hot-Dip Galvanized "Heavy Hex" bolts for all the primary load-bearing flange connections.
We have plenty of standard HDG hex bolts in the exact same grade and length. For a temporary structure that will only be up for 8 months, does the wider head of the Heavy Hex really make that much of a structural difference? Will standard hex heads pull through the steel under heavy vibration?
Speak with the person that made ther engineering plans. Only they will know if they've overengineered that part of the spec.
 
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