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Proposed BDDM Changes for October, 2014

Letter from State Bridge Engineer, Bruce V. Johnson 

Updates to the Bridge Design and Drafting Manual



Section 1 – Design and Detailing Practices

1.3.4       Loads and Distribution- Reformat section to be compatible with LRFD format.  Precast Prestressed Concrete Elements – Provide guidance on intermediate diaphragm placement.

1.9.1     Deck Design and Detailing – P/T anchorage exception to the #6 bar limit in deck reinforcement. Drilled Shaft Reinforcement – Clarify drilled shaft reinforcing requirements. Drilled Shaft Cover Requirements – Address shaft vs column size & spacing between rebar cages to be feasible with all shaft diameters.
1.13.1 Bridge Rail- Provide guidance on design deviations and exceptions, provide crash test data and clarify crash test requirements.
1.26.5   Pile Corrosion Protection- Provide pile corrosion rates for foundation design and guidence on methods of protecting piles.     Strengthening of Bridges – Specify FRP strengthening system material data in to assist future evaluation and load rating.


Section 2 – Drafting Practices



Section 3– Procedures and Layout



Update Summary