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.
188.8.131.52.8 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.
Bridge Rail- Provide guidance on design deviations and exceptions, provide crash test data and clarify crash test requirements.
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