Text Size:   A+ A- A   •   Text Only
Site Image

Proposed BDDM Changes for April, 2015

Letter from State Bridge Engineer, Bruce V. Johnson 

Proposed updates to the Bridge Design and Drafting Manual

The following revisions are in reference to current BDDM section numbers:


Section 1 – Design and Detailing Practices

1.2.2      Bridge Design Deviations – Clarifies and revises the circumstances that require a design deviation.

1.5.1&2  Concrete, General & Concrete Finish - Clarify HPC use and concrete finish in pedestrian bridge decks.  High Strength Reinforcement – Update high strength reinforcement information to reflect industry progress.  Provide Grade 80 Deck design charts. Concrete, Fillets – Expand on fillet requirements at end beams and crossbeams. Painting or coating of new or existing metal – Introduce requirements for design of new structures to address future painting and inspection needs. Process for recoating of an existing metal structure – Provide a checklist to ensure all variables are addressed during a recoating project.

 1.9.1     Decks – Highly discourages the use of thermal systems on bridge decks unless supplied by a natural heat source. Precast Concrete Deck Panels – Update UHPC availability information and incorporate lessons learned on recent projects.
1.9.4  Deck Overlays - Revise policy to include PCC overlays in deck stiffness and capacity calculations.
1.13 Glossary – Add definitions to glossary to clarify rail terms: “Retrofit”, “Rehabilitation”, “Replacement” and “Strengthening”.
1.13.2   Bridge Rail Retrofit Guidelines - Clarify and revise rail retrofit and rehab procedures and design requirements.
1.24.5 Deck Drainage – Clarify when drainage curb for bridge pedestrian rail is needed
1.26.5   Corrosion Protection for Steel Piling – Clarify soil testing requirements and corrosion protection systems based on site environment.   
1.30.2  Permanent Strengthening of Reinforced Concrete Bridges - Clarify intent of strengthening methods listed to state that other strengthening methods can also be considered.


Section 2 – Drafting Practices



Section 3– Procedures and Layout

3.2.3   MathCAD Template Library – Add the recently developed Bridge Calculation Template to the library list.

3.3 Bridge Design Process – Update section to reflect current practice and incorporate changes resulting from Task Force B.

3.14.10 Utilities – Revise the voltage limit allowed on bridges and redefine high voltage to conform to industry standards.


Update Summary