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.
126.96.36.199.17 High Strength Reinforcement – Update high strength reinforcement information to reflect industry progress. Provide Grade 80 Deck design charts.
188.8.131.52 Concrete, Fillets – Expand on fillet requirements at end beams and crossbeams.
184.108.40.206 Painting or coating of new or existing metal – Introduce requirements for design of new structures to address future painting and inspection needs.
220.127.116.11 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.
Deck Overlays - Revise policy to include PCC overlays in deck stiffness and capacity calculations.
Glossary – Add definitions to glossary to clarify rail terms: “Retrofit”, “Rehabilitation”, “Replacement” and “Strengthening”.
Bridge Rail Retrofit Guidelines - Clarify and revise rail retrofit and rehab procedures and design requirements.
Deck Drainage – Clarify when drainage curb for bridge pedestrian rail is needed
Corrosion Protection for Steel Piling – Clarify soil testing requirements and corrosion protection systems based on site environment.
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.