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Proposed BDDM Changes for May, 2014

Letter from State Bridge Engineer, Bruce V. Johnson 

Updates to the Bridge Design and Drafting Manual



Section 1 – Design and Detailing Practices Pile Supported Footings – Revised terminology and procedure to align with current AASHTO LRFD Bridge Design Specifications.

1.3.2(5)   Live Loads – Clarification on policy regarding higher level techniques for calculating live load distribution factors.


1.5.1 and 1.9 Concrete and Decks– Minimum aggregate size increased from ¾” to 1". ASTM A706 Grade 80 Reinforcement Grade 80 Reinforcement – Correction to information on grade 80 rebar.

1.9.1         Deck Design & Detailing – ODOT preferred deck rebar orientation changed to transverse bars on top. 

1.9.4 Deck Overlays– Overlay provisions updated based on industry input. Shaft Reinforcement– Clarification of column/shaft moments for design. & General Considerations – Seismic terminology changed to match AASHTO LRFD terminology.


1.24 Bridge Drainage – Designer guidance for bridge drainage is added.  Standard details are updated.


Section 2 – Drafting Practices


2.4 Title Block Information – Reminder added to submit as-constructed plans to Bridge HQ.  

A2.7.3 Plan and Elevation– Correction to seismic general notes.


Section 3– Procedures and Layout

3.2.1  Design Software – Information on ODOT supported software is updated.

3.3 Bridge Design Process (DBB), Overview – Revisions to Bridge Design Process based on discussions with design staff.

3.4 Roles & Responsibilities – Revisions to Roles & Responsibilities based on discussions with design staff.

3.5             Quality – Minor revisions to Quality based on discussions with design staff.

3.14.4 Roadway Coordination with other Project Team Members – Revised Figures, and  The word “restricted” is changed to “limited”. Hydraulics, General


Update Summary