Letter from State Bridge Engineer, Bruce V. Johnson
Updates to the Bridge Design and Drafting Manual
Section 1 – Design and Detailing Practices
18.104.22.168(3) 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".
22.214.171.124.17 ASTM A706 Grade 80 Reinforcement
126.96.36.199 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.
188.8.131.52(12) Shaft Reinforcement– Clarification of column/shaft moments for design.
184.108.40.206 & 220.127.116.11 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 18.104.22.168A, 22.214.171.124B and 126.96.36.199C. The word “restricted” is changed to “limited”.
188.8.131.52 Hydraulics, General