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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


1.1.4.2(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".

1.5.5.1.17 ASTM A706 Grade 80 Reinforcement

1.6.4.1 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.

1.10.5.5(12) Shaft Reinforcement– Clarification of column/shaft moments for design.

1.17.2.1 & 1.17.3.1 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 3.14.4.2A, 3.14.4.2B and 3.14.4.2C.  The word “restricted” is changed to “limited”.

3.14.7.1 Hydraulics, General

 

Update Summary