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
1.2.1_and_2 Bridge Design Standards – Update title and reference manuals.
Design Deviations – Update name and email. Add clarification.
1.5.1 Concrete, General – Update
section for the use of 80ksi reinforcing.
188.8.131.52.7 *Tension Development Length - GRADE 60
– Uncoated Bars
184.108.40.206.8 *Compression Development Length - GRADE
60 – Uncoated Bars
220.127.116.11.9 *Tension Development Length of Hooks - GRADE 60 – Uncoated
18.104.22.168.10 Welded Splices and Mechanical Connections
22.214.171.124.10 Fixed Girder Connections – Provide additional guidance to age of girder
1.9.1 Design and Detailing – Update
deck reinforcing tables for the use of 80ksi reinforcing and 4500psi concrete.
1.10.4 Foundation Modeling – Remove
outdated software reference, and update Foundation Designer to Geotechnical
126.96.36.199 Spread Footing Foundation Design – Update
resistance factors to be consistent with ODOT GDM.
1.13 Rails, Impact Attenuators, and
Protective Screening – Update for consistency and clarity; clarify design
deviation vs exception; update bridge rail retrofit section; rearrange
protective screening section for clarity.
1.17 Seismic Design – Design using
2014 USGS and CSZE Seismic Hazard Maps.
1.27 On Bridge Sign &
Illumination Mounts – Update guidance to be consistent with ODOT Traffic
Structures Design Manual.
1.28 Truss and Monotube Cantilever
Sign Bridges – Provide basic references to the design of truss and monotube
cantilever sign bridges.
Section 2 – Drafting Practices
Section 2 Update to use to Digial Signature and Projectwise. Old version
(with minor changes) will be available for current project completion.
Section 2 not showing the red mark-ups for clearity.
2.1 Computer Aided Drafting (CAD)
- Updated for digitally signed plans
2.2 thru 2.4 Detailing, Drawing Borders, Title Block Information - Updated for
true type font and 11x17 sheet format digitally signed plans
2.5 Lead Drafters Duties on Large
Projects - Changes for clarification
Size and Location Plan and Elevation - Changes for clarification, use of
coordinate correct plan view base file and change in location map work flow
Plans - Changes for clarification, 11x17 sheet format and updated work flow
Data Sheet –Changed to a summary; moved to Geotechnical Design Manual (GDM) to
minimize conflicts between manuals
- Updated for digitally signed plans; removed redundancy with other documents
of Electronic Files to Outside of ODOT - Changes for clarification
CAD Files - Removed redundancy with other documents
Appendices Changes for clarification, 11x17 sheet format, removed redundancy
with other documents and true type font
Section 3– Procedures and Layout
3.2.3 MathCAD Template Library – Update the recently developed Bridge Calculation
Template to the library list.
A3.91.7 Miscellaneous Common Conversions – Update table to the use
of 80ksi reinforcing and 4500psi concrete.