Bridge Design Manual

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Bridge Design Manual


The Bridge Design Manual (BDM) M 23-50 is a guide for those who design bridges for the Washington 
State Department of Transportation (WSDOT). This manual supplements the AASHTO LRFD 
Specifications. It explains differences where it deviates from the AASHTO LRFD Specifications. 
It contains standardized design details and methods, which are based on years of experience. 
The Bridge Design Manual is a dynamic document, which constantly changes because of the creativity 
and innovative skills of our bridge designers and structural detailers. It is not intended for the design of  
unusual structures or to inhibit the designer in the exercise of engineering judgment. There is no substitute 
for experience, good judgment, and common sense

This manual and the following AASHTO Specifications are 
the basic documents used to design highway 
bridges and structures in Washington State: 
• AASHTO LRFD Bridge Design Specifications (AASHTO LRFD)
  
• AASHTO Guide Specifications for LRFD Seismic Bridge Design (AASHTO SEISMIC)

The Bridge Design Manual is not intended to duplicate the AASHTO Specifications. This manual
  
supplements the AASHTO Specifications by providing additional direction, design aides, examples, and
  
information on office practice. The Bridge Design Manual takes precedence where conflict exists with
  
the AASHTO Specifications. The WSDOT Bridge Design Engineer will provide guidance as necessary. 
References are listed at the end of each chapter.
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