When using delegated connection design, which responsibilities belong to the EOR and which belong to the detailer?  Who is ultimately responsible for the adequacy of the connection design and what does the Code of Standard Practice require?

In the May 2025 SEU Session, Kyle Jenkins, PE, from Advantage Structural Engineers, presented Tips for the EOR when Delegating Steel Connection Design.  Kyle explained ways to produce better drawings that provide the information needed for safe and efficient delegated connection design.  He described the importance of communication in the delegated design process and gave examples of negative outcomes that can come from poor communication.  Kyle identified some best practices for setting up and delegating types of shear, moment, and bracing connections.

Kyle referenced the Code of Standard Practice which is located in the back of the steel manual, and specifically noted sections 3 and 4, as it applies to delegated connection design.  As you can see in the slide below, Kyle noted that the COSP Section 3.2.3 states the requirements for connections:

Option 3 specifically relates to delegated connection design; however it is worth noting that the COSP requires that the EOR indicate which option is being utilized for each connection.  The EOR has the option to design some connections while delegating others.  This should be clearly indicated on the drawings so that the fabricator can properly bid the cost.

When using Option 3, the COSP specifies that the EOR supply the necessary information for bidding, which includes connection reactions, whether ASD or LRFD is to be used, and required member reinforcement needed, such as stiffeners and thru-plates.  Failure to provide this information can result in inaccurate bidding or costly change orders, and possibly an inadequate design.  Kyle noted that Section 4 of the COSP lays the final authority of the connection design on the EOR, as you can see below.  This responsibility is fulfilled through the submittal review and approval process.  

The use of delegated design can only be successful with open lines of communication between the EOR and the detailer.  Delays or poor communication can have costly consequences.  A team mindset is necessary to ensure the detailer understands the intent of the EOR and is able to provide connections that meet the code standard.  However, the EOR is ultimately responsible for the complete design of a safe, code-compliant structure, which includes adequate connections.