Design Criteria

All steel straddle bent caps must satisfy the requirements in the manual and must be evaluated for redundancy according to
AASHTO Guide Specifications for Internal Redundancy of Mechanically-Fastened Built-up Steel Members or AASHTO Guide Specifications for Analysis and Identification of Fracture Critical Members and System Redundant Members,
as applicable
Members or portions that would otherwise be classified as Nonredundant Steel Tension Members (NSTM) when evaluated based on load path redundancy alone, shall instead be designated in the contract documents as SRMs (system redundant members) or IRMs (Internal redundant members) and need not be subject to the hands-on in-service inspection protocol for NSTM as described in 23 CFR 650. The SRMs or IRMs shall be fabricated according to the American Welding Society (AWS) D1.5 Bridge Welding Code Fracture Control Plan (FCP).