To satisfy FHWA requirements, TxDOT Bridge Division must approve each steel twin tub girder bridge design for system redundancy. At the 60% PS&E level, in coordination with the District Bridge Engineer, send a pdf of the following documents to the Bridge Division Design Section Director for Bridge Division approval.

Bridge Layout
Steel twin tub girder plan sheets
Steel twin tub girder design calculation package shall meet the requirements of AASHTO Chapter 6, including the calculations demonstrating redundancy. Include explanation of assumptions for modeling and modeling method used if a refined method is utilized as specified in this Section.

Upon TxDOT's acceptance and approval of 100% Plans, submit final calculation package in accordance with TxDOT Bridge Design Manual – LRFD Chapter 6, including final redundancy calculations, as well as the full completed refined analysis records/computer models as this information will be retained and included with the bridge inspection management system

An approval memo will be sent to the District and filed in the bridge inspection management system.