Agency TRANSPORTATION DEPT

Contractor University of Minnesota

SWIFT Contract Number 48004/3000064604, 3000089

Project Name Anchorage of Shear Reinforcement in Prestressed Co

Project Number (if applicable) 99008 W41

Summarize purpose of the contract, including why it was necessary: The transverse reinforcement used to resist shear in prestressed concrete bridge girders has been typically configured with "straight legs" to facilitate girder construction. This configuration is readily placed by insetting the reinforcement cage into the forms after stressing the prestressing strands. Most recommended details, however, require stirrups to be fabricated with bent legs that encompass the longitudinal reinforcement which serves to anchor the stirrups. Such a configuration is recommended to ensure that the stirrup will be able to develop its yield strength with a short anchorage length to resist shear within the web ofthe girder. In the case of prestressed concrete bridge girders with "straight leg" transverse reinforcement, the expectation is that the precompression in the girders will serve to enhance the anchorage of the transverse reinforcement, thereby enabling the straight bar detail. The purpose of this project is to investigate the anchorage of straight-legged stirrups in prestressed concrete girder subassemblages to ensure that the yield of the transverse reinforcement can be achieved in a number of configurations.

Project Duration

Start Date Fri, 06/29/2012 - 00:00

Original end date Sun, 11/30/2014 - 00:00

Actual end date Sun, 11/30/2014 - 00:00

Did project finish on time? Yes

Total billable hours utilized (if applicable) {Empty}

Contract Amounts

Original contract: $175000.00

Amendments {Empty}

Contract total $175000.00

Did project finish within budget? Yes

What was the funding source? TH

Is this a sole source contract? No

If this was a single source contract, explain why the agency determined there was only a single source for the services (if applicable) {Empty}

Evaluator Name Jilk, Benjamin

Evaluator Email Address ben.jilk@state.mn.us

Evaluate the contractor's timeliness Got things done when they needed to in a timely manner.

Evaluate the contractor's quality The work performed was exceptional.

Evaluate the contractor's cost The cost was reasonable for the work performed.

Evaluate the contractor's overall performance The work was exceptional. The results of this project save MnDOT money overall and give confidence in our methods used in design.

Would you engage the contractor's services again? Yes

Describe any negative action taken during the duration of this contract (i.e., termination, pursuit of suspension, etc.): {Empty}

Please rate the overall experience with the contractor 5 - very satisfied