Bridge and Structures

Bridge and Structures

Re-tightening the Large Anchor Bolts of Support Structures for Signs and Luminaires: Phase II

Currently MnDOT is experiencing problems with loose nuts at the anchor bolts of various transportation structures including signs and luminaires. To address this issue, MnDOT funded a research project titled “Re-tightening the Large Anchor Bolts of Support Structures for Signs and Luminaires,” which will end in June 2018. In this project, the researchers developed guidelines with tables and charts for tightening and re-tightening ...more »

Submitted by (@anchen)

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Bridge and Structures

Steel Reinforcement Section Loss Guidance Tables

MnDOT has seen substructures with concrete cover spalling and delamination from aging infrastructure exposed to deicing salts and leaking joints. Many of these bridges were built under design specifications that would not meet current reinforcement detailing and reinforcement area calculations. When bridge repairs are scheduled, it is unknown the level of reinforcement section loss should be assumed. Actual reinforcement ...more »

Submitted by (@paul.pilarski)

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