Bridge and Structures

Using I-35W Bridge Vibration Monitoring Response to Understand the Impact of Environmental Effects

The project would identify the impact of environmental effects (temperature and humidity) on natural frequency and mode shapes. The previous study on the feasibility of vibration-based monitoring highlighted the variation of natural frequency as a function of temperature and season; however, the variation was not consistent among mode shapes. In particular, the variation is not linear with temperature and not monotonic for some modes. If the phenomenon is well understood, the environmentally induced variations could be leveraged or compensated for to simplify the use of vibration-based monitoring.

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Idea Submitted by : Lauren Linderman and Carol Shield

List your MnDOT Office,District,City, County, Univ. or Other : University of Minnesota; Department of Civil, Environmental, and Geo-Engineering

Idea Champion - Who at MnDOT/LRRB? : Paul Rowekamp

Why is this a priority and what are the benefits for the State/County/City? :

The project would leverage the investment in the I-35W St. Anthony Fall’s Bridge monitoring and previous vibration signature results to understand the impact of environmental factors on natural frequency. Minnesota bridges experience some of the largest daily and yearly temperature changes and gradients throughout the United States, making bridge monitoring in Minnesota more challenging than in many other states. The results from the proposed project could be expanded to the long-term monitoring of bridges throughout Minnesota. 


Project Type - MnDOT or LRRB / Research, Implementation or TRS : MnDOT Research

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Idea No. 141