United States Department of Transportation
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KSU S4M: Settlement Stabilization Through Structural Strengthening and Monitoring of KDOT Bridge 059–045 Shawnee Drive Over I-135
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2021-03-01
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[PDF-9.25 MB]
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Edition:Final Report May 2016–April 2022
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Abstract:The Bridge 059-045 at Shawnee Drive over I-135 is a reinforced concrete box girder structure constructed in 1965 to connect the rural Shawnee Drive across the Interstate I-135 near McPherson, KS, in between Salina and Wichita. The bridge was observed during annual inspection in 1998 to have experienced some settlement due to its proximity to a sinkhole. This settlement progressed to noticeable levels in 2012 necessitating a semi-annual elevation profile survey that was consistently conducted by KDOT. In April 2016, KDOT determined that the bridge requires a detailed analysis to determine the safety and suitability of the bridge to stay open to traffic. Accordingly, a project was started by Kansas State University to perform a detailed finite element analysis to assess the level of distress in the bridge due to the continuous differential settlement caused by the active sinkhole deep in the soil under the bridge. Detailed finite element analysis was performed in this study revealing the fact that some structural components in this bridge are still safe while others have reached their ultimate envelope capacity, thus, suggesting the closure of the bridge to general traffic. An estimated cost for strengthening is given in Section 5.2.5 of this report. Knowing that the strengthening will only extend the bridge’s life up to May 2022, considering the settlement rate, it is recommended to demolish the bridge instead of strengthening it.
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