United States Department of Transportation
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Impact of Legalized 25-Kip Axle Loads for Self-Propelled Implements of Husbandry on Iowa Bridges [Tech Transfer Summary]
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2024-10-01
[PDF-1.64 MB]
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Abstract:This research aimed to assess bridge behavior under terragator-type implements of husbandry (IoH) with 25 kip axle loads. The key objectives were as follows: 1. Identify current in-service terragator-type legal vehicles per Iowa Code 321.463.a(1)(2). 2. Perform live load tests of bridges using terragator vehicles to determine actual live load distribution and dynamic impact factors and to calibrate bridge models. 3. Develop bridge models using finite element (FE) numerical analysis and simulate the load effects due to terragator-type vehicle crossings. 4. Compare live load distribution results to current codified live load distribution factors (LLDFs) used for typical vehicle types. 5. Compare dynamic impact factors to codified dynamic load factors. 6. Calibrate live load factors for load and resistance factor design (LRFD) and load and resistance factor rating (LRFR). 7. Develop a legally loaded terragator-type vehicle model for Iowa.
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