Dynamic Response of Highway Guardrail Post Foundations
by Jey K. Jeyapalan, Univ of Wisconsin, Madison, WI, USA,
Abstract: The highway departments use two types of guardrail posts: a circular wood post and a steel W6 multiplied by 8. 5 post. The current specifications require the steel post to be placed in a concrete footing. However, the concrete footing is not required for the wood post. Because of this requirement, the steel post guardrail systems are considered not as economical as the wood post guardrail systems. The research study was conducted to determine whether the concrete footings are necessary for the steel guardrail posts to perform satisfactorily as a traffic barrier system. An analytical model was developed to model the guardrail post as a laterally loaded drilled shaft. A series of static and dynamic impact load tests were performed to verify analytical predictions.
Subject Headings: Guardrails | Lateral loads | Highways and roads | Concrete | Footings | Load tests | Wood | Steel
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