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Rolling Tire Functions for Finite Element Models
Modeling a moving load, such as a tire rolling across a roadway, across discretized elements entails a correlation of nodal excitation shape and time between the various structural elements. Decoupling the roadway from the vehicle and geometry simplification leads to model loading complexities. For example, the context of this study is in the application of modular bridge expansion joints, where tires rolling across finite width beams are modeled using zero width FE beam elements. Similarly, though plate elements can be used to model a tire rolling over a plate (or roadway), the plate finite element itself is composed of zero width rows of nodes. If the nodes are closely spaced relative to the tire footprint, the problem becomes greatly simplified — a sine wave can be used as the excitation kernel. However, if the nodes are not compact the use of a simple sine wave excitation produces higher frequency overtones resulting in an unnatural model response. The tire-rolling problem, i.e. modeling a moving load over discrete nodes, is fundamental to transient finite elements. It is in essence the same problem whether modeling a rolling tire on an expansion joint, a cover plate, a roadway, or the sun as a moving heat source on the planet earth. The derivation of an excitation kernel that can be applied to rows of evenly spaced finite element nodes such that a rolling tire load is accurately simulated is addressed in this paper. Comparisons are made showing that the theory presented shows good correlation with field test results.
Rolling Tire Functions for Finite Element Models
Modeling a moving load, such as a tire rolling across a roadway, across discretized elements entails a correlation of nodal excitation shape and time between the various structural elements. Decoupling the roadway from the vehicle and geometry simplification leads to model loading complexities. For example, the context of this study is in the application of modular bridge expansion joints, where tires rolling across finite width beams are modeled using zero width FE beam elements. Similarly, though plate elements can be used to model a tire rolling over a plate (or roadway), the plate finite element itself is composed of zero width rows of nodes. If the nodes are closely spaced relative to the tire footprint, the problem becomes greatly simplified — a sine wave can be used as the excitation kernel. However, if the nodes are not compact the use of a simple sine wave excitation produces higher frequency overtones resulting in an unnatural model response. The tire-rolling problem, i.e. modeling a moving load over discrete nodes, is fundamental to transient finite elements. It is in essence the same problem whether modeling a rolling tire on an expansion joint, a cover plate, a roadway, or the sun as a moving heat source on the planet earth. The derivation of an excitation kernel that can be applied to rows of evenly spaced finite element nodes such that a rolling tire load is accurately simulated is addressed in this paper. Comparisons are made showing that the theory presented shows good correlation with field test results.
Rolling Tire Functions for Finite Element Models
Bradford, P. (author)
Structures Congress 2009 ; 2009 ; Austin, Texas, United States
Structures Congress 2009 ; 1-10
2009-04-29
Conference paper
Electronic Resource
English
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