- 期刊
The Impact of Strain Gage Instrumentation on Localized Strain Responses in Asphalt Concrete Pavements
並列摘要
Reliable determination of pavement response to variable environmental and traffic conditions is essential for successful mechanistic design of asphalt concrete (AC) pavements. By measuring the responses directly, the assumptions and simplifications are not of concern. However, the introduction of the instrumentation into the pavement structure may itself inherently and significantly affect the pavement responses. This concern has led to questions about what is actually being measured by in-situ gages. When comparing measured and predicted responses, can one set of information be considered the ”ground truth?” In this paper, the impact of gage instrumentation on localized strain responses in AC pavements is evaluated through finite element (FE) simulations. The distinct feature of the developed 3-D FE model is the inclusion of elastic strain gages in viscoelastic AC layers. These strain gages were modeled in both longitudinal and transverse directions at multiple depths within the AC layers. Influencing factors such as pavement temperature, vehicle speed, contact pressure, tire wander, and AC mixture were considered. FE simulations reveal that the inclusion of a strain gage results in considerably lower strain responses than otherwise predicted. This is manifested most at high pavement temperatures, low vehicle speeds, and high contact pressures. The presence of a strain gage may result in a prediction error of up to 73 percent for the conditions and materials considered.
參考文獻
延伸閱讀
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