Agrawal, Ravi Prakash (2005-05). Using finite element analysis of retroreflective raised pavement markers to recommend testing procedures for simulating their field performance. Master's Thesis. Thesis uri icon

abstract

  • Retroreflective Raised Pavement Markers (RRPMs) supplement other pavement markings to provide guidance to road users. Previous research concerning durability of the RRPMs suggests that their performance has been degrading over the years. One of the main causes for underperformance of the RRPMs is the lack of appropriate laboratory testing standards that can test the adequacy of the RRPMs to perform in field conditions. There is a need to modify the existing standards or develop new testing procedures that can better simulate field conditions. This requires identifying critical locations and magnitudes of stresses inside the markers during the tire-marker impacts that happen on roads. The goal of this research was to identify critical magnitudes and locations of the stresses in RRPMs during the tire-marker impacts by doing the finite element modeling and simulation of the impacts, and use the information to recommend laboratory testing procedures that could simulate real-world conditions. The researcher modeled and simulated the tire-marker impacts using the finite element tools Hypermesh and LS DYNA. He calibrated the material properties of the marker models to improve the tiremarker model. Based on the tire-marker impact simulations, the researcher concluded that the critical compressive stresses during impacts are located at the edge contacts of retroreflective sides with the top surface. The critical stresses may also occur at lower and upper corners of the marker. The other areas, especially the lower half of the marker, had tensile stresses. Angle of impact was found to be a critical external variable that affected the stresses inside the markers and the marker-pavement interface forces. The researcher then modeled and simulated a few laboratory-testing procedures that could simulate the field performance of the RRPMs. Based on these simulations, the researcher recommended that the ASTM compression test for evaluation of RRPMs be continued or a similar test be developed. He suggested development of one new test (named as offset compression test) that could better replicate the field conditions. He also recommended having a review of the ASTM flexural test.
  • Retroreflective Raised Pavement Markers (RRPMs) supplement other pavement
    markings to provide guidance to road users. Previous research concerning durability of
    the RRPMs suggests that their performance has been degrading over the years. One of
    the main causes for underperformance of the RRPMs is the lack of appropriate
    laboratory testing standards that can test the adequacy of the RRPMs to perform in field
    conditions. There is a need to modify the existing standards or develop new testing
    procedures that can better simulate field conditions. This requires identifying critical
    locations and magnitudes of stresses inside the markers during the tire-marker impacts
    that happen on roads.
    The goal of this research was to identify critical magnitudes and locations of the
    stresses in RRPMs during the tire-marker impacts by doing the finite element modeling
    and simulation of the impacts, and use the information to recommend laboratory testing
    procedures that could simulate real-world conditions. The researcher modeled and
    simulated the tire-marker impacts using the finite element tools Hypermesh and LS DYNA. He calibrated the material properties of the marker models to improve the tiremarker
    model.
    Based on the tire-marker impact simulations, the researcher concluded that the
    critical compressive stresses during impacts are located at the edge contacts of
    retroreflective sides with the top surface. The critical stresses may also occur at lower
    and upper corners of the marker. The other areas, especially the lower half of the marker,
    had tensile stresses. Angle of impact was found to be a critical external variable that
    affected the stresses inside the markers and the marker-pavement interface forces.
    The researcher then modeled and simulated a few laboratory-testing procedures
    that could simulate the field performance of the RRPMs. Based on these simulations, the
    researcher recommended that the ASTM compression test for evaluation of RRPMs be
    continued or a similar test be developed. He suggested development of one new test
    (named as offset compression test) that could better replicate the field conditions. He
    also recommended having a review of the ASTM flexural test.

publication date

  • August 2006