Re-evaluating the relationship between load transfer characterisation values for rigid aircraft pavement construction joints

Abstract

Rigid aircraft pavement load transfer is typically characterised by load transfer efficiency via deflection (LTEδ), or free-edge stress transferred (LT). LTEδ is relatively easily calculated from falling weight deflectometer field measurements and is routinely assessed for existing slabs. In contrast, LT is commonly used as an input for thickness design. However, LT is difficult to measure in the field. Consequently, understanding the relationship between LTEδ and LT can improve rigid aircraft pavement design and evaluation strategies. Although relationships exist for load transfer characterisation values, they are built on generalised assumptions for free-edge deflection and stress. This study re-evaluated the relationships between typical load transfer values for three different construction joint types using finite element methods. It was determined that the relationship between LT and LTEδ is largely dependent on construction joint type. Furthermore, predictive models for different construction joints were developed to relate LTEδ to LT. The findings from this research can be used to better relate load transfer field measurements, to thickness design assumptions, for rigid aircraft pavements.