# Load Transfer Theoretical Analysis of a Rigid Aircraft Pavement Contraction Joint Using a Novel Approach for Crack Characterization

## TL;DR

This paper introduces a new method to analyze how cracks in aircraft pavement joints transfer loads, using a simplified sinusoidal crack shape model.

## Contribution

A novel approach to crack characterization using an idealized two-dimensional sinusoidal shape for modeling aggregate interlock stiffness.

## Key findings

- Joint opening was identified as the most significant factor affecting load transfer in contraction joints.
- Finite element analysis showed the importance of crack shape in modeling aggregate interlock stiffness.
- The proposed model needs further validation against field data for accuracy.

## Abstract

The contraction joints within paver runs are important for the design and construction of rigid aircraft pavements. These joints are typically un-doweled and sawn into the pavement to induce a crack. The joints control shrinkage cracking during curing, allow for thermal expansion and contraction, and provide load transfer through aggregate interlock joint stiffness between adjacent slabs. Aggregate interlock joint stiffness is typically modeled by assigning a spring element between two slabs that is indicative of the stiffness of the joint. However, that simplification may not accurately represent the complex interaction of irregularly shaped concrete faces and joint openings. Consequently, previous researchers have recommended modelling aggregate interlock stiffness based on physical crack shape. This research uses a novel approach to characterize crack shape through an idealized two-dimensional sinusoidal shape. Once the crack shape was defined, finite element methods were used to determine the significance of load, sublayer, and crack shape factors on load transfer values. It was determined that joint opening was the most significant factor for aggregate interlock load transfer. Future research is recommended to further validate the model against a larger data set, to confirm if the two-dimensional idealization of crack shape is an appropriate estimation of field conditions.