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... - 6 - CHAPTER 2 RESEARCH APPROACH The project was divided into the following two phases: Phase 1 – Tasks 1 to 6 involved a review of relevant practices, literature, existing guidance, and research findings, assembly of data on in-service performance and structural failure modes of various joints for all types of culverts. Activities included field testing and fieldscale laboratory testing of joints in representative culverts, development of preliminary structural design criteria, and analysis conducted using finite element modeling.

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