Investigation of Cracks Observed on a Skewed Bridge Constructed Using Self-Propelled Modular Transporters

Abstract

This study investigates full-depth deck cracks observed on a skewed bridge, which was constructed using self-propelled modular transporters (SPMTs). To investigate the causes, three main factors associated with structural design, material design, and construction are reviewed. Specifically, the bridge performance under thermal and construction loading is investigated by conducting a nonlinear finite-element analysis. The analysis parameters include bridge deck geometry, boundary conditions, bearing details, and skew angles. The loading conditions mainly include thermal and differential deck movements induced during an SPMT move. The results are compared to a crack map created from two site visits. It is concluded that skewed decks are more susceptible to cracking than straight decks due to an asymmetric expansion and contraction. Additionally, semi-integral abutment designs in a skewed bridge increase the extent of cracking in the skewed corners of the abutment ends. It is recommended that a semi-integral abutment design be carefully considered when designing a skewed bridge and that bearing and expansion joint details need careful attention for accelerated bridge construction.