High Bridge Manhattan Gatehouse, NY, USA

ODB was involved in the assessment of the structural safety of the 16-foot span brick barrel vault in the Western Gatehouse of the High Bridge in New York City. The vault was significantly distorted at the time of assessment, and the challenge was to understand the cause of the distortion, and to assess the structural significance of the existing cracks and displacements. Lower-bound thrust line analysis and discrete element modelling were used to evaluate safety and recommend remediation measures.