Tappan Zee Hudson River Crossing

Hinman is the blast and fire consultant for The New NY Bridge led by the Tappan Zee Constructors, which includes American Bridge, Fluor, HDR, Buckland & Taylor, URS and GZA.

This replacement bridge project, originally estimated to cost $5.2 Billion by the New York State Thruway Authority, was won with a highly innovative design that allowed the team to win with a reduce a bid of $3.4 Billion, which was $800 Million less than the next lowest bid submitted. Hinman help to contribute to this savings during the proposal phase by limiting the hardening to only those key structural elements that prevent catastrophe collapse. Our analysis was performed using our in-house stochastic cost-benefit model.

Hinman’s contribution included analytical verification of structural damage for over two dozen explosive threats.

Hinman is part of the preconstruction team led by HDR for this project. The team has just completed the Accident Threat Vulnerability Risk Assessment (ATVRA) portion of the work with the assistance of experts from government and the project peer reviewers HNTB and Arup. Hinman’s contribution included analytical verification of structural damage for over two dozen explosive threats.

Of particular note, Hinman evaluated the structural response of the bridge for fire threats. Our analysis had unexpected results which were supported by the project peer reviewers and potentially will change the standard of protection for bridges in the New York Area and across the nation.

Hinman will continue working with the preconstruction team during the next phase of work to develop the mitigation design for the bridge.