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<br />Longitudinal Structural System (Spine) <br />As a result of our initial screening of superstructure systems, we propose a main spine of three redundant <br />prestressed 72-inch FUBs tied together by diaphragms. An 8-inch concrete slab will be cast-in-place and <br />made composite to increase bending and torsional stiffness. <br />Benefits of 72-inch FUB superstructure spine include: <br /> <br />Internal Redundancy <br />Fully bonded prestressing beams are internally redundant, that is, <br />partial damage to the bottom flange of the FUB does not result in <br />a collapse of the beam. <br /> <br />External Redundancy <br />Three FUB beams connected with internal and external <br />diaphragms create an externally redundant structural system. <br />This means there are multiple load paths to prevent a collapse if <br />a member fails. <br /> Torsional Resistance Box section with composite deck efficiently carries torsional loads <br />from cantilever brackets. <br /> <br />Category 1 System <br />Use of FDOT Standards and redundancy of the FUB system meets <br />the criteria to be a FDOT Category 1 system. Prior to the 2020 <br />FDM updates this system would not have required a Peer Review <br />and will provide FDOT reviewers with a high level of comfort. <br /> <br />FDOT Standard System <br />FUBs are detailed in the FDOT Standard Plans and have been <br />developed for harsh environments and highway loadings. FDOT <br />reviewers will be familiar with the necessary design calculations. <br />Fabricators and contractors will be able to provide consistent <br />pricing since elements and construction techniques are <br />conventional. <br /> <br />Erection <br />FUBs are shipped and erected in one piece and can carry dead and <br />construction loadings without any additional post-tensioning <br />operations at the site. <br /> <br />Inspection <br />Relative to a post-tensioned system, FUBs are simpler to inspect <br />since there are no grout filled ducts with potential for water <br />infiltration or interior cable systems. <br /> <br />Durability <br />Continuously bonded prestressed strands pre-compress the <br />concrete which improves durability by minimizing cracks in the <br />extremely corrosive oceanfront environment. <br /> <br />Aesthetics FUB provides a smooth base with minimal visual clutter. <br /> <br /> <br />D-14