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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 <br />Redundancy <br />Fully bonded prestressing beams are internally redundant, that is, partial <br />damage to the bottom flange of the FUB does not result in a collapse of the <br />beam. <br /> <br />External <br />Redundancy <br />Three FUB beams connected with internal and external diaphragms create an <br />externally redundant structural system. This means there are multiple load <br />paths to prevent a collapse if a member fails. <br /> <br />Torsional <br />Resistance <br />Box section with composite deck efficiently carries torsional loads from <br />cantilever brackets. <br /> <br />Category 1 <br />System <br />Use of FDOT Standards and redundancy of the FUB system meets the criteria <br />to be a FDOT Category 1 system. Prior to the 2020 FDM updates this system <br />would not have required an Independent Peer Review and will provide FDOT <br />reviewers with a high level of comfort. In contrast, a segmental post-tensioned <br />system or steel box would have been considered a Category 2 System. <br /> <br />FDOT <br />Standard <br />System <br />FUBs are detailed in the FDOT Standard Plans and have been developed for <br />harsh environments and highway loadings. FDOT reviewers will be familiar with <br />the necessary design calculations. Fabricators and contractors will be able to <br />provide consistent pricing since elements and construction techniques are <br />conventional. <br /> <br />Erection FUBs are shipped and erected in one piece and can carry dead and construction <br />loadings without any additional post-tensioning operations at the site. <br /> <br />Inspection <br />Relative to a post-tensioned system, FUBs are simpler to inspect since there are <br />no grout filled ducts with potential for water infiltration or interior cable <br />systems. Unlike steel girders the inside of FUBs do not need to be inspected <br />eliminating access, lighting, and ventilation elements which would need to be <br />maintained. <br /> <br />Durability <br />Continuously bonded prestressed strands pre-compress the concrete which <br />improves durability by minimizing cracks in the extremely corrosive oceanfront <br />environment. Prestressed beams eliminate the need for costly painting and <br />maintenance of steel girders. <br /> <br />Aesthetics FUB provides a smooth base with minimal visual clutter.