By Eric B. Williamson, National Research Council (U.S.). Transportation Research Board, National Cooperative Highway Research Program, American Association of State Highway and Transportation Officials, United States. Federal Highway Administration
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Extra info for Blast-resistant highway bridges: design and detailing guidelines
Figure 23 shows the test site prior to one of the detonations. The test setup foundation consisted of a 20-ft × 6-ft × 6-in. smooth-surfaced polymer-fiber reinforced concrete slab reinforced with a 2-ft × 2-ft × 1-in. replaceable steel plate at the charge location (midway between the columns). The columns were anchored by flange plates cast directly into the slab on either side of the charge. Sensitized nitromethane was used as the high explosive material, and non-fragmenting plastic cylindrical containers with a charge diameter-to-height ratio of 1:1 approximated a spherical detonation.
5L). 5D of each support to provide sufficient rebar cage stability and column ductility within these plastic hinge regions. 2L from each support for an elastic column response. However, a blast-loaded column is expected to behave inelastically, causing the deformed shape and effective support conditions to change as a function of time. 15L from each support. To investigate the effects of splice location on the performance of blast-loaded bridge columns, the test program included two different splice configurations: near the base for a typical column or no splice to represent seismic columns.
This manual recommends Grade 60 reinforcement and a minimum of 4,000 psi concrete to provide sufficient reinforcement ductility and concrete strength for structures that need blast resistance, and it does not permit high-strength concrete unless laboratory testing can demonstrate that it has sufficient toughness. Fundamentals of Protective Design for Conventional Weapons provides engineers with useful information regarding the design of hardened structures. Conventional weapons can range from an airblast alone to direct hits from precisionguided cased bombs, and a hardened structure’s primary task is full functionality after a wartime attack.