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Nail-laminated timber deck bridges represent an economical and convenient solution for rural low-volume roads, but a need exists to develop effective railing systems for this type of roadway structure. This paper describes the development of two bridge railings that are specifically designed for transverse nail-laminated timber deck bridges and tha...
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Citations
... In 2009, MwRSF researchers, in cooperation with the WVDOT, developed a low-height, glulam timber bridge railing system that satisfied Test Level 1 (TL-1) impact conditions found in the American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (AASHTO 2009). This system was successfully crash tested on a transverse, nail-laminated deck (Rosenbaugh et al. 2009, Mongiardini et al. 2011, as shown in Figure 1. The recently issued AASHTO MASH (AASHTO 2016) incorporates six test levels (TL-1 through TL-6). ...
This study undertook the adaptation of two bridge railings to meet current impact safety standards for use on low-volume roads. The first bridge railing, a reinforced concrete (RC) system crash-tested in 2002, was modified to comply with the American Association of State Highway and Transportation Officials (AASHTO's) Manual for Assessing Safety Hardware (MASH) Test Level 1 (TL-1) impact standards, with attention given to minimizing construction costs and space requirements. Key adaptations included a reduced barrier width and alterations to the steel reinforcement that maintained MASH TL-2 structural capacity with a TL-1 height. Design variations explored deck thicknesses (152 to 254 mm), overhang lengths (305 to 1,524 mm), and single or dual layers of deck steel, considering three design load cases aligned with two extreme event limit states and one strength limit state. The second bridge railing, an AASHTO MASH TL-1 low-height, glue-laminated (glulam) timber system, initially crash-tested in 2009 for a transverse, nail-laminated (nail-lam) deck, underwent similar modifications. Static and dynamic component tests were performed to adapt the bridge railing to a transverse glulam deck. Test results showed the railing on the glulam deck outperformed the nail-lam counterpart, demonstrating higher lateral resistance, greater energy absorption, and increased initial linear stiffness. Therefore, the railing on the transverse glulam deck demonstrated a safety performance equal to or exceeding the original design and was deemed suitable for MASH TL-1 conditions.
... Nail-laminated timber (NLT) is one of the mass timber products, which is constructed by nailing laminas side-by-side. NLT has been applied in timber decks and floors [1]. The existing research on NLT mostly focus on its bending performance. ...
