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Pages 246-257

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From page 246...
... 246 Agency Survey Results A survey of four state DOTs from each of the four AASHTO regions was performed in September and October 2020 to identify key aspects and trends of deck overhang design to inform the proceeding analytical and testing programs (Figure 355)
From page 247...
... Agency Survey Results 247   State Concrete Steel Timber Other CA 85 2 2 11 DE 100 0 0 0 FL 99 1 0 0 IL 98 1 1 0 IN 100 0 0 0 LA 88 2 10 0 MA 83 2 1 14 MN 100 0 0 0 NE 100 0 0 0 NJ 95 5 0 0 NY 53 5 7 35 OH 72 1 1 26 SC 100 0 0 0 TX 100 0 0 0 VA 100 0 0 0 WA 75 20 5 0 1 CA other: segmental construction. 2 MA other: historic bridges not tracked in inventory system.
From page 248...
... 248 MASH Railing Load Requirements for Bridge Deck Overhang CA 2 12 4 2 10 4.5 DE 1 3.75 NA 1 3.75 NA FL 3 4.5 3.5 3 4.5 3.5 IL 1.75 4.5 3.25 1.75 4.25 3.25 IN 1.5 3 2 2 4 2.5 LA 3.5 5 4 3.5 5 4 MA 1.67 3 3 2 3 2.5 MN 0.5 6 3.25 0.5 6 3.25 NE 0.67 3.5 3.5 0.67 4.5 NA NJ NA NA NA 2.5 4.5 2.5 NY NA NA NA 2 4 NA OH 1.5 4 2.5 1.5 4 4 SC 2.25 4.5 3.25 2.25 4.5 3.25 TX 0.5 6 3 0.5 4.5 3 VA 1.5 3 3 1.5 3 3 WA 3 6 4 3 6 4 Table 23. Deck overhang widths.
From page 249...
... Agency Survey Results 249   girders. The Texas DOT uses the AASHTO LRFD BDS, Article 4.6.2.1.6 to determine the critical section of the fascia girder.
From page 250...
... 250 MASH Railing Load Requirements for Bridge Deck Overhang State Supporting element type Monolithic Concrete 1 Concrete Box Precast Girder Steel I-Beam Steel Box Steel Tub Timber CA DE FL IL IN LA MA MN NE NJ NY OH SC TX VA WA 1 Deck overhang and fascia girder cast in the same pour. CA 7 9 8 8 9 8.5 DE 8.5 8.5 8.5 8.5 8.5 8.5 FL 7.5 8 7.5 8 8 8 IL 8 9.5 9 9.5 9.5 9.5 IN 8 12 9 8 12 9 LA 8 9 8 8 9 8 MA 9 11 9.5 9 11 9.5 MN 7 10 8.5 9 11.25 9 NE 6.5 7.5 7 8 8 8 NJ NA NA NA 8.5 10 NA NY NA NA NA 11.5 12.5 11.5 OH 10.5 12.5 10.5 10.5 12.5 10.5 SC 6.5 12 8 8 14 8 TX 6 12 8 8.5 12 8.5 VA 7.5 9 8 7.5 9 8 WA 7 7 7 7 7 7 Overhang thicknesses shown correspond to the deck thickness at the field edge of the overhang.
From page 251...
... Agency Survey Results 251   Figure 357. Deck overhang thicknesses (current practice)
From page 252...
... 252 MASH Railing Load Requirements for Bridge Deck Overhang CA 20 9 9–12 2–5 DE 10 6 4–8 3–9 FL 20 6 6–9 2–3 IL 10 8 8 5–7 IN 15 8 8–12 2–8 LA 20 10 6–10 2–6 MA 100 8 8–12 2–6 MN 37 6 6–10 1–17 NE 0 NA NA NA NJ 70 6 6–9 1.6–6 NY 49 6 6 5–6 OH 12 8 8–10 1–5 SC 33 6 6–10 5–17 TX Unknown 6 6–18 6–7 VA Unknown 6 6–10 > 6 WA 10 6 6 3–6 Table 27. Brush curb and elevated sidewalk dimensions.
From page 253...
... Agency Survey Results 253   demonstrated in Figure 358 in which average shares are shown as bars and maximum state shares are shown as brackets. Percentages of state bridge rail inventories by rail type are shown in Table 29.
From page 254...
... 254 MASH Railing Load Requirements for Bridge Deck Overhang inventory shares of 9% and 7%, respectively. Hybrid post-and-beam made up an average inventory share of 7%, while deformable guardrail-style and timber bridge rails are very uncommon, with average state inventory shares of 2% and 0.4%, respectively.
From page 255...
... Agency Survey Results 255   of the sixteen surveyed states use crash testing to determine the adequacy of bridge deck overhangs. Ten of the states indicated that their state DOT bridge design manual contains deck overhang design information not contained in the AASHTO LRFD BDS and therefore significantly guides the overhang design procedure.
From page 256...
... 256 MASH Railing Load Requirements for Bridge Deck Overhang In-Service Performance While eleven of the surveyed states indicated that significant in-service bridge rail damage has been observed, only one state noted one case of significant in-service deck overhang damage. Moreover, for each case in which significant in-service bridge rail damage was noted, this behavior was rare.
From page 257...
... Agency Survey Results 257   use epoxy or grouting to install new bridge rails on existing deck overhangs. Two states indicated that thrie beam is occasionally attached to bridge rails to improve crashworthiness.

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