TOMORROW'S ROADS TODAY - Maryland State Highway ...

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62 Appendix C: Highway and Bridge Terms and Definitions Annual Average Daily Traffic (AADT) - The total volume passing a point or segment of a highway facility in both directions for one year, divided by the number of days in the year. Abutment -A retaining wall supporting the ends of a bridge or viaduct. American Association of State Highway and Transportation Officials (AASHTO) - AASHTO is a nonprofit, nonpartisan association representing highway and transportation departments. Its guides and specifications are used to describe loading requirements for highway (vehicular) bridges. Formerly known as American Association of State Highway Officials (AASHO) Anchor Span - Located at the outermost end, it counterbalances the arm of a span extending in the opposite direction from a major point of support. Often attached to an abutment. Anchorage Block - Located at the outermost ends, the part of a suspension bridge to which the cables are attached. Similar in location to an abutment of a beam bridge. Approach - The part of the bridge that carries traffic from the land to the main parts of the bridge. Approach Span - The span or spans connecting the abutment with the main span or spans. Aqueduct - A pipe or channel, open or enclosed, that carries water. May also be used as part of a canal
63 to carry boats. Sometimes carried by a bridge. Arch - A typically curved structural member spanning an opening and serving as a support. Arch Bridge - A bridge whose main support structure is an arch. Additionally, the bridge may be termed a through arch, which is simply one where the roadway appears to go through the arch. Arch Barrel - The inner surface of an arch extending the full width of the structure. Awards - Projects authorized to proceed with construction after bids have been received and accepted by the authorizing transportation agency. Bascule Bridge - From the French word for "see-saw," a bascule bridge features a movable span (leaf) that rotates on a horizontal hinged axis (trunnion) to raise one end vertically. A large counterweight is used to offset the weight of the raised leaf. May have a single raising leaf or two that meet in the center when closed. Beam - A horizontal structure member supporting vertical loads by resisting bending. A girder is a larger beam, especially when made of multiple plates. Deeper, longer members are created by using trusses. Beam Bridge - A bridge built of beams, either classified as a short-span or long-span beam bridge, which is supported on beams whose ends rest on piers or abutments. Bearing - A device at the ends of beams that is placed on top of a pier or abutment. The ends of the beam rest on the bearing.
Page 1 and 2:
"TOIORROW'S ROADS TODAY" EXPRESSWAY
Page 3 and 4:
3 SHA identified 286 highway bridge
Page 5 and 6:
5 Table of Figures Figure 1: US 40
Page 7 and 8:
7 Until 1941, Maryland did not have
Page 9 and 10:
9 plate metal girder bridges. The n
Page 11 and 12: 11 Epigraph “Tomorrow’s Roads T
Page 13 and 14: 13 after 1965. Those developments h
Page 15 and 16: 15 Figure 1: US 40 over the Patapsc
Page 17 and 18: 17 State Struggles The SRC also pro
Page 19 and 20: 19 As the SRC finalized the bridges
Page 21 and 22: 21 This central shore location was
Page 23 and 24: 23 William Preston Lane, Jr. and th
Page 25 and 26: 25 The BPR and National Park Servic
Page 27 and 28: 27 project. The highway bonds sold
Page 29 and 30: 29 highways that connected county s
Page 31 and 32: 31 Figure 10: I-695 at Dulaney Vall
Page 33 and 34: 33 Figure 12: Atomic Energy Commiss
Page 35 and 36: 35 Federal Aid Highway Act of 1956
Page 37 and 38: 37 Maryland continued to apply for
Page 39 and 40: 39 SRC expanded the road to a four-
Page 41 and 42: 41 completion of the two interchang
Page 43 and 44: 43 Figure 17: Governor Elbert N. Ca
Page 45 and 46: 45 Each of these bridges provides u
Page 47 and 48: 47 Bibliography American Associatio
Page 49 and 50: 49 Maryland-National Capital Park a
Page 51 and 52: 51 ____________, Report of the Stat
Page 53 and 54: 53 Appendix A: Results of Field Inv
Page 55 and 56: 55 Steel Deck Truss - similar to St
Page 57 and 58: 57 Concrete Encased Steel Beam, SHA
Page 59 and 60: 59 or Bethlehem Steel types would b
Page 61: 61 Eligible Bridges The following b
Page 65 and 66: 65 Bridge Condition Ratings - Throu
Page 67 and 68: 67 to the arch below. The first arc
Page 69 and 70: 69 Deck Bridge - A bridge in which
Page 71 and 72: 71 Embankment - Angled grading of t
Page 73 and 74: 73 Girder - A horizontal structure
Page 75 and 76: 75 Headwall - The device placed at
Page 77 and 78: 77 Lag - Crosspieces used to connec
Page 79 and 80: 79 Parapet - A low wall along the o
Page 81 and 82: 81 of multiple members of a truss.
Page 83 and 84: 83 Spandrel - The roughly triangula
Page 85 and 86: 85 Swing Bridge - A movable deck br
Page 87 and 88: 87 Unit Stress - The stress per uni
Page 89 and 90: Appendix D: SHA Bridges Included in
Page 91 and 92: 91 Eligibility Description Bridge N
Page 101 and 102: 101 Eligibility Description Bridge
Page 103: Appendix E: Resume Anne E. Bruder i
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