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

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68 immediately beneath the driving surface), and the substructures (foundation and supporting posts and piers). General condition ratings range from 0 (failed condition) to 9 (excellent). Continuous Span Beam Bridge - A simple bridge made by linking one beam bridge to another; some of the longest bridges in the world are continuous span beam bridges. Crown - On road surfaces, where the center is the highest point and the surface slopes downward in opposite directions, assisting in drainage. Also a point at the top of an arch. Culvert - A drain, pipe or channel that allows water to pass under a road, railroad or embankment. Damping - The action of reducing the vibration of an object. This tends to return the vibrating object to its original position. Dead Load - The static load imposed by the weight of materials that make up the bridge structure itself. Debarment - Legally preventing a company or person from participation in bid lettings or construction proceedings. Deck - The roadway portion of a bridge, including shoulders. Most bridge decks are constructed as reinforced concrete slabs, but timber decks are still seen in rural areas and open-grid steel decks are used in some movable bridge designs.
69 Deck Bridge - A bridge in which the supporting members are all beneath the roadway. Deck Plate Girder - A plate girder bridge is a bridge supported by two or more plate girders. The plate girders are typically I-beams made up from separate structural steel plates (rather than rolled as a single cross-section), which are welded (or occasionally bolted or riveted) together to form the vertical web and horizontal flanges of the beam. In some cases, the plate girders may be formed in a Z-shape rather than I-shape. Plate girder bridges are suitable for short to medium spans and may support railroads, highways or other traffic. In the deck-type bridge, a steel or reinforced concrete bridge deck is supported on top of two or more plate girders, and may act compositely with them. Additional beams may span across between the main girders, for example in the form of bridge known as ladder-deck construction. Also, further elements may be attached to provide cross-bracing and prevent the girders from buckling.
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 and 62: 61 Eligible Bridges The following b
Page 63 and 64: 63 to carry boats. Sometimes carrie
Page 65 and 66: 65 Bridge Condition Ratings - Throu
Page 67: 67 to the arch below. The first arc
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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