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

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70 Deck Truss - bridge whose roadway is supported from beneath by a truss. Deck Truss Cantilever Bridge - A cantilever bridge is a bridge built using cantilevers: structures that project horizontally into space, supported on only one end. For small footbridges, the cantilevers may be simple beams; however, large cantilever bridges designed to handle road or rail traffic use trusses built from structural steel, or box girders built from prestressed concrete. A simple cantilever span is formed by two cantilever arms extending from opposite sides of the obstacle to be crossed, meeting at the center. In a common variant, the suspended span, the cantilever arms do not meet in the center; instead, they support a central truss bridge which rests on the ends of the cantilever arms. Deflection - The displacement of a structural member or system under load. Diaphragm - Bracing that spans between the main beams or girders of a bridge or viaduct and assists in the distribution of loads. Diagonal - A sloping structural member of a truss or bracing system. Diversion Channel - A bypass created to divert water around a structure so that construction can take place. Downstream Face - The side of the bridge that is not against the water.
71 Embankment - Angled grading of the ground. End Post - The outward most vertical or angled compression member of a truss. Environmental Impact Statement (EIS) - A comprehensive study of potential social, economic and environmental impacts related to a federally-assisted project. Projects for which an EIS is required are defined in the National Environmental Policy Act of 1969, as amended. Expansion Joint - A meeting point between two parts of a structure that is designed to allow for movement of the parts due to thermal or moisture factors while protecting the parts from damage. Commonly visible on a bridge deck as a hinged or movable connection. Extrados - The outer exposed curve of an arch; defines the lower arc of a spandrel. Eye Bar - A structural member having a long body and an enlarged head at each end. Each head has a hole though which a pin is inserted to connect to other members. Fatigue - Cause of structural deficiencies, usually due to repetitive loading over time. Federal Fiscal Year - October 1 through September 30 of the following year. Federal Highway Administration (FHWA) - The mission of FHWA is to administer the Federal-Aid Highway Program to create the best transportation system in the world for the American people through proactive leadership, innovation, and excellence in service. The FHWA is a part of the United States Department of Transportation and is headquartered in Washington, D.C., with field offices located across the United States. Fill - Earth, stone or other material used to raise the ground level, form an embankment or fill the inside of an abutment, pier or closed spandrel. Fixed Arch - A structure anchored in its position. Compare to hinged arch. Fixed-span Bridge - A bridge without a movable, or draw, span.
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
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7 Until 1941, Maryland did not have
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9 plate metal girder bridges. The n
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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 and 68: 67 to the arch below. The first arc
Page 69: 69 Deck Bridge - A bridge in which
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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