Structural Engineering Slide Library

Two-hinged arches

	Image-GoddenB34 Detail of Washington Traffic Bridge (see GoddenB27) showing the abutment hinges. There is no mid-span hinge in this bridge. (New York City)
	Image-GoddenB35 Findhorn Arch Bridge. Designed as a 2-hinged steel arch. Section of the arch rib is a variable depth plate girder. Abutment hinge detail shown in GoddenB36. (Scotland)
	Image-GoddenB36 Findhorn Arch Bridge. Detail of abutment hinge in the structure in GoddenB35. Hinge consists of steel pin and cast steel pedestals. Note that the orientation of the bearing is in-line with the arch axis. (Scotland)
	Image-GoddenB37 Tyne Bridge. This 531-ft span 2-hinged arch bridge was opened in 1930. The arch ribs are variable depth warren girders. For abutment hinge detail, see GoddenB38. (Newcastle, England.)
	Image-GoddenB38 Tyne Bridge, detail. Abutment hinge consists of a steel pin. 12 in diameter and 8 ft 5 in long. Thrust on the pin is 2900 tons. (Newcastle, England.)
	Image-GoddenB39 Grosvenor Bridge over the River Thames. Example of a multi-rib 2-hinged arch bridge. Ribs are steel box sections painted white. (London, England)
	Image-GoddenB40 Grosvenor Bridge over the River Thames. Detail of end abutment hinges. (London, England.)
	Image-GoddenB41 Passerelle Debilly, River Seine. This 2-hinged footbridge develops horizontal tension in the road-level girders, as the side-span arch ribs are connected to these girders at the ends of the bridge. It can also be classified as a tied-arch bridge. Detail of pier support and end support are shown in GoddenB42-B43. (Paris, France)
	Image-GoddenB42 Passerelle Debilly, River Seine. Detail of near pier support. (Paris, France)
	Image-GoddenB43 Passerelle Debilly, River Seine. Detail of end support. The vertical column is a long expansion linkage. Both the side-span arch rib and the end of the road-level girder are attached to the top of the linkage. (Paris, France)
	Image-GoddenB43.1 Yaquina Bay Bridge (1936), Newport, Oregon. This multi-span bridge at the mouth of the Yaquina River consists of a series of concrete arch spans (foreground), and three steel truss arch spans. In the long span, over the main channel, the truss arch rises above road level. The truss arches are two-hinged, there being no continuity of action between the adjacent arches at the supports. Total length of bridge, 3280 ft. (Newport, Oregon)
	Image-GoddenB43.2 Close-up of the truss spans in the Yaquina Bay Bridge. Note the details of the bracing in and between arch trusses, also the pinned support at the far end of the nearest arch. See also GoddenB43.1. (Newport, Oregon)
	Image-GoddenB43.3 Fremont Bridge (1973) over the Willamette River, Portland, Oregon. Two-hinged parabolic arch system, with the ends of the side arches tied to the continuous 18-ft deep plate girder at road level which provides the flexural stiffening. Note that the main arch and side-span arches are continuous at the supports, unlike the footbridge of GoddenB41 and GoddenB42. Main span between supports is 1255 ft., side spans are 448 ft. The roadway is 170 ft. above the river. Arch ribs are tied together transversely with K-bracing. The 902-ft. length of the main span where the arch is above the girder was constructed off site and its 6000-ton weight floated on the river and lifted into position. (Portland, Oregon)
	Image-GoddenB43.4 Two-pinned steel arch bridge (1985) built as replacement for an older and narrower overcrossing bridge on route I-5 near Olympia, Washington. The previous concrete bridge, which can be seen inside the new arch structure under construction, consisted of columns and beams. Part of the reason for the replacement was to remove the columns and widen the main road. This was done without interfering with the flow of traffic on the overpass. The new steel box girder arch has been constructed around the previous bridge. (Near Olympia, Washington)
	Image-GoddenB43.5 Close-up of the two-pinned steel arch bridge (1985) near Olympia, Washington. Shows construction of the new bridge around the old one. See also GoddenB43.4. (Near Olympia, Washington)
	Image-GoddenB43.6 Two-pinned steel arch bridge near Olympia, Washington. Detail of the arch pinned support. See also GoddenB43.4 and GoddenB43.5. (Near Olympia, Washington)
	Image-GoddenB43.7 Two-pinned steel arch bridge near Olympia, Washington. Bridge was completed after removing the old structure, accommodating a widened highway. See also GoddenB43.4. (Olympia, Washington)
	Image-GoddenB43.8 Cold Springs Canyon Bridge. This 1200 ft. steel highway bridge is constructed of two 2-pinned arch ribs, horizontally braced by K-bracing. The spandrel columns are pinned at both ends (see GoddenF36) and the overall system bending stiffness is primarily in the arch ribs. (Santa Barbara, California)
	Image-GoddenB43.9 Cold Springs Canyon Bridge. Detail of the transverse K-bracing between arch ribs in the structure in GoddenB43.8. (Near Santa Barbara, California)

Set B: Arch Structures