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Beam bridges are the simplest structural forms for bridge spans supported by an abutment or pier at each end. [1] No moments are transferred throughout the support, hence their structural type is known as simply supported. The simplest beam bridge could be a log (see log bridge), a wood plank, or a stone slab (see clapper bridge) laid
Attempts have been made to increase the safety of bridges with pin and hanger assemblies by adding some form of redundancy to the assembly. Retrofits that add redundancy to pin and hanger assemblies include adding a "catcher's mitt"—a short steel beam attached to the bottom of the cantilevered girder that extends out beneath the suspended girder to "catch" the suspended girder should ...
In a plate girder bridge, 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, in older bridges, 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 ...
Falsework includes temporary support structures for formwork used to mold concrete [1] in the construction of buildings, bridges, and elevated roadways. The British Standards of practice for falsework, BS 5975:2008, defines falsework as "Any temporary structure used to support a permanent structure while it is not self-supporting."
The County Road 557–West Branch Escanaba River Bridge is 75 feet (23 m) in length with a roadway width of 30.1 feet (9.2 m) and a complete structure width of 35.5 feet (10.8 m). [2] The structure is a steel stringer bridge, constructed of rolled I-beams supported simply by straight-walled concrete abutments on each side of the river.
A concrete girder bridge pier during construction prior to installation of the bridge deck and parapets, consisting of multiple angled pylons for support (bottom), a horizontal concrete cap (center), and girders (top) with temporary wood bracing. The substructure is made of multiple parts as well:
The South Dakota Dept. of Transportation Bridge No. 30-257-400 is a historic bridge in rural Hand County, South Dakota. It is located 14 miles (23 km) south of Miller and 9.7 miles (15.6 km) east, and carries a local road over Sand Creek. The bridge is a single-span steel beam stringer bridge, resting on I-beam pile abutments with concrete ...
A trestle bridge is a bridge composed of a number of short spans supported by closely spaced frames. A trestle (sometimes tressel) is a rigid frame used as a support, historically a tripod used to support a stool or a pair of isosceles triangles joined at their apices by a plank or beam such as the support structure for a trestle table .