Steel Box Beam Bridge

The box girder normally comprises prestressed concrete structural steel or a composite of steel and reinforced concrete the box is typically rectangular or trapezoidal in cross section box girder bridges are commonly used for highway flyovers and for modern elevated.

Steel box beam bridge. A box girder also known as a tubular girder is a bridge in which the main beams comprise girders in the shape of a hollow box. Steel box girders and steel and concrete composite box girders are used for long spans where the self weight of the bridge needs to be minimized and for situations where their excellent high torsional stiffness is of particular benefit. Box girders comprise two webs that are joined top and bottom by a common flange creating a closed cell that offers very good torsional stiffness which may be required on highly curved bridges in beam and slab bridges box girders are an alternative to plate girders at the upper end of the span range where they offer a lower steel weight although this has to be balanced. A beam or girder bridge is the simplest kind of bridge.

When concrete barrier transitions are located on the bridge deck a plan view beams. A box girder bridge or box section bridge is a bridge in which the main beams comprise girders in the shape of a hollow box. For box beam reinforcement see bd pc7e. The box girder normally comprises either prestressed concrete structural steel or a composite of steel and reinforced concrete.

Compared to an i beam the advantage of a box girder is that it better resists torsion having multiple vertical webs it can also carry more. In the past they may have taken the form of a log across a stream but today they are more familiar to us large box steel girder bridges. Detailing barrier bars in the beam shall be shown. Bridge type notes the type of superstructure for the given bridge.

The bridge types were then separated and resulted in the following. There are lots of different types of beam bridges. A box or tubular girder is a girder that forms an enclosed tube with multiple walls as opposed to an i or h beam originally constructed of riveted wrought iron they are now made of rolled or welded steel aluminium extrusions or prestressed concrete. A beam bridge needs to be stiff.

Details are similar for slab units and for bridges with other skews. The clean lines of box girders bridges usually with no visible external stiffening is generally considered to give a excellent appearance and durability.