By D.C. Iles
This ebook enhances prior layout courses for the layout of composite bridges according to the Eurocodes. It recognises that many street bridges hold roads which are on a curved alignment and the aiding constitution follows that curved alignment. The assistance addresses the implications of the plan curvature at the design.
The booklet discusses
The strategies of utilizing a chain of hetero girder lengths (chords to a curve) and of utilizing curved girders.
The behaviour of curved parts, noting the torsional results that come up, and the applying of the Eurocodes to events that aren't consistently explicitly coated by means of its rules.
Consequences for building (noting that the fabrication of curved girders is quickly available in sleek workshops) and the choices for bridge articulation.
A brief labored instance illustrates the applying of layout principles to a two-span bridge, just like the examples in e-book P357 yet curved in plan.
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Additional resources for Design of Composite Highway Bridges Curved in Plan
Sample text
The effects of lateral bending of the bottom flanges need to be included in that determination. The fatigue details that will experience enhanced stress due to lateral bending effects are clearly those where there are attachments to the flange (stiffeners and bearing plates), transverse butt welds and bolted splices. 26 27 Serviceability considerations The most commonly experienced criterion at the serviceability limit state (SLS) is the limitation of elastically determined stresses to the yield strength of steel, although this usually only arises when plastic resistance is utilized at ultimate limit state.
For multi-girder bridges, it is preferable to lift girders in braced pairs, to minimise twist after erection. The connection of pairs of girders usually needs to take place before transportation, as there is unlikely to be any suitable facility to do so on site (unless the site is large and well equipped for steelwork assembly). For ladder deck bridges, girders can only be transported and erected singly (except where preassembly on site is possible and very large cranes are available). The long and heavy girders will twist significantly before the cross girders are connected and it may be necessary to provide a temporary support at mid-span to reduce the twist.
F. C. Design of steel beams in torsion (P385). SCI, 2011. Guide specifications for horizontally curved steel girder highway bridges 2003 (GHC-4). AASHTO, Washington DC, 2003. R. J. Designers’ guide to EN 1993-2 Eurocode 3: Design of steel structures. Part 2: Steel bridges. Thomas Telford, 2007. C. Determining the buckling resistance of steel and composite bridge structures, (ED006). org). R. C. Steel Bridge Group: Guidance notes on best practice in steel bridge construction (Fifth Issue) (P185).