By Ioannis Vayas
''The booklet is aimed toward scholars, particularly at MSc point, and working towards engineers who have to familiarize yourself with the recent layout principles integrated within the EN-versions of the Eurocodes. Its concentration is especially on street bridges, even if a few details is equipped for railway bridges. fabric is gifted in a concise manner''--
''Preface Bridges have a powerful symbolism as they attach contrary aspects. it isn't a twist of fate that bridges are illustrated on one facet of Euros. for lots of engineers, bridge layout assumes best precedence of their perform. in truth, the layout of the optimum, technical, cost effective, and aesthetical resolution with latest instruments and capability is a problem for any structural engineer. overseas most sensible practices express that the hunt for substitute strategies and the alternative of the optimum one are crucial for the development of a profitable bridge. the standards for choice can be ruled via technical, cost-effective, operational, aesthetical, and environmental concerns and should be the alternative of both the landlord, the contractor, the fashion designer, or the consumer. consequently, bridge development builds a fit festival as regards structural forms, building fabrics, development tools, and different parameters that lead to a polymorphy of bridges. In a few features, bridges mirror the technological improvement in a interval or in a rustic. one of the forms of bridges, composite bridges have an important position, as the mix of the commonest building fabrics, metal and bolstered concrete, permits the development of secure, operational, sturdy, and powerful bridges economically''-- Read more...
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Additional resources for Design of steel-concrete composite bridges to Eurocodes
15. Steel girders rigidly connected through shear studs with thin precast slabs 100–120 mm can be fabricated in factory. Obviously, the connected precast slabs serve as formworks for the in situ concrete supplement and stabilize the steel girders, thus eliminating the use of intermediate bracings. Prefabricated girders with a maximum length of 60 m can be transported by road and lifted into place by using mobile cranes. Girders with a length of 80 m can be transported by water. During the last 15 years, partially prefabricated composite girders are implemented in Germany with great success.
Hogging bending moments due to permanent loading, creep, and shrinkage are significantly reduced; the bridge maintains its static indeterminacy, and cracking of concrete is easier controlled. In situ deck concreting allows different slabs’ shapes. 5. Slabs with uniform thickness (case A) are, from a constructional point of view, the easiest ones, and they are mainly chosen for short-span straight bridges with decks narrower than 7 or 8 m. Thicknesses from 220 to 250 mm are commonly preferred. 4 Construction sequence for controlling cracking in a continuous bridge.
Torsion is followed by an out-of-plane deformation of the section (distortion) that is associated with an interaction between shear and normal stresses. The previous stress situation is known as warping and can result in unexpected failure modes during erection and the final stage; such failure modes can be plate buckling at serviceability limit state (SLS), weld ruptures due to fatigue at welds, and local yielding of structural steel at unexpected positions. Thus, a detailed investigation for appropriate internal stiffening that prevents excessive distortional effects and high warping stresses should be conducted.
Design of steel-concrete composite bridges to Eurocodes by Ioannis Vayas