Bicyclists- and pedestrians bridge Wetteren Ingenieursbureau STENDESS N.V. Grote Baan 18 9920 Lovendegem Belgium Tel.: +32 9 370 71 25 Fax: +32 9 372 43 95 Contact: ir. Geert Goethals; ir. Jurn De Vleeschauwer Email: [email protected] Website: www.stendess.com A steel and concrete engineering company Stendess can vouch for the total stability analysis of projects. Our approach covers the initial study trough to the end project. With its in-house know-how in steel as well as concrete, the firm is able to offer full study pack-ages for both materials. Thanks to its accumulated know-how and its advanced infrastructure, Stendess can follow up on cross-border projects in accordance with most standards and codes: Eurocode, NBN, NEN, DIN, NF, AISC, British Stan-dards and specific national codes. Key activities • Industrial buildings: steel factories, power plants, depots, etc, • Other buildings: service buildings, concert halls, sport facilities, swimming pools, apartment buildings, • Bridge construction: all types of bridges • Off-shore projects: lock gates, Roro, oil rigs, … • Industrial equipment: silos, cranes, crane ways • Erection engineering: longitudinal and transverse repositioning, skidding, hoisting,… Type: Arched bridge Location: Highway E40, 9230 Wetteren, Belgium Owner: Ministerie van de Vlaamse Gemeenschap; Afdeling Wegen en Verkeer Oost-Vlaanderen, Zwijnaarde Belgium Architect: Ministerie van de Vlaamse Gemeenschap; Afdeling metaalstructuren, Brussels, Belgium Engineering office: Ingenieursbureau STENDESS N.V., Lovendegem, Belgium Contractor: Metaalconstructie Aelterman B.V.B.A., Destelbergen, Belgium Total steel weight: ± 200 tons Total length: 105 m; bowstring l = 75 m Highest point: ± 20 m (top of arches) Building period: 2003 Short description of the project The construction of a roundabout for the N42 above the E40, with its numerous connections with approaches and exits, created for bicyclists and pedestrians a dangerous situation. It was decided to build a separate bicyclist and pedestrian bridge at the west side of the floating roundabout. Thanks to the building of this bridge the cyclist traffic has been completely separated from the road traffic. For the engineering of the bridge, the condition was set that the construction of the bridge should cause a minor problems for the traffic on the highway E40. The land abutments could be planted in the talus. The zone between the exit and the motorway, direction Brus-sels, was wide enough to build a pile. This configuration led to two spans of 30 m and 75 m respectively. For the main span an arched bridge with open falling arches was chosen and for the road deck an orthotropic steel deck. The whole bridge was completely preassembled in the workshop, so that the assembly on the spot could be done smoothly. There were only 8 hours of traffic interruption foreseen. The main span, this is the bowstring part, was assembled along the highway. In one night the 180 tons weighing arched bridge was turned over 90 ° with cranes and rollers into the right place. In this work of art the greatest characters of steel came clearly to their right: the slim line and the playful form of the construction, speed of assembly and the limited traffic interruption, the minor construction height for the great spans, … Use of ESA-Prima Win Description of technical questions solved by means of ESA-Prima Win Both, for the dimensioning of the bridge in the traffic situation and the erection engineering of the bridge, ESA-Prima Win was used. The complete 3D-model was formed with bars, the orthotropic deck plate was put together as 2D-elements, with the purpose of creating the real lateral stiffness of the bridge. This was necessary because of the very light and slender character of the main girders and the arches. For the calculation with regard to the traffic situation each bridge member was given a buckling factor based on the rules of EC3. The beam check was then made by EC3 steel check of ESA-Prima Win. The buckling control of the arches was done in three ways. The first method was done with EC3-steel check of ESA-Prima Win. The second method was based on the calculation of the axial critical buckling force, which was compared with the max. calculated axial force by ESA-Prima Win. The third method was done by using the stability check of ESAPrima Win in which a sinusoidal pre-deformation was given for the arches. The tension bars, which support the deck, were simulated as classic bars, but with the E-modulus of the tension bar material in relation to the inclination of the tension bars (this means they were considered as cables 84 Company Project Bicyclists- and pedestrians bridge Wetteren SCIA User Contest 2005 / Civil Engineering 2 Categorie
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