Pylon Bridge Across Agger River in Lohmar, Germany
Since May 2013, a new S-shaped pylon bridge meanders across the Agger river near Lohmar, a town in West Germany. Due to its curving shape, the bridge reflecting the course of the river is perfectly integrated into the landscape.
Design, Structural and Construction Planning
Schaffitzel+Miebach Faszination Brücken GmbH, Lohmar, Germany
Construction of Superstructure
Schaffitzel Holzindustrie GmbH + Co. KG, Schwäbisch Hall, Germany
City of Lohmar, Germany
However, the main reason for this routing is the hydraulic engineering and design. The longitudinal slope of the bridge girder is 6%, thus wheelchair users are able to pass the bridge without difficulty. Despite the slight slope, the bridge including freeboard lies high above the highwater level.
With a length of exactly 62.32 m, the bridge passes over the 40 m wide river bed. The longitudinal girder is guyed by two steel pylons.
The main beam with a depth of 54 cm and a width of 160 cm is made of block‑glued laminated spruce timber. It consists of five elements that are joined in the secondary beam zones. The individual elements are connected to each other by means of dowels and slotted sheets which are welded to the cross beams.
The bridge has a total width of 2.00 m and is stayed with ties of d=42 mm connected to 13 m high pylons. The horizontal forces caused by the cables are transferred as compressive forces into the main beam. Thus, only vertical forces are introduced into the foundations below the main girder.
The longitudinal girder is covered with natural stone slabs in order to protect the bridge against weathering. Furthermore, its sides are coated with larch wood. All structural steel parts are hot-dip galvanized and colorcoated.
The hand rail of the guard railing is made of glued laminated timber by Accoya. Accoya wood is subjected to compression and heat and is treated with acetic anhydride, so it absorbs significantly less water.
The pylon bridge in Lohmar is arguably one of the most beautiful river bridges that have been built in the region of Cologne/Bonn in Germany.
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Programs Used for Structural Analysis
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements
Design of steel members according to Eurocode 3
Timber design according to Eurocode 5, SIA 265 and/or DIN 1052