Pedestrian and Cycling Bridge in Neckartenzlingen, Germany
Town of Neckartenzlingen, Germany
|Building and Structural Planning||
Miebach Engineering Office
Blankenhorn Engineering Office
Gottlob Brodbeck GmbH & Co. KG
Schaffitzel Holzindustrie GmbH + Co. KG
Schwäbisch Hall, Germany
The S‑shaped pedestrian and cycling bridge with the straight middle section across the Neckar river in Neckartenzlingen, Germany, has a total length of 96.30 m and a width of 3.00 m.
Both foreland areas are bent in the ground plan and have a radius of approximately 65.25 m. In this way, the course of access roads is considered in the ground plan.
The bridge superstructure consists of two stepped glued‑laminated timber beams coupled to each other and drilled to blocks. It spans three bays with the individual spans of about 25.90 m / 44.50 m / 25.90 m and a total length of 96.30 m of the Neckar river.
For efficient material utilisation, the cross‑section height is graduated from 80 cm up to 208 cm according to the loading. Due to the continuous structure, zero moment distributions result in the main bay. These were modelled as articulated joints. In this way, a reasonable transport size and a simplified assembly of the wooden structural elements were achieved.
The supporting structure is optimally protected from weather conditions by its geometry (lateral stepping) and the top cover made from precast concrete panels (with lateral overhang, drainage channels below the structural joints and an additional sealing level on the timber beams). In order to verify these wood protection assumptions, a moisture monitoring system was arranged in the area of the highest cross‑section.
The substructure consists of reinforced concrete abutments with a bored pile foundation as well as the intermediate supports comprised of reinforced concrete columns built on shallow foundations. In the bridge structure extension, the path continues to a ramp with a throughed supporting structure made of reinforced concrete.
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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
Timber design according to Eurocode 5, SIA 265 and/or DIN 1052
Design of steel members according to Eurocode 3
Dynamic analysis of natural frequencies and mode shapes of member, surface, and solid models
Dynamic and seismic analysis including time history analysis and multi-modal response spectrum analysis
Design of reinforced concrete members and surfaces (plates, walls, planar structures, shells)