Design and Planning of Pedestrian Bridge Made of TRC
Author: Abraham Brew-Sam, Germany
Dresden University of Technology (TU Dresden)
Advisors: Prof. Dr.-Ing. E.h. Manfred Curbach, Dr.-Ing. Herald Michler
Programs used: RFEM
TRC (Textile reinforced concrete) is a material that seems to mimic some of the problems faced by the traditional steel RC structures especially in the field of planar and shell elements.
With the light weight of the textile reinforcement (1.8 g/cm3), high tensile strength textile mesh (from 1000 to 3500 N/mm2), high compressive strength of the matrix (> 70 N/mm2), high corrosive resistant of the matrix, high flexural, bending and torsional strength, etc., it provides endless possibilities in the strengthening or construction of light and durable structures.
In view of this, between two existing buildings which are 16 m apart, a pedestrian bridge would be built. A TRC enclosing shell structure with an organic shape and openings along the longitudinal sides was selected. Thus, maximizing the full material benefits of the TRC and ensuring pedestrian comfort.
The bridge was modeled, analyzed and optimized using Dlubal Software program RFEM. The conclusion and output was that indeed the thin shell bridge structure can be designed with TRC but further optimized for stability by providing additional steel tie bars incorporated into a series of transverse and longitudinal ribs and also locking the ends of the bridge with a concrete frame to reduce deformations.
The properties of the main shell: Maximum Height: 4 m; Maximum Width: 3.06 m; Thickness of Shell: 0.03 m; Radius of Ribs: 0.1 m; Number of Longitudinal Ribs: 6; Average Number of Mesh Layers: 3.