Abstract
An innovative steel cable-stayed pedestrian bridge structure and the preliminary design methodology are provided in this article. The advantages and disadvantages of the bridge design are presented. The comparative analysis of the innovative steel cable-stayed pedestrian bridge structure and a similar structure of a single pylon fan cable-stayed bridge with an 80 m span is provided, the main criteria are reviewed and conclusions are formulated. The main features of the innovative branched cable-stayed bridge behaviour are reviewed. An overview of technical-economic efficiency and conclusions are presented.
Highlights
Cable-stayed bridges have been widely used since the 1950s
If the pedestrian load of 5 kN/m2 of the stiffening girder of the bridge is evenly distributed across the entire length, efficiency as high as 30% can be achieved compared to the case of the standard fan cable-stayed bridge (Figure 11)
Applying such a load to only one side of the bridge increases the efficiency of the branched cable-stayed bridge up to 50%, estimations being made according to the stresses on the stiffening girder (Figure 11)
Summary
Cable-stayed bridges have been widely used since the 1950s. Due to their unique, cost-effective, lightweight and easy-to-install structure these bridges have become a very popular solution for medium and long spans (Podolny, 2011). The nonlinear cablestayed bridge behaviour is described in detail by Nazmy and Abdel-Ghaffar (1990) in “Three-dimensional nonlinear static analysis of cable-stayed bridges” It describes the three main reasons for geometrical non-linearity and presents their corresponding calculations. Despite the fact that the cable-stayed bridge structure element materials work according to material linear model, the displacement ratio of the structure load itself is geometrically non-linear under the design loads. Such geometrically non-linear behaviour is present for three main reasons (Nazmy & Abdel-Ghaffar, 1990):. The preliminary design and technical-economic efficiency of the two-level branched cable-stayed bridge (2012) It provides reasons for geometrical non-linearity and possible calculations of such behaviour. The advantages of such structure are indicated and a comparative analysis of the standard fan cable-stayed bridge of a similar length is performed
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