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Introduction
Published in M. Rashad Islam, Civil Engineering Materials, 2020
The first item to be considered when selecting a material is the ability of its load carrying capacity in terms of bending, shear, and torsional capacity. The failure criterion is also a major concern. Brittle materials, such as cast iron, glass, etc., are very often not preferred, as they fail suddenly without showing any significant deformation. For example, for a 20-ft bridge where pedestrians are the only users, any material of steel, reinforced concrete, or wood would be able to withstand the pedestrian load. Then, more criteria are to be considered. Wood may be the cheapest option, but may not be appropriate if it is a high-frequency flood-prone area. Therefore, wood may not be durable and may not be an economically viable material considering the lifespan. Another case is that if the bridge is located in a family park, then a wooden bridge may be aesthetically welcomed regardless of cost or durability.
Field Testing of Pedestrian Bridges
Published in Eva O.L. Lantsoght, Load Testing of Bridges, 2019
Darius Bačinskas, Ronaldas Jakubovskis, Arturas Kilikevičius
Bridge testing can be of two types: acceptance testing and proof load testing.1 Acceptance testing is the verification of the bridge and structural response after the construction of a new bridge or after its repair or strengthening. The latter testing determines whether the behavior of the bridge meets the assumptions or hypotheses adopted at the design stage. It should be emphasized that information obtained during this testing is of particular importance. First, it allows validation and updating of the theoretical numerical model according to the testing results. Second, testing results are the starting point for the bridge owner to assess adequately the impact of potential damage on the safety and reliability of the bridge during degradation in the bridge structure over time. These studies are particularly important for pedestrian bridges, as defects due to flexibility of structures or loss of structural integrity can lead to significant changes in the load-bearing capacity, displacements, vibrations, or other parameters of the bridge. In the absence of initial information, at the beginning of operation of the bridge, or after the introduction of intervention measures, the subsequent adequate assessment of the structural degradation by experimental methods is not possible.
Conceptual Design of the Pedestrian Bridge
Published in Structural Engineering International, 2022
Pengzhen Lu, Yutao Zhou, Qun Lu, Jiahao Wang, Qingtian Shi, Dengguo Li
On the basis of meeting the function of pedestrian traffic, pedestrian bridge design actively pursues the change of form, boldly innovates in structure and material, and makes extensive use of steel33 and new composite materials,34 etc., and studies the mechanical properties, durability and application of different types of FRP bars in bridge construction. Yang et al. 35 summarized the performance and application of FRP cables on long-span cable bridges. Ahmadi36 and Wang37 et al. studied how Glass Fiber Reinforced Plastic (GFRP), new structural forms such as suspension systems, steel box beams and middle arches are comprehensively used to reflect the trending progress of structural technology and material technology through structural exposure. At the same time, the use of innovative composite materials technology can also reduce the cost of bridge construction, and help solve governments’ infrastructure deficit.38 At the same time, the façade form of the pedestrian bridge has undergone a great change with the plane layout taking on various forms such as curved, folded and ring-shaped (Fig. 8). Pedestrian bridges have moved away from being bulky and rough in favor of being nimble and novel, and towards an assembled, detachable, reusable steel frame structure and composite materials.