Reinforced concrete members with circular cross-section are widely used in bridge engineering, either as piers or as piles to support pile caps. Such members are often subjected to combined shear, bending and axial loading. Compared with the overwhelming studies of shear in rectangular members, relatively few theoretical studies of the shear resistance of circular members can be found in the literature. This paper presents a model that can be used to predict the shear strength of circular members. The model is an extension of the plasticity-based crack sliding model originally developed for rectangular beams. Analytical solutions for simply supported and restrained members are presented. The results obtained by the model have been compared with a large number of tests. Satisfactory agreement has been found.
2 3The core part of the Constantine viaduct is a 756 m long cable-stayed bridge currently under construction in Constantine, Algeria. Due to its slender appearance, clear visual lines and prominent location, it will be another landmark structure for a city already known for its historic and beautiful bridges. This paper focuses on the design and construction of the cable-stayed bridge with its 259 m main span, central pylons, central cable plane and posttensioned concrete box girder with internal and external tendons. The architectural form is characterised by extensive use of curved structural elements. The design considerations associated with placing an aesthetically pleasing major bridge in the centre of an old city with many restrictions to alignment and consequently complex geometry are addressed. The paper outlines key structural elements and selected details such as the anchorage blocks for the stay cables in the bridge girder and the monolithic connection between the pylon and the deck. It also reports on the construction methodology and control.Bridge Engineering Volume 168 Issue BE2
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