Types Of Prestressing ppt / pdf
Types Of Prestressing Depending Of the feature of design construction prestressing construction may be classified into number of groups. a) External Prestressing : - It is prestress a concrete by adjusting its external reactions. For a simply supported beam external prestressing can be done by jacking against abutments . Jacking can be done at proper places to produce compression in the bottom fibres and tension in the top fibres. Such an arrangement, however cannot be easily accomplished in practice as even if abutments favourable for such a layout are obtainable, shrinkage and creep in concrete may completely offset the strains unless they can be readjusted. This type of prestressing is probably suited for arch bridges having rigid abutments. b) Internal Prestressing: - in such cases prestress is provided by high tensile wire against concrete.Various variations of internal prestressings are discussed below. 1) Linear and circular prestressing: - linear prestressing is applied is in...