Structural analysis examples7/9/2023 ![]() ![]() ![]() A cable may be defined as the structure inpure tension having the funicular shape of the load. It is easy to visualize that a cable hung from two supports subjected to external load must be intens cable. The shape assumed by aropeorachain (with no stiffness) under the action of external loads when hung from two supports is known as a funicular shape. In the following sections, cables subjected to concentrated load and cables subjected to uniform loads are considered. They are also used in electrical transmission lines and for structure supporting radio antennas. Cables are mainly used to support suspension roofs, bridges and cable car system. Cables and fabric structures are deformable structures. However, it should be noted that deformations are stillsma ll. Unlike rigid structures, deformable structures undergo changes in their shape according to externally applied loads. Beams trusses and frames are examples of rigid structures. Rigid structures support externally applied loads without appreciable change in their shape (geometry). Structure may be classified into rigid and deformable structures depending on change in geometry of the structure while supporting the load. In the last few pages, two hinged arch and hinge less arches are considered. In the few previous pages, arches in general and threehingedarchesin particular along with illustrative examples are explained. In the few previous pages, cables subjected to uniform and concentrated loads are discussed. For long span structures (fore.g.in case bridges) engineers commonly use cable or arch construction due to their efficiency. Cables and archesareclosely related to each other and hence they are grouped in this course in the same module. ![]()
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