Рубрика: Tensile Surface Structures: A. Practical Guide to Cable and. Membrane Construction

Measurement of membrane stresses

In order to avoid permissible stresses being exceeded, check measurements have to be performed on installed and ten­sioned membranes. The measurement of membrane stress is, however, problematic. Measurement of the strain with strain gauges is difficult to handle and evaluate. The strip has to be attached to the membrane surface when this is stress-free in […]

Measuring with hydraulic force transducers

The best-known method of determining the force in ropes in steel erection is the measurement of the compression in hy­draulic cylinders installed in the flow of the forces during the pretensioning process. Various intermediate measurements are undertaken in the course of force introduction into the rope by hydraulic presses controlled according to force or travel. […]

Control of the forces in flexible structural elements

The assembling of different materials and the involvement of all parts of the structure in load transfer places high de­mands on the geometry of lightweight structures. The de­formations of the load-bearing elements in tension result­ing from form-active interaction limit each other mutually. The coordination of the differing strains of the materials is therefore fundamental for […]

. Application of surface loads

Synclastic surfaces cannot be pretensioned by tangen­tial displacement of elements in the surface. They have to be tensioned by applying surface loading perpendicular to the plane. The pretensioning of rope hanging roofs is done by ballasting. This creates a loading condition, which en­sures that no compression will occur in the tension elements through external influences […]

. Application of load by tilting of shaft-shaped supporting elements

Point loads can also be introduced into membrane surfaces by displacing or rotating the stiff primary elements. This ten­sioning process is frequently used for the erection of awnings, where the fabric is pretensioned by the tilting of the masts and the shortening of the stay and edge ropes (Fig. 356). The fabric is fixed to […]

Application of loads at points

Flexible edge details with ropes or belts running in sleeves can be pretensioned by displacing the stiff corner fittings (B in Fig. 353) at points. This can be direct pulling or pushing of the fitting to the anchorage position. With awnings, the dis­placement is mostly produced by shortening the stay ropes, which causes a rotation […]

. Application of loads by tilting the edge beams

The introduction of linear edge loads into the membrane surface can also be achieved by changing the position of the stiff edge beam. One example of this is the tilting of arch­shaped edge beams. This is an efficient method of tension­ing, which is mostly used with many parallel rows of edge arches. The membrane surface […]