architectural membrane association
Membrane Structures are often reinforced by cables. They can be used to stabilize the boundaries of the membrane panel when insetred into cable pockets. They can be used for creating the ridge or valley lines of those Membrane Sturctures. Cables are reinforcing supporting masts of Membrane Structures or create the primary construction on which the membrane is attached to.
According to DIN Standard 18 800 cables are rated as high tensile tension members.
Cable consist of many individual wires, i.e. individual cross sections. This reduces the defect rate per cross section as compared to monofilament individual cross sections (e.g. solid rods) to a minimum or even zero.
In lightweight constructions the following types are used: Spiral Strands (left picture) or Full Locked Cables (right picture).
Copyright by Pfeifer Seil- und Hebetechnik
All cable end connection calculations are based on the characteristic breaking load of the cable system.
Free cable length between fittings shall be at least fifty times the cable diameter for type 1 x 19 and 1 x 37. For all other types free cable length shall be at least seventy times the cable diameter
Copyright by Pfeifer Seil- und Hebetechnik GmbH
Unloaded cables show a non-linear load/elongation behaviour. Even cables of the same design and diameter have to be exposed to a defined load before their lengths can be compared. Elongation can be predicted for a prestretched cable only. Therefore the cables are prestretched and respective length measured under preload.
Required geometry and preloads are already taken into account during manufacturing of cables in the plant.
Corrosion protection is an essential component of safety engineering. Materials and substances used in corrosion protection must be environmentally safe and must offer a long-term effect. Corrosion Protection of cables can essentially be subdivided into four areas:
In most cases appropriate constructive measures render fire protection systems on the cable and its components unnecessary, as cables don’t add fire load. They are usually located far away from possible fire. In uncertain cases the fire authority report and building regulations of the federal states will specify the required fire protection system.