ÖNORM EN 1999-1-5

EN 1999-1-5 applies to the structural design of aluminium structures, stiffened and unstiffened, that have the form of a shell of revolution or of a round panel in monocoque structures. EN 1999-1-5 covers additional provisions to those given in the relevant parts of EN 1999 for design of aluminium structures. The provisions in EN 1999-1-5 apply to axisymmetric shells (cylinders, cones, spheres) and associated circular or annular plates, beam section rings and stringer stiffeners, where they form part of the complete structure. Single shell panels (cylindrical, conical or spherical) are not explicitly covered by EN 1999-1-5. However, the provisions can be applicable if the appropriate boundary conditions are duly taken into account. Types of shell walls covered in EN 1999-1-5 can be (see Figure 1.1): — shell wall constructed from flat rolled sheet with adjacent plates connected with butt welds, termed ‘isotropic’; — shell wall with lap joints formed by connecting adjacent plates with overlapping sections, termed lap-jointed; — shell wall with stiffeners attached to the outside, termed ‘externally stiffened’ irrespective of the spacing of stiffeners; — shell wall with the corrugations running up the meridian, termed ‘axially corrugated’; — shell wall constructed from corrugated sheets with the corrugations running around the shell circumference, termed ‘circumferentially corrugated’. The provisions of EN 1999-1-5 are intended to be applied within the temperature range defined in EN 1999-1-1. The maximum temperature is restricted so that the influence of creep can be neglected. For structures subject to elevated temperatures associated with fire see EN 1999-1-2. EN 1999-1-5 does not cover the aspect of leakage.