Byggnadsstommar

Kommittébeteckning: SIS/TK 142 (Konstruktionsstål)
Källa: CEN
Svarsdatum: den 23 okt 2018
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This part of this European standard specifies tolerances for hot finished circular, square, rectangular and elliptical structural hollow sections, manufactured in wall thicknesses up to 120 mm, in the following size ranges:

— Circular: Outside diameters up to 2 500 mm;

— Square: Outside dimensions up to 800 mm × 800 mm;

— Rectangular: Outside dimensions up to 750 mm × 500 mm;

— Elliptical: Outside dimensions up to 500 mm × 250 mm.

The formulae for calculating sectional properties of sections manufactured to the dimensional tolerances of this standard, to be used for the purposes of structural design, are given in Annex A.

Dimensions and sectional properties for a limited range covering the more common sizes are given in Annex B.

NOTE The designation of the sections' major axis (yy) and its minor axis (zz) align with the axis designation used for structural design in the structural Eurocodes.

Kommittébeteckning: SIS/TK 142 (Konstruktionsstål)
Källa: CEN
Svarsdatum: den 6 nov 2018
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This part of prEN 10219 specifies the technical delivery conditions for electric welded and submerged arc welded cold formed structural steel hollow sections of circular, square, rectangular or elliptical forms and applies to structural hollow sections formed cold without subsequent heat treatment.

The general conditions (product characteristics, test methods and performance criteria that apply under the Construction Products Regulations) are specified in prEN 10219-1 and the requirements for tolerances, dimensions and sectional properties in prEN 10219-3.

NOTE 1 prEN 10219-1 covers provision of the Construction Products Regulations (CPR) to fulfil European law for construction products. The technical delivery conditions are described within prEN 10219-2 in combination with Clauses 2, 3, 4, 5, 7 and 8 of prEN 10219-1.

NOTE 2 The attention of users is drawn to the fact that whilst cold formed grades in prEN 10219-2 can have equivalent mechanical properties to hot-finished grades in prEN 10210-2 the sectional properties of square and rectangular hollow sections in prEN 10219-3 and prEN 10210-3 are not equivalent.

NOTE 3 A range of steel grades is specified in this European Standard and the user should select the grade most appropriate to the intended use and service conditions. The grades and mechanical properties, but not the final supply condition of cold formed hollow sections are comparable with those in EN 10025-2, EN 10025-3, EN 10025-4, EN 10025-5, EN 10025-6, EN 10149-2 and EN 10149-3.

NOTE 4 Hollow sections for offshore structures are covered in EN 10225.

Ämnesområden: Träkonstruktioner
Kommittébeteckning: SIS/TK 182 (Trä)
Källa: ISO
Svarsdatum: den 22 nov 2018
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This Standard specifies methods of evaluating the effectiveness of glued laminated timber face and edge bonds within a manufacturing plant by cleaving of the glue line in both dry and wet conditions. It is not intended that it be used for initial type testing where cyclic delamination or block shear is preferred. It is based on the principle that, provided minimum wood failure percentages are met, then the bond strength exceeds the perpendicular to the grain tension strength of the under-lying substrate and therefore the bond is not the weak element limiting the integrity of a glulam assembly.
Ämnesområden: Träkonstruktioner
Kommittébeteckning: SIS/TK 182 (Trä)
Källa: CEN
Svarsdatum: den 26 nov 2018
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This International Standard specifies a method based on density, for the selection of pieces of timber used in determining the strength and stiffness properties of joints between members of structural timber made with mechanical fasteners. It is intended to be used in conjunction with a test standard specifying a test method.

It is assumed the timber density is normally distributed and that any deviations are reported.

This International Standard is applicable only to specimens of structural timber.

NOTE It is emphasized that the timber density is only one of the properties that may influence the strength of a joint. Other relevant properties are, for example, growth-ring size and orientation, toughness and hardness.