Steel Buildings in Europe

Part 7: Model Construction Specification 7 - 41 Proposed Clauses Commentary 7.2.3 Structural carbon steels shall conform to the requirements of the relevant European product standards as listed in Table 2 of EN 1090-2, unless otherwise specified on the drawings. Grades, qualities and, if appropriate, coating weights and finishes, together with any required options permitted by the product standard, including those related to suitability for hot dip zinc- coating, if relevant, shall be as specified on the drawings. § 5.3.1 of EN 1090-2. 7.2.4 For carbon steels, surface condition shall be as follows: Class A2, for plates in accordance with the requirements of EN 10163-2; Class C1, for sections in accordance with the requirements of EN 10163-3. If relevant, surface imperfections (such as cracks, shell or seams) or repair of surface defects by grinding in accordance with EN 10163, shall comply with the following restrictions : (insert list of special restrictions) § 5.3.3 of EN 1090-2. (Optional clause) 7.2.5 For EXC3 and EXC4, the locations (and width) where internal discontinuity quality class S1 of EN 10160 is required, are specified on the relevant drawings. § 5.3.4 of EN 1090-2. Especially for welded cruciform joints transmitting primary tensile stresses through the plate thickness, and for areas close to bearing diaphragms or stiffeners. 7.2.6 Areas where material shall comply with requirements for improved deformation properties perpendicular to the surface (according to EN 10164) are specified on the drawings. § 5.3.4 of EN 1090-2. Consideration should be given to specifying such material for cruciform, T and corner joints. Should only be invoked where necessary; specify only those parts of the structure which need these properties. 7.3 Welding consumables 7.3.1 All welding consumables shall conform to the requirements of EN 13479 and the appropriate product standard, as listed in Table 5 of EN 1090-2. The type of welding consumables shall be appropriate to the welding process (defined in § 7.3 of EN 1090-2), the material to be welded and the welding procedure. § 5.5 of EN 1090-2. 7.4 Mechanical fasteners 7.4.1 All mechanical fasteners (connectors, bolts, fasteners) shall conform to the requirements of § 5.6 of EN 1090-2. Studs for arc stud welding including shear connectors for steel/concrete composite construction shall comply with the requirements of EN ISO 13918. 7.4.2 The property classes of non-preloaded bolts and nuts, and surface finishes, shall be as specified on the drawings. 7.4.3 The property classes of preloaded bolts and nuts, and surface finishes, shall be as specified on the drawings. HV bolts are sensitive to over-tightening, so they require a greater level of site control. It is not advisable to use both HR and HV assemblies on the same project.