Steel Buildings in Europe

Part 10: Model Construction Specification 10 - 19 According to § 3.9 of EN 1993-1-8, the contract documents shall specify the class of friction surfaces for slip-resistant connections using pre-loaded 8.8 or 10.9 bolts. According to § 4.1 of EN 1993-1-8, the contract documents shall specify the quality level of welds according to EN ISO 25817. The frequency of inspection of welds shall be specified in the contract documents and shall conform to the requirements of EN 1090-2. 5.5 Fatigue – EN 1993-1-9 EN 1993-1-9 gives methods for the assessment of fatigue resistance of members, connections and joints subjected to fatigue loading. According to § 2(1) of EN 1993-1-9, structures designed using fatigue actions from EN 1991 (i.e., EN 1991-3) and fatigue resistance according to EN 1993-1-9 are deemed to satisfy an acceptable level of probability that their performance will be satisfactory throughout their design life. National choice is allowed through clauses listed in the Foreword to EN 1993-1-9. Additional contract document requirements According to § 3(1) of EN 1993-1-9, contract documents shall specify whether fatigue assessment shall be undertaken using either ‘damage tolerant method’ or ‘safe life method’. If the ‘damage tolerant method’ is specified, a prescribed inspection and maintenance regime for detecting and correcting fatigue damage shall be implemented throughout the design life of the structure. The ‘safe life method’ shall be specified in cases where local formation of cracks in one component could rapidly lead to failure of the structural element or structure. According to § 3(7) of EN 1993-1-9, contract documents shall specify the Failure Consequence classification (Low Consequence or High Consequence) in order to determine the partial factor for fatigue strength, in conjunction with the specified fatigue assessment method. 5.6 Material toughness and through-thickness properties – EN 1993-1-10 EN 1993-1-10 contains design guidance for the selection of steel for fracture toughness and for through-thickness properties of welded elements where there is a significant risk of lamellar tearing during fabrication, for constructions executed in accordance with EN 1090. The guidance given in Section 2 of EN 1993-1-10 shall be used for the selection of material for new construction. The rules shall be used to select a suitable steel grade from the European Standards for steel products listed in EN 1993-1-1. The choice of Quality Class shall be selected from Table 3.1 EN 1993-1-10 depending on the consequences of lamellar tearing.