Rothoblaas - X-RAD Page 78
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X-ONE X-PLATE X-SEAL FIRE PERFORMANCE OF XRAD CONNECTION WITH XSEAL PROTECTION The X-RAD system involves positioning the structural connection, consisting of X-ONE and X-PLATE, on the wall axis. This allows the perfectly pre-shaped components of the X-SEAL system to adhere to the metal components of the connection, thereby ensuring hermetic and thermal-acoustic insulation. In order to understand the fire performance of this system and to verify the degree of fire protection offered by the X-SEAL components to the X-RAD system, a research programme is underway at the Università Tecnica di Monaco (TUM). B A Layout of the thermocouples on the surfaces of the samples Assembly of the X-SEAL components To monitor evolution of the temperatures during the test, thermocouples were installed on: outer surface of MI central plate side and upper surface of X-ONE head of VGS screws on X-ONE connector outer head of the bolts on X-ONE connector LVL insert head surface of X-ONE connector The test was conducted in compliance with the European standard EN 1363-1, which specifies the main principles for determining the fire resistance of various elements of construction when subjected to standard fire exposure conditions. 17 9/10 13 12 5/6 1/2 3/4 15 14 11 7/8 A mid-floor MI node was studied at this stage, complete with X-ONE, X-PLATE and X-SEAL and its acrylic belt sealing, assembled inside a 5-layer CLT panel. Two different types of specimens were tested: structural wall with X-RAD system without any coating on the fire side (A) structural wall with X-RAD system covered with type A coated gypsum plasterboard according to DIN EN520 assembled as backing (B) 16 18 Layout of the thermocouples on X-ONE and X-PLATE 1.00 In this regard it may be useful to recall the decline of the mechanical properties of steel as the temperature increases, as described by Eurocode EN 1993:1-2. Note the significant reduction in yield stress, in elastic modulus and in the proportionality limit, when above 400°C. When 500°C have been reached, the yield stress is reduced by 20% and the elastic modulus by 40%. This temperature value is considered as the reference value during the test. 0.80 kθ 0.60 0.40 0.20 0.00 200 0 400 600 Temperature [°C] 76 X-SEAL 800 1000 1200 yield stress ky,θ = fy,θ / fy elastic modulus kE,θ = Ea,θ / Ea proportionality limit kp,θ = fp,θ / fy
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