Knauf Seismic Design

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The main advantages of Knauf nonload bearing partitions are the reduction of construction weight (see table 3, page 7 and table 4) and the ductile behavior of deformation. The dead load decrease of non-load bearing construction components leads to a massive reduction of loads in the event of an earthquake. The most ideal application of Knauf partitions in connection with earthquake safety is their use as infi ll walls for skeleton constructions. The brittle and comparatively rigid deformation behavioral patterns of the infi ll masonry used generally causes load transfer with dangerous, explosion-like and Knauf Seismic Design Non-load bearing Partitions Table 4: Weight comparison of infill masonry and Knauf Drywall Systems W111/ W112 Weight Reduction 1 m² masonry d = 11.5 cm; Weight per unit area: approx. 145 kg/m² 1 m² metal stud partition, single layer; Weight per unit area: approx. 25 kg/m² 1 m² metal stud partition, double layer; Weight per unit area: approx. 50 kg/m² → Weight reduction by 65 % to 83 % unannounced collapse that can even lead Table 5: Stress resultants from lateral horizontal loads System W111 d = 100 mm W112 d = 125 mm Horizontal acceleration 0.5 g (4.9 m/s²) Max. shift [mm] Maximum bending moment [kNm] 2.5 - 14 0.1 - 0.3 2.0 11.6 - 25 0.3 - 0.6 2.6 Bending moment capacity [kNm] to the total collapse of the whole building. Even when highly deformed, drywall partitions maintain their enclosing function and do not collapse completely. [7] According to the “Report of Earthquake Proof Execution of Partitions and Suspended Ceilings” by Dr. Rainer Flesch of the “Bundesforschungs- und Prüfzentrum Arsenal” (Federal Research and Test Centre Arsenal) [6], Knauf metal stud partitions can effectively resist and absorb lateral loads caused by earthquake acceleration and their own weight. Table 5 shows calculated stress resultants for a lateral horizontal acceleration of 2.5 m h 3.5 m U ; V´ 0.5 g on Knauf partitions W111 and W112. 2.5 m l 15.0 m Figure 13: Lateral horizontal loading 10
Table 6: Maximum Resistible Horizontal Acceleration Knauf gypsum board partition system W111 single layer (1x12.5 mm) 25 kg/m² W112 double layer (2x12.5 mm) 50 kg/m² Size of stud / thickness of wall [mm] / [mm] Maximum wall height [m] Bending moment capacity [kNm] 50 / 75 3.0 1.5 ≤ 5.4 g 75 / 100 4.5 2.0 ≤ 3.1 g 100 / 125 5.0 2.5 ≤ 3.2 g 50 / 100 4.0 2.0 ≤ 2.0 g 75 / 125 5.5 2.6 ≤ 1.4 g 100 / 150 6.0 3.2 ≤ 1.4 g Maximum resistible horizontal acceleration Values for the maximum acceptable horizontal acceleration based on load capacities according to [8] are stated in table 6. However, going by the following assumption horizontal in-plane loads caused by story shift cannot be borne by these partitions [6] (fi gure 14). With an assumed story shift of 1 % to 1.5 %, a maximum height of wall of 3.5 m, and the resulting story shift of ∆l = 3.5 to 5.3 cm, F M l the resulting stresses cannot be absorbed by the partition without cracks developing. The enclosing function would still be retained, but a big enough joint is necessary h 3.5 m in order to absorb the deformation of the structure. 2.5 m l 15.0 m Figure 14: Horizontal in-plane load 30 mm V' x A viable solution according to the example cited above is shown in fi gure 15. In individual cases the necessary size of the joint has to be determined exactly through a calculation of the expected deformation. U Runner (d = 1.0 mm) spacing of dowels = 0.5 m Figure 15: Detail of deformation joint Figure 16: Statical separation of non-load bearing partitions 11
Page 1 and 2: Knauf Seismic Design Edition 08/200
Page 3 and 4: Soft Buildings Advantages: Appropri
Page 5 and 6: Knauf Seismic Design Seismic Zones
Page 7 and 8: Knauf Seismic Design Less Weight -
Page 9: Knauf Seismic Design Applications N
Page 13 and 14: Table 8: Knauf Suspenders 0.25 kN A
Page 15 and 16: Table 10: Collapse loads for metal
Page 17 and 18: Knauf Seismic Design Material Value
Page 19 and 20: Table 14: Selected international st

Knauf Seismic Design

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