Advanced Package Training Scaffolding 2011.1 - Scia-Software GbR

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Working wind load 14 Advanced Training A uniformly distributed velocity pressure of 0,2 kN/m² is taken into account. To make allowance for equipment or materials which are on the working area, a nominal reference area is assumed. This area is 400mm and includes the height of the toeboard. (En 12811-1, 6.2.7.4.2) Area of wind loading The wind load is inputted as an area load. The amount of this load, depends on the amount of the loaded area itself, so without cladding a smaller wind load will be inserted than with cladding or netting. Principle of combinations Following EN 12811-1, 6.2.9.2 the load cases have to be combined in two different ways: the service condition and the out of service condition In each individual case the service condition and the out of service condition shall be considered. a) The service condition consists of: 1) The self weight of the scaffold 2) Uniformly distributed service load (EN 12811-1, Table 3, q1) acting on the working area of the most unfavourable decked level 3) 50 % of the load specified in a)2) shall be taken to act on the working area at the next level above or below if a working scaffold has more than one decked level. 4) Working wind load b) The out of service condition consists of: 1) The self weight of the scaffold 2) A percentage of the uniformly distributed service load (EN 12811-1, Table 3, q1) acting on the working area of the most unfavourable decked level. The value depends on the class: Class 1: 0% (no service load on the working area) Classes 2 and 3: 25% (representing some stored materials on the working area) Classes 4, 5 and 6: 50% (representing some stored materials on the working area) 3) The maximum wind load In cases a)2) and b)2), the load shall be taken as zero, if its consideration leads to more favourable results. Load cases in Scia Engineer The following load cases will be inputted in Scia Engineer:
Load Case 1: Self Weight 15 Scaffolding In this load case the complete self weight of the structure is included, including the toeboards, floor board elements, ... This load case is automatically calculated by Scia Engineer. Load Case 2: Self Weight of the toeboards (and other structural members) The self weight of the toeboards can be calculated as follows: Surface area of the profile = 15 cm x 2 cm = 30 cm² = 30 x 10 -4 m² Density of the toeboard = 773.3 kg/m³ Weight of the toaboard per meter = 30 x 10 -4 m² x 773.3 kg/m³ = 2.32 kg/m Line load: 2.32 x 9.81 N/m = 22,76 N/m = 0,023 kN/m Load Case 3: Service load Main floor This load case represents the service load that operates over the entire main floor. “Main floor” means the most important/crucial floor of the scaffolding. If the load is put on this floor, it leads to the most critical values. In this example, a class 3 scaffolding has been inserted, so a divided load of 200 kg/m², or 2 kN/m² (EN12811-1 Table 3). This is transferred to floor boards. Load Case 4: Service load Secondary floor Analogous to load case 2, the service load in this load case is entered on the complete secondary floor. Secondary floor refers to the working area at the first level above or below the main floor. According to the code EN12811-1, 50% of the service load has to be put on the secondary floor. Load Case 5: Service load 25% This load case represents an accumulation of materials and equipments for the complete main working area, when the scaffolding is subject to the maximal wind load. Note In some cases it can be necessary to input a non symmetric load on the construction. So it can be important to input a load case, completely analogous to load case 3, 4 or 5, but here the service load is only put on half of the main floor. By executing this load case, the structure is eccentrically loaded, so effects that counterbalance each other in a symmetrical load, are revealed here. Example:
Page 1 and 2: Advanced Package Training Scaffoldi
Page 3 and 4: Contents 1. Introduction ..........
Page 5 and 6: 1. Introduction 5 Scaffolding This
Page 7 and 8: Materials 7 Scaffolding For the mat
Page 9 and 10: FLOOR BOARDS 9 Scaffolding The inpu
Page 11 and 12: END INPUT OF CONSTRUCTION 11 Scaffo
Page 13: q2: Partial area load (EN12811-1, 6
Page 17 and 18: 17 Scaffolding In the example discu
Page 19 and 20: 1 2 q p ( z) = ce ( z) ⋅ qb = ce
Page 21 and 22: q p e 21 Scaffolding EN 12811-1 §6
Page 23 and 24: 4. Results It is recommended to fir
Page 25 and 26: 6. Scaffolding SLS Check - EN 12811
Page 27 and 28: 7. Steel Code Check ULS Check - EN
Page 29 and 30: Stability Check Buckling data 29 Sc
Page 31 and 32: - Go to the menu “Steel -> Check
Page 33 and 34: 8. Scaffolding ULS Check - EN 12811
Page 35 and 36: 9. Non-Linear Combinations Overview
Page 37 and 38: 1a 5.2.2(3)c lb based on a global b
Page 39 and 40: These inclination functions are ent
Page 41 and 42: 41 Scaffolding The buckling curve u
Page 43 and 44: 43 Scaffolding In this figure, the
Page 45 and 46: Start Choose ΔF u0 = 0 F0 = 0 F =
Page 47 and 48: 47 Scaffolding As specified, the Ne
Page 49 and 50: 49 Scaffolding In the results menu,
Page 51 and 52: ∙ + ∙ = ∙ The equation f
Page 53 and 54: Example Stability_Imperfe Imperfect
Page 55 and 56: Buckling Shape [-] A polynomial has
Page 57 and 58: 57 Scaffolding Using this combinati
Page 59 and 60: 12. Input Hinge Types and non-linea
Page 61 and 62: The rigidities are filled out and t
Page 63 and 64: 63 Scaffolding It is assumed that t
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13. Scaffolding - Coupler Check Whe
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The internal force My for this beam
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Example ULS Check - Scaffolding che
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71 Scaffolding
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73 Scaffolding Where L is the membe
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75 Scaffolding
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Shear The design value of the shear
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For a solid bar, round tube and hho
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17. Template To create a template,
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3. Inserting the user block into an
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Annex A: Wind pressure versus Wind
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Advanced Package Training Scaffolding 2011.1 - Scia-Software GbR

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