Advanced Package Training Scaffolding 2011.1 - Scia-Software GbR

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Alpha critical 38 Advanced Training The calculation of alpha critical is done by a stability calculation in Scia Engineer. For this calculation a Professional or an Expert edition is necessary. The stability calculation has been inputted in module esas.13. According to the EN 1993-1-1, 1 st Order analysis may be used for a structure, if the increase of the relevant internal forces or moments or any other change of structural behaviour caused by deformations can be neglected. This condition may be assumed to be fulfilled, if the following criterion is satisfied: = ≥ 10 for elastic analysis With: αcr: the factor by which the design loading has to be increased to cause elastic instability in a global mode. FEd: the design loading on the structure. Fcr: the elastic critical buckling load for global instability, based on initial elastic stiffnesses. If αcr has a value lower then 10, a 2 nd Order calculation needs to be executed. Depending on the type of analysis, both Global and Local imperfections need to be considered. EN1993-1-1 prescribes that 2 nd Order effects and imperfections may be accounted for both by the global analysis or partially by the global analysis and partially through individual stability checks of members. Global frame imperfection ϕ The global frame imperfection will be inputted for the whole structure by an imperfection value φ. This value can be calculated with the following formula (EN 1993-1-1 art. 5.3.2(3)a): = 1 200 ∙ ∙ = √ = 0,5 1 + 1 but ≤ ≤ 1,0 With: h The height of the structure in meters m The number of columns in a row including only those columns which carry a vertical load NEd not less than 50% of the average value of the vertical load per column in the plane considered.
These inclination functions are entered through “Main -> Library -> Structure, Analysis -> Initial deformations”: The Type is chosen as “According to code”, with a standard imperfection of 1/200. The height of the construction is 8.4m for both inclination functions. 39 Scaffolding There are 6 columns in the X-direction, but in the middle only 2 columns are inputted. Because a long part of structure only has 2 columns in the X-direction, in this example the number of columns in this direction has been inputted as “2”. There are 11 columns in the Y-direction. But the columns at the end are smaller than the middle ones. So in this example it is decided to input “9” columns in the Y-direction. The inclination function for the x-direction (Def_X) in Scia Engineer is displayed below: All combinations are entered four times, once with the inclination according to positive x and once according to positive y and negative x and negative y:
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 and 14: q2: Partial area load (EN12811-1, 6
Page 15 and 16: Load Case 1: Self Weight 15 Scaffol
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: 1a 5.2.2(3)c lb based on a global b
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
Page 65 and 66: 13. Scaffolding - Coupler Check Whe
Page 67 and 68: The internal force My for this beam
Page 69 and 70: Example ULS Check - Scaffolding che
Page 71 and 72: 71 Scaffolding
Page 73 and 74: 73 Scaffolding Where L is the membe
Page 75 and 76: 75 Scaffolding
Page 77 and 78: Shear The design value of the shear
Page 79 and 80: For a solid bar, round tube and hho
Page 81 and 82: 17. Template To create a template,
Page 83 and 84: 3. Inserting the user block into an
Page 85 and 86: Annex A: Wind pressure versus Wind

Advanced Package Training Scaffolding 2011.1 - Scia-Software GbR

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