Wind load,application of wind load to the chimney

Hello.There is a task to model and calculate the structures of brick chimney. A visual representation of the wind loading is not created when applying the static wind load:“There are no slabs to which wind load can be applied.”Since the construction of chimney has no slab, will such wind load be taken into account in the LIRA-FEM calculation and how to visualize it?

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Роман_128

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Mar 26, 2015 11:20:21

Hello.
There is a task to model and calculate the structures of brick chimney.
A visual representation of the wind loading is not created when applying the static wind load:
“There are no slabs to which wind load can be applied.”
Since the construction of chimney has no slab, will such wind load be taken into account in the LIRA-FEM calculation and how to visualize it?

Al2O3

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Mar 27, 2015 11:52:57

The wind load in SAPFIR is applied only to slabs, in the properties of which is set: “sustain wind load” = yes.
Wherein the choke and pressure factors are summarized and represented as a uniform aerodynamic coefficient 0.8 + 0.6 = 1.4 (by default). Slabs separate the building into fragments vertically. The areas of these fragments in the projection toward the wind determines the load taking into account the wind pressure at the appropriate height.The loads are distributed linearly along the ends of each slab by the wind; they can be seen in structures mode.Accordingly, in the absence of slabs the wind will not be attached.

Александр Лазарев Regula visitor Posts: 160 Points: 301 Joined: Jul 31, 2007 «ЛИРА САПР»	#3 People who like this:0 Yes/0 No Mar 30, 2015 17:50:40 Since the wind load is applied to the ends of the floor slabs, you will need to enter some dummy slabs to the model. Dummy slabs of small thickness and light weight.

Pro100x3mal

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Mar 31, 2015 12:16:25

Alternatively, you can create these dummy slabs in the Sapfir on the necessary height, then apply wind load, move to the analytics and delete these slabs but leave the load. If you need to create nodal load, then you manually have to divide each distributed load by the width of the deleted slab to which it was applied (if the chimney is round, then divide by diameter).

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chuyits Visitor Posts: 35 Points: 17 Joined: Jul 22, 2013	#5 People who like this:0 Yes/0 No Apr 1, 2015 11:26:10 When export form Sapfir to Lira the wind load anyway comes as a nodal load and is applied to the nodes of the slab finite elements.

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