http://www.liraland.com New posts in Wind pulsation and problems of modeling of forum at liraland.com [www.liraland.com] en http://backend.userland.com/rss2 Mon, 27 Jul 2026 02:57:08 +0300 Wind pulsation and problems of modeling in forum General Discussion.
This seems to be the fifth version of the LIRA and earlier one. I don’t know if there were any restrictions between fifth and eighth version, but eighth version doesn’t have it.
Dec 19, 2014 15:02:51, ander.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12302/ http://www.liraland.com/forum/messages/forum3/topic1680/message12302/ Thu, 19 Dec 2013 15:02:51 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
Good afternoon. What does it mean "Earlier versions"? Which one? I check the problem (multi-tier flyover), which is made by my colleague. Wind is set uniformly distributed on the metal elements. I decided to add "pulsation component". Is it necessary to reset "static" wind to nodes, or program will correctly work out uniformly distributed load and redistribute loads to nodes independently?

I have LIRA-SAPR 2012 (R3.2)
Thank you
Dec 19, 2014 14:51:47, Александр Жемирев.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12300/ http://www.liraland.com/forum/messages/forum3/topic1680/message12300/ Thu, 19 Dec 2013 14:51:47 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
Yay! Thanks!
Dec 15, 2014 12:09:42, Екатерина_Викторовна.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12286/ http://www.liraland.com/forum/messages/forum3/topic1680/message12286/ Sun, 15 Dec 2013 12:09:42 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
This help section is not corrected. We will fix it.
Dec 15, 2014 11:59:15, alekstish.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12284/ http://www.liraland.com/forum/messages/forum3/topic1680/message12284/ Sun, 15 Dec 2013 11:59:15 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
Thank you for the answer. I have managed next in the LIRA references:

How to specify the wind load with pulsation?

In order to analyze the structure for wind load with pulsation, you should specify two load cases. One of them, e.g. load case number N1, is static and will be named as static wind load case for pulsation. In this load case you have to specify only nodal loads corresponding to wind effect in required wind area.
Dec 15, 2014 11:55:53, Екатерина_Викторовна.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12283/ http://www.liraland.com/forum/messages/forum3/topic1680/message12283/ Sun, 15 Dec 2013 11:55:53 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
Hello, Kateryna
Really, there was such a restriction in earlier versions. At the moment this is not necessary. When using large grid of finite element you should pay attention to boundary conditions which can take part of the load.
Dec 15, 2014 11:03:13, alekstish.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12281/ http://www.liraland.com/forum/messages/forum3/topic1680/message12281/ Sun, 15 Dec 2013 11:03:13 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
Hello! Consult me, please, on next question. I set wind load taking into account pulsation (dynamic load case). One of my colleagues said that load in this case, need to be specified only for nodes. Otherwise, the calculation will be performed correctly. For example, the monolithic wall is modelled using elements 0.3x0.3m. The uniformly distributed wind load at the given height is 35 kg/m2. It means that I have to set in each node: 0.3x0.3x35/4=0.79kg. Is it impossible to set uniformly distributed load on the plate? I have not found information about this in the LIRA manuals. Yet
Dec 11, 2014 12:01:17, Екатерина_Викторовна.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12262/ http://www.liraland.com/forum/messages/forum3/topic1680/message12262/ Wed, 11 Dec 2013 12:01:17 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
It is enough to have two load cases for constant load. First is for the shaft, and other is for the rest. Dead weight of the building is taken into account by these conditions.

During the creation of the mass from load cases, it is required to ignore shaft load case. It follows, that connection of two parts of the building during dynamic calculation would be possible only through a common foundation slab and the ground, if you use volumetric elements for modeling. no volume in this case it would be something minor. You can also have a separate foundation for the mine. But in this case it would be something minor. You can also have a individual foundation for the shaft.
Sep 18, 2014 10:42:51, рекс.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12055/ http://www.liraland.com/forum/messages/forum3/topic1680/message12055/ Wed, 18 Dec 2013 10:42:51 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
If shaft does not affect loads on the basis, then maybe it is easier not to set shaft?
You can define loads from the shaft on the basis from results of particular load cases and set them directly as loads.
Previously, you could set super element for not interesting vibrations. Now I do not know whether it works or not.
Sep 18, 2014 07:41:36, ander.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12054/ http://www.liraland.com/forum/messages/forum3/topic1680/message12054/ Wed, 18 Dec 2013 07:41:36 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
Thank you very much for the help. Is it possible during the calculation of pulsation set individual constructions, for which it would not be taken into account? For example, in this project elevator shaft works separate from the frame of the building and does not affect its movement. At the same time, pulsation on this shaft is calculated.
Yours sincerely, Anton
Sep 17, 2014 16:38:43, santon85.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12053/ http://www.liraland.com/forum/messages/forum3/topic1680/message12053/ Tue, 17 Dec 2013 16:38:43 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
Elements of the staircase and floor slab do not have common nodes.

[FILE ID=10112]

Sep 16, 2014 16:35:54, alekstish.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12052/ http://www.liraland.com/forum/messages/forum3/topic1680/message12052/ Mon, 16 Dec 2013 16:35:54 +0200 General Discussion Wind pulsation and problems of modeling in forum General Discussion.
Hello!
Tell me, please, what went wrong? I have created a scheme of multi-storey frame. Also I have added wind load and pulsation for it, according to the reference. I was very confused by the results. Elevator shafts and the frame itself are moving in different directions. What did I wrong? File is made in LIRA-SAPR 2013.
Yours sincerely, Anton!
1.lir
Sep 15, 2014 13:21:47, santon85.]]> http://www.liraland.com/forum/messages/forum3/topic1680/message12051/ http://www.liraland.com/forum/messages/forum3/topic1680/message12051/ Sun, 15 Dec 2013 13:21:47 +0200 General Discussion