Planificações, Como utilizar unfold_corner_ratios.inp

Tekla Structures
Not version-specific
Tekla Structures
polybeam
Planificação
planificar
raios
unfold_corner_ratios.inp
Unfold
corner
ratios
Environment
Not environment-specific

O que são racios de planificação de quinagens (unfold_corner_ratios.inp)?

Unfold_corner_ratios.inp é um ficheiro que contém informações Tekla Structures usa para planificar polybeams e, assim, medir seu comprimento. Ao usar um valor "Ratio" entre 0-1, o arquivo indica a Tekla Structures como o polybeam será planificada. O arquivo funciona através da definição de tipos de perfil e como devem ser desdobrado (ou seja, comprimento medido) com base certas características da polybeam, como chanfros se ele tem curvas em linha reta ou, raio de curvatura, tipo de material, de perfil, etc.

Quais as variaveis que afetam o comprimento da poliviga planificada?

Os rácios de planificação de quinagens são utilizados de maneira diferente, dependendo se você ter modelado polybeams com chanfros retos ou curvas. Abaixo está um fluxograma que explica como interage unfold_corner_ratios.inp com outras opções avançadas.
 

Image
unfold_corner_ratios1.png

 

Como Tekla Structures lê unfold_corner_ratios.inp

 

O ficheiro unfold_corner_ratios.inp é lido a partir das pastas do sistema, mas também pode ser colocado na pasta da empresa, Projeto, ou pasta do Modelo.

Tekla Structures irá procurar unfold_corner_ratios.inp na mesma ordem como faz normalmente com outros arquivos, isto é,pastas do Modelo, projeto, empresa, sistema (ambiente). Tekla Structures usará o primeiro arquivo que encontra, e ignorar qualquer outro. Não há fusão de arquivos. unfold_corner_ratios.inp não é usado com vigas curvas (ou seja, não polybeams, mas vigas curvas da caixa de diálogo Propriedades de viga).

Formato do unfold_corner_ratios.inp

O ficheiro unfold_corner_ratios é em formato de texto que utiliza linha que representa certo tipo de vigas poligonais. O formato dessa linha é como o seguinte:

 

Image
unfold_corner_ratios2.png

Tipo:

• 1 é recomendado para polivigas com qualquer perfil.
• 2 é recomendado para polivigas com peril de chapa (por exemplo, perfis "PL")

• 3 é para peças que não são planificadas e seguem o antigo calculo de comprimento de poliviga (veja o fluxograma do comprimento acima, XS_USE_OLD_POLYBEAM_LENGTH_CALCULATION).(Por exemplo, a linha 3 L** desliga a planificação dos perfis L.)

Este tipo de valores não é exclusivo. Tekla Structures reconhece todos os tipos de poliviga (chapas/perfis não-chapa) independentemente de, por exemplo, "1" ou "2" ser usado. A unica diferença são os valores subsequentes especificados no ficheiro inp, Tekla Structures irá tratar esses numeros como sendo coisas diferentes dependendo de qual valor "tipo" é usado.

O exemplo a seguir irá explicar isso mais claramente. Temos três polivigas, uma viga de 300mm de espessura, e dois poliviga barra com perfil PL300x20.

 

Image
unfold_corner_ratios3.png


 

Por exemplo, se a linha utilizada for

2 * * 0 1000 1 0 180 1

Todas as polivigas serão considerados (independentemente do tipo = 2). O valor de "1000" será considerado como uma "rotação" (no caso de Tipo = 1) ou uma "espessura" (no caso de Tipo = 2). Assim, por exemplo, se o valor de "1000" é alterado para "299", apenas a terceira poliviga irá conformar.

Tekla Structures utiliza o extremo solido para determinar a "espessuda" de peça. Por exemplo, para a viga em I e a segunda chapa, a "espessura" seria ambos de 300mm. A espessura da terceira chapa seria apenas 20mm, uma vez que é rodada.

Da mesma forma, se a linha fosse lida:


1 * * -180 180 1 0 180 1

O terceiro e quartos valores ("-180" e "180") seria "Rotação", de acordo com o tipo = 1. Isto seria aplicavel a todas as polivigas independentemente do seu perfil.

When a polybeam qualifies in more than one line of unfold_corner_ratios.inp, Tekla Structures will unfold the polybeam according to the first line the polybeam applies to, starting from the top of the file downwards. For example, if we had both lines:

2 * * 0 1000 1 0 180 1
1 * * -180 180 1 0 180 0

In this case, if a polybeam conforms to both line variables, then it would be unfolded using the Ratio = 1, as indicated by the last value in the first line.


Profile
You can set the profile type/size, or use an asterisk as a wild card.

Material
Material grade can be defined, or an asterisk as a wild card for all material grades.

Rotation

For Polybeams (Type =1):

This value corresponds to the minimum and maximum angle when the profile is rotated around its longitudinal axis. See the image below:

 

Image
unfold_corner_ratios4.png

Tekla Structures will use a range of -180° to 180°. If you specify in the file 0° to 360°, it will not affect the full rotation range of the polybeam. Note that Tekla Structures may automatically change the field in the beam properties dialog box. For example, instead of ‘Top’ (+90° rotation), it may change it to ’Back’.

 

 

 

Image
unfold_corner_ratios5.png

What degrees correspond to what Rotation setting is Tekla Structures?

In terms of the angles that you should put in unfold_corner_ratios.inp, the angles -180° to 180° correspond to some of the Rotation settings in Tekla Structures, as follows:

Top: -180°
Back: -90°
Below: 0°
Front: 90°

Knowing this you could set up your unfold_corner_ratios.inp file so that no matter the orientation of a polybeam made with an angle profile (that is, “L” shape), Tekla Structures measures the length of the polybeam along the base/heel of the angle.

1 L* * -180 -91 2 0 200000 1
1 L* * -90 -1 2 0 200000 1
1 L* * 0 89 2 0 200000 0
1 L* * 90 180 2 0 200000 0


For Plates (Type 2):

The value corresponds to the minimum and maximum thickness of the plate in mm.

The thickness is taken as the horizontal length of the extrema box around the profile. This means that a plate profile which is 200x30 mm, could have several different ‘thicknesses’, depending on its orientation around its longitudinal axis. For example, if it is ‘flat’, then the thickness would be = 200 mm. If it is ‘standing’, then the thickness would be = 300 mm. See the example in Chapter 4.1 for an example of what this means.

What happens with a polybeam with varying plate thicknesses?

Currently, polybeams with varying profiles are not supported in Tekla Structures  (TS18.0 Final).

Flag

• 1 is for sharp fold. Only polybeams with straight chamfers will be affected.
• 2 is for curved bends. Only polybeams with curved chamfers will be affected.

It is important to stress the fact that in real-life situations, polybeams with certain profiles, such as I-beams or CHS/RHS beams, are very unlikely to be manufactured using completely straight/sharp folds. Manufacturers use minimum bending radiuses, and in order to manufacture a straight corner, a special type of process would be required such as hot mould casting or by cutting and welding separate beam parts.

Straight/sharp corners are usually used with plate profiles by Tekla Structures users.


Angle/Radius

• Polybeam with straight chamfers (Flag =1):
The value corresponds to the minimum and maximum angle of the sharp folds.

The angle that is measured is that between the direction of a straight section of the polybeam, and the next section, as shown below. It is not the angle between two straight parts. See the image below.

 

Image
unfold_corner_ratios6.png




What values should I use if I want my polybeams to always be unfolded using the unfold_corner_ratios.inp ratio?

You should use 0 180.

Due to historical reasons, the angles that have been used are -180 to 180. This is no longer necessary. Tekla Structures will always calculate a positive angle, no matter if the beam is turning clockwise or anticlockwise, so only 0 to 180 is needed. Note also that Tekla Structures will not use any value larger than 180. See the image below for details.

 

Image
unfold_corner_ratios7.png



What happens if a polybeam has several bends?

When the polybeam turns many time, Tekla Structures checks each section turn, and unfolds it depending on whether its angle is within the values specified in the unfold_corner_ratios.inp. For example, see the beam below, which has two sections. The first section turns 26.75 degrees. The second section turns 63.43 degrees.

 

 

 

Image
unfold_corner_ratios8.png

 



Now we will show 3 situations.

Situation 1: Beam unfolds completely along inner surface (Ratio = 0).

1 HE* * -180 180 1 0 180 0

Length = 464.59 + 430.90 + 407.29 = 1302.97 mm

Situation 2: Beam unfolds completely along center line (ignores unfold_corner_ratios.inp – see the flowchart above).

1 HE* * -180 180 1 0 25 0

Length = 500 + 559.02 + 500 = 1559.02 mm

Situation 3: Beam unfolds first part along inner surface (angle is between 0-27), but second part along center line (angle >27).

1 HE* * -180 180 1 0 27 0

Note that a common mistake would be to add up the first two inner distances, and then the final center line distance (i.e. 464.59 + 430.90 + 500). But this would be a mistake. The correct procedure would be to imagine the polybeam unfolding by rotating its part through the points specified with the unfold_corner_ratio.inp. In this case, first section will be rotated around the inner surface corner, while the second part around the centre line, as shown by the red circles below.

 

 

 

 

Image
unfold_corner_ratios9.png

 



If we do it in this way, the length can be easily measured measuring the unfolded straight beam, as shown.

Polybeam with curved chamfers (Flag = 2):

The value corresponds to the minimum and maximum radius (inclusive) of curved bends. The radius of the curved bend is the distance between the center of the circle defining the curvature and the center line of the polybeam, as shown below.

 

 

Image
unfold_corner_ratios10.png



If the center line radius of the polybeam is equal to or smaller than the value in unfold_corner_ratios.inp, then the polybeam is unfolded using accordingly; otherwise (if larger), unfold_cornber_ratios.inp is ignored.

What happens if the polybeam has many bends?

Similarly as with polybeam with straight chamfers, when the polybeam turns many times, Tekla Structures checks each section turn, and unfolds it depending on whether its angle is within the values specified in unfold_corner_ratios.inp. See the example under “Polybeam with curved chamfers (Flag = 2)”.

Ratio
This value determines how the polybeam will get unfolded, which in turn determines what its length will be. Specifically, it determines at which depth (perpendicular to the plane of bending/turning), Tekla Structures will unfold the beam. For example, Ratio = 0 means the polybeam will be unfolded along its inner surface (Height = 0). Similarly, 1= outside, 0.5 = center line, etc.

See also 

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