[CIM/Rebar] Select Member Edge(Rebar Type) Rule

Question 

I am curious about the principle of the Select Member Edge function.

Answer 

Select Member Edge draws line-based reinforcing bars, Draws with reference to the intersection point extending to two unconnected edges.

Figure. 1 Select Member Edge Example

As shown in Figure 1, when the tapered array operates in the case where the edges to be referenced by the reinforcing bars are not continuous, it is difficult to form the desired rebar group only by using the draw point.
(Rebar Array Group Creation Rule according to Transverse Rebar Draw Point View technical document together.)

Therefore, a Rebar Type that follows the shape based on Edge and Vector information is required, and
Select Member Edgeplays this role.

The shape information to be defined in Select Member Edge is as follows.

There are four pieces of information to define the shape of Select Member Edge as follows.
(Except for geometric information defined in Property Tab)

• Reference Edge : Edge to be referenced when reinforcing bars are drawn
• Edge order : Reference Edge reference order (Reinforcing bars are drawn in the selected order.)
• Vector : The vector where the rebar draw will be performed on the selected edge
• Direction : Whether or not the direction in which the reinforcing bars are drawn based on the corresponding edge is inside/outside

In order to enter accurate information, it is necessary to understand the user behavior and principle of the Select Member Edge function first.

The method of receiving information is explained in detail through the example of the user's action when drawing the rebar in Figure 1.

Figure. 2 Haunch Rebar Draw/p>

Figure 2 is an image of completing the Draw by adjusting the length of the reinforcing bar end after receiving the shape information at each edge by clicking the mouse.
This is an image of rebar drawn by inputting all of the Select Member Edge shape information described above. can.

A brief summary of the content and definition method for each piece of information,

1. Reference Edge / 2. Edge’s sequence

Figure. 3 Select Reference Edge

Edge to be referenced is defined with a mouse click. Since the rebars are drawn in the order you define, you need to clarify the order in which the rebars are drawn.

Figure. 4 Reinforcing bar modeling results according to the order of edge - 1	Figure. 5 Rebar modeling results according to the order of edge - 2

As shown in the figure above, the result varies depending on the order in which Edges are selected.

3. Vector

Figure. 6 Vector Determination Method

In the Select Member Edge function, it is important to define a vector suitable for the direction of progress and draw reinforcing bars.
At this time, Vector exists only in +/- directions, and the symbol changes where the Draw will proceed depending on the direction from the center point of the edge to be selected. (Figure 6)

User Error that occur frequently during Vector definition.

Figure. 7 Preview of normal vector (Point = center point of outer wall edge)	Figure. 8 Preview of wrong Vector (Point = Rebar Bending Point)

When the overall edge length is long and the center point is somewhat far from the drawn rebar, as shown in Figure 8, if you press down from the bending point (intersection of the line that extends the edge), the last section of the rebar will go down. You can be mistaken.

In the preview of the rebar, it should be recognized that the direction from the center point of the edge is received as information, not the vector of the reinforcing bar from the point to be bent

4. Direction

Figure. 9 Direction decision method

As shown in Figure 9, the direction is determined depending on whether the mouse-over position is inside/outside based on the edge. (Figure 9)

Figure. 10 Rebar modeling result according to direction (inside edge)	Figure. 11 Rebar modeling result according to direction (outside of edge)

If you proceed with rebar modeling based on your understanding of the above, you can obtain the desired shape result in various cases.