Cruciform Pattern

Cruciform Pattern

 

The design to EC2 using the cruciform pattern looks similar to the circular pattern design. The whole design methodology described in sections 3 to 9 is valid for cruciform pattern designs.

 

a) Arranging rails and studs

 

The key difference appears in the rails arrangement. As the cruciform pattern has no diagonal rails, the procedure of locating u_{out ef} looks slightly different. With the length of u_{out ef} we can locate the u_{out ef} perimeter. The minimum distance between the u_{out ef} perimeter and the centre point of the loaded area can be calculated using the following expression:

p_{c min} = u_{out ef}/8 - d•(3π/8 - 0.5 - √2)

The number of studs is given by the formula below (the value should be rounded up to the nearest integer):
n_tc = (p_{c min} - c₁₍₂₎ /2 - distance to first stud - 1.5d)/0.75d + 1

 

The minimum distance (F) between the first and last rail on each side of the loaded area may be calculated using the following expression:
F = u_{out ef} /4 - 0.75• π •d - 2d

The Distance F should be infilled with rails taking into account the 1.5d spacing rule between
rails. The drawing below illustrates the points above.
When

 

 

When all the rails are set, the final step is to calculate the required area of stud. The equations are identical to those for circular pattern designs (see section 8b for details).

 

Please note that only the rails with the first stud at 0.3•d to 0.5•d from the loaded area face and the last stud at 1.5•d from the u_{out ef} perimeter (shown in green above) can be taken to account when calculating the area of the stud (i.e. in the drawing above only 8 rails can be taken to account).

 

 

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LinkStudPSR

https://linkstudpsr.com/uploads/downloads/linkstud-PSR-Design-Manual-ltd-EC2-v3.2sm__1010221116.pdf