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April 28, 2016

How Do I Get Reactions from Tekla Structures to RISAConnection?

RISAConnection reads from either the Component or the End Conditions for reaction information to populate in the Loading inputs.

Create New Floor Plan button461

Component Loads

RISAConnection accepts the Shear, Tension, and Moment fields for each connection. It will also accept a value in the UDL % field in place of the Shear, V. There is more information on UDL below.

Create New Floor Plan button459

End Conditions

Double-clicking on a member and clicking the User-defined attributes… button and going to the End Conditions allows a user to define end reactions on a member. These end reactions will then be transferred to RISAConnection appropriately. Note that you can use the UDL code  field in place of the Shear, Vy (major). There is more information on UDL below.

Create New Floor Plan button458

Note:

  • If loading is applied to BOTH the component and the end reaction the Component value will be used.
  • The Column Force and Story Shear values are not mapped from Tekla and must be entered manually once in RISAConnection.
  • The Tension/Axial force value in Tekla is positive for tension. In RISAConnection, axial force is negative for tension. The RISA-Tekla Link will switch the sign of the force when transferring to account for this.
  • Any loading that does not have an input in RISAConnection will not be considered in RISAConnection. Weak-axis shear and weak-axis moments are examples of this.

 

UDL % (Uniform Distributed Loads)

The UDL % is a way to have the link calculate the design shear forces on a beam in your model. This is done considering the AISC 14th edition manual Tables 3-6, 3-7, 3-8 and 3-9 for wide flanges and channels. These tables have a Wc/Ωb for ASD and a φWc for LRFD and units of kip-ft. Using the length, L, and the UDL % input the shear force calculation is as follows:

VASD = (UDL %) * ( Wcb) / 2L                            VLRFD = (UDL %) * (φWc) / 2L

 

This value is what will be brought into RISAConnection in the Shear Load field in RISAConnection.

Create New Floor Plan button460

Note:

  • UDL % is not supported for shapes other than wide flanges and channels in the AISC 14th edition manual.
  • This field is only used for shear forces in beams and will be ignored if used in any other conditions.
  • If a UDL % value is given in combination with a strong direction shear force (Vy, major) the program will use the shear force and ignore UDL %.
  • The default code selected in RISAConnection is the AISC 14th (360-10): ASD, thus this initial transfer will always use the ASD value for the UDL % calculation. If you are using LRFD codes you’ll need to edit this in RISAConnection and roundtrip the model to get back into RISAConnection with the proper loading.


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This entry was posted by RISA News on Thursday, April 28th, 2016 at 10:54 am and is filed under Technical Solutions. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

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