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Frequently Asked Questions (FAQ)
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AnswerFor rod end joints where the reference system is related to the local rod axes, the joint is placed directly on the rod end or rod end. If the joint is to act directly at the node, the reference system must be related to the global axis system.
There are basically two options here:
- The use of rod eccentricities, see technical contribution Consideration of rod and surface eccentricities
- In the case of, for example, differently defined rod end joints in combination with different dimensions of offsets, the use of couplings or rigid rods may help, see Figure 1
In Window 2.2 "Member Loads," you can define the eccentricity of the load by scrolling to the right in the table.
By using a button, you can also graphically select the stress points of a cross-section and thus define the eccentricity on the basis of the cross-section (see figure).
Since program version 5.19, the eccentric load introduction can also be directly considered in RFEM by using the member loads (see Figure 1). The eccentric load introduction can be applied for the "Force" load type.
Alternatively (for example in RSTAB), you can also consider a connection with a rigid member to consider external concentrated loads that act eccentrically on the member. The rigid member is to be connected perpendicularly to the corresponding member. The length of the rigid member corresponds to the amount of the eccentricity (see Figure 2).
Alternatively, you can enter the torsional moment due to the eccentric load introduction as external loading (also for eccentric member loads). Thus, the eccentric action would be considered and the definition of a rigid member would not be necessary (see Figure 3).
AnswerThe Lx and Ly to be defined in the module reflect the Li floor dimension perpendicular to the seismic action. From each individual horizontal force (per FE nodal mass), a torsional moment Mi over -0.05 Li is determined.
Then, the double amount of exported load cases is shown, once with the torsional moment Mi rotating in positive and once in negative direction.
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