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Frequently Asked Questions (FAQ)
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The projection plane and the load direction are different parameters and independent of each other.
While the load direction represents the actual direction of the acting load, the projection plane, together with the corresponding coordinates of the load position, describes the plane from which the load's position is projected onto the loaded surfaces.
The graphic to the right in the "Edit Free Rectangular Load" dialog box is used for information purposes, see Figure 1.
In a dynamic analysis, you can only calculate the eigen modes as many degrees of freedom as the system has. With degrees of freedom, the number of mass points multiplied by the number of directions into which the masses act is meant.
A cantilever that is not split by the FE mesh has a mass point at the end. The action direction of the masses in RF-/DYNAM Pro is limited to the X and Y direction. Thus, the system has 2 degrees of freedom, so only 2 eigen-modes can be calculated.
Caution: In this case, the choice of the solution method is very important. In contrast to the "Root of Characteristic Polynomial" method, the Lanczos method can not calculate all eigenvalues of the system, but only n -1, which means in this example only 1 eigenvalue.
For the design with the equivalent member method and the general method, four degrees of freedom are considered in the eigenvalue solver. These are as follows:
When the add-on module RF-/STEEL Warping Torsion is activated, there are seven degrees of freedom:
- uY' (displacement from plane)
- φX' (rotation about the X'-axis)
- φZ' (rotation about the Z'-axis)
- ω (warping)
- ux (displacement in x)
- uy (displacement in y)
- uz (displacement in z)
- φx (rotation about the x-axis)
- φy (rotation about the y-axis)
- φz (rotation about the z-axis)
- ω (warping)
AnswerThe module is designed for prestress in the immediate or subsequent composite. The templates for the tendon geometry are based on parabolic diagrams. This means that the modules are not explicitly designed for the calculation of flat slabs.Possible Figure:The geometric distribution for the free span of the tendon can not be determined automatically by the add-on modules. However, it is possible to use a user-defined tendon diagram as a basis. A prestress without bond could be set by adjusting the friction factors.The deformation analysis can not be performed in the RF-TENDON and RF-TENDON Design add-on modules . However, a deformation analysis on the side of RFEM in conjunction with RF-CONCRETE NL or RF-CONCRETE Deflect and applying the equivalent prestressing loads could be carried out here. The equivalent prestressing loads are exported without influence of long-term losses and would have to be reduced by a factor corresponding to these losses in RFEM.
AnswerThe trigger for this is due to the rod rotation of a rod. A rod rotation can be defined in RFEM and RSTAB via two options:
- Option 1: Rotation by means of angle
- Option 2: Rotation by means of auxiliary nodes
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Unlike the structural elements, it is generally not possible to mark and hide loads by means of selection.In the Display navigator, only loads of the same type (such as Node Loads, Member Loads, Free Polygon Loads, ...) can be activated or deactivated for displaying.Loads are always object-related. If a part of the structure is hidden, the corresponding loads are also hidden.A special feature is the free loads. If they are not explicitly assigned to specific surfaces, they are always displayed - even if the loaded surfaces are hidden. Therefore, it is recommended to assign the free loads only to the corresponding surfaces.The quickest way to do this is to use tables 3.6 - 3.11.Note: For the 2D model types, it is not possible to assign the free loads to special surfaces and they are thus always displayed for the entire structure.
AnswerWith the load generator it is not yet possible to generate the loads for open buildings.You could generate the loads for a closed hall and then manually fill in the missing loads.For free-standing roofs there are other assumptions according to the standard, which are not yet covered in the load generator. There is already an interesting article on the wind load on a freestanding roof on our website.
AnswerFree line loads have no tolerance to surface boundaries. This means that the coordinates of the line load must match those of the line except for the last decimal place, or the line load must be shifted inwards by 1mm, for example.In the example shown in Figure 1, the line load runs exactly between two nodes, which do not have the absolutely same coordinates in the x-direction. Here you can select exactly the nodes via the picking tool in the last dialog.
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