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Frequently Asked Questions (FAQ)
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AnswerThe individual members of a set of members must have an identical orientation. Furthermore, the orientation of the members and the set of members must match.Solution:In the Display navigator, you can display and check the orientation of members and sets of members. Use the shortcut menu to invert the Orientation of a member or set of members (see Figure 03)
AnswerUnfortunately, the add-on module RF-CONCRETE Surfaces for RFEM 5 is not designed for the design of sandwich elements. Therefore, there are no essential designs for structural components like For example, the shear joint check. Regardless of whether it is a wall or a slab.The bending design, and in particular the check of the shear force resistance, is designed for constant cross-sections.You can model the sandwich elements as surfaces with a constant thickness and perform the design in RF-CONCRETE Surfaces. If necessary Additionally required designs would have to be performed separately.
AnswerThe add-on module RF-CONCRETE Deflect is available for the calculation of state II deformations in RF-CONCRETE Surfaces.For the analytical calculation of deformations in state II, RF-CONCRETE Deflect requires a unique load situation, which is given only by using the load combinations (COs). Result combinations do not offer a clear load situation, whether additive or as an enveloped OR combination. Therefore, when applying the RC for the calculation of deformations in RF-CONCRETE Surfaces by RF-CONCRETE Deflect, you receive the mentioned error message. See Figure 01.To avoid this problem, you can simply generate load combinations (COs) instead of result combinations (RCs). If you still want to perform the ultimate limit state design with RC's, you can create a CC for each in addition to the existing RCs for which you want to calculate the deformations by means of RF-CONCRETE Deflect. See Figure 02.It is important that RF-CONCRETE Surfaces calculates the loads from the quasi-permanent design situation by default for the calculation of the deformations. See Figure 03. This means that the CO for which the deformations are to be calculated must be defined as "quasi-permanent." Alternatively, the check boxes for the settings of the design situations (see Figure 03) can be user-defined.
AnswerThe sets of members to be designed in the add-on module must be based on the same or uniformly running cross-section.A special feature is a set of members consisting of ribs. This results in an identical cross-section only if the integration width of the rib is selected to be the same. Thus, there must be a uniform rib type for the entire set of members.Tapered sets of members are only designed if the entire set of members is linear
Has cross-sectional shape.
If one or more members with a circular cross-section have been dimensioned, A s, above and A s, are no longer indicated below: "Top" and "bottom" can not be defined for this cross-section; the reinforcement is inserted "peripherally".
Solution: Create a separate design case for the circular cross-sections (select the "File → Add New Case" module menu) and design the corresponding members separately. In the other design case, you delete the members with circular cross-sections. After the design, A s, top and A s are displayed at the bottom of the Results navigator.
AnswerIn most cases, these new elements only have to be added in the relevant add-on module. In Figure 1, you can see that the tick for "all" is not set and therefore new elements have to be added manually.
AnswerNo, no basic reinforcement defined in RF-CONCRETE Surfaces is considered in the determination of internal forces in RFEM. In RFEM, the internal forces are determined with the modulus of elasticity of the selected concrete. The reinforcement amount has no influence (linear-elastic calculation, state I).The situation is different if you perform a nonlinear design in the serviceability limit state state II with the RF-CONCRETE NL add-on module. Here, you specify an available basic reinforcement that you want to consider for the nonlinear calculation in state II. In nonlinear design (available only for SLS), the determination of internal forces is carried out with the effective stiffnesses (state II). Thus, the defined reinforcement has an influence on the internal forces.You can evaluate these internal forces (from state II with the influence of the defined reinforcement) in the results of RF-CONCRETE Surfaces. See Figure 01 with the Results navigator of the RF-CONCRETE Surfaces add-on module.
With the COM interface, you can access most operating elements as well as results of the following programs or add-on modules:
- RF- / STEEL EC3
- RF- / CONCRETE
- RX-TIMBER Glued-Laminated Beam
- RF-/TIMBER Pro
- RF- / DYNAM Pro
AnswerThere are several ways to check the effective widths of the ribs graphically.Among other things, directly when entering the rib in RFEM, see Figure 1.In the RF-CONCRETE Members add-on module, the cross-section graphic is displayed below ribs of Table 1.4. The graphic shows the equivalent cross-section used for the design, see Figure 2.The Reinforcement - Rendering option in the Project Navigator - Results option allows you to display the member, the rebars, and the stirrups in the RFEM work window, see Figure 3.
AnswerNo, this is unfortunately not possible.The program concept of RF-CONCRETE Surfaces is designed in such a way that it is always necessary to place a reinforcement on the top and bottom layer.If necessary you can try to concentrate the individual reinforcement layers in the center of the surface. However, make sure that the individual reinforcement layers do not "touch" each other. Otherwise, an error message appears. See Figure 01.
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