RF-/STAGES Add-on Module for RFEM/RSTAB
Consideration of Construction Stages in RFEM/RSTAB
The RF-/STAGES add‑on module allows for design of beam structures (also surface and solid structures in RFEM) considering the construction stage during the building phase.
Negligence of the construction stage influence may cause errors in the calculation of entire models. RF‑/STAGES analyzes these influences and considers them to the point of the structural design.
- Simple definition of construction stages in the RFEM/RSTAB structure including visualization
- Addition, removal, and modification of member, surface and solid properties (such as member hinges, surface eccentricities, degrees of freedom for supports, and others)
- Optional superposition of construction stages with additional temporary loads, for example mounting loads or mounting cranes, and others
- Consideration of nonlinear effects such as failure of a tension member, elastic foundations, or nonlinear supports
- Numerical and graphical result display for individual construction stages or as an envelope (Max/Min) of all construction stages
- Detailed printout report including all structural and load data of each construction stage
After creating the entire structure in RFEM/RSTAB, the individual structural components as well as load cases and combinations are assigned to the corresponding construction stages. For each construction stage, you can modify for example release definitions of members and supports.
Thus, it is possible to model structural modifications, as they occur by successive grouting of bridge girders or by settling of columns. The load cases and load combinations already created in RFEM/RSTAB are divided into "Permanent Loading" and "Temporary Loading" in the add-on module.
The defined temporary loads are superimposed by permanent loads. In this way, it is possible to determine the maximum internal forces of different crane positions or to consider temporary mounting loads available only in one construction stage.
The calculation of the "Permanent Loads" is performed in compliance with the large deformation analysis successively for each construction stage.
Resulting geometry differences between the ideal and the deformed structural system from the previous construction stage are compared in the background. The next construction stage is based on the structural system stressed from the previous construction stage.
After the calculation, it is possible to evaluate the results of each construction stage directly in the module window or graphically in the RFEM/RSTAB model. In this case, you can export the results to RFEM/RSTAB.
The module creates result cases of each construction stage as well as an enveloping "combination" including the maximum and minimum values of all construction stages. You can use the result cases and the enveloping combination for further calculations in various RFEM/RSTAB add-on modules.
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The current state of the development of finite element analysis software and computer technology allows for the calculation of more complex structure. More and more frequently, the FE calculation is performed on the entire model. In this context, certain practical construction problems may appear. One of these problems is the consideration of a construction process in the model.
In my model, I have to consider construction stages with nonlinearities, so I have to work with the load combinations that are already included in the dead load.
I have several load combinations for the first and then also for the second construction stage to be analyzed and evaluated.
The load combinations from the first construction stage do not occur in the second construction stage.
I am not sure how to assign the load combinations in the construction stages (permanent or temporary).
- How can I display the deformation in the current construction stage and in relation to the initial system in RF‑STAGES?
- Why are the results of the load cases,for example, the load case of dead load, not identical with the first construction stage in the RF‑/STAGES add-on module?
- When comparing the partial calculation of a single floor with the total calculation of the building, there are very different local deformations. Why?
- Why are the results in the RF‑/STAGES add-on module not consistent with the corresponding load cases and combinations in the program RFEM or RSTAB?
- What means the option Alignment of new elements in "Initial position" and "Tangential" in RF‑STAGES?
- In the RF‑STAGES module, I get a message about instability. RFEM calculates the model without any problems. How can I solve this?
- Which analysis is used in RF‑STAGES or STAGES to calculate temporary loads and the generated combinations?
- Can I calculate or measure composite cross-sections with RFEM concrete-concrete?
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