The number of National Annexes for Eurocode 2 with regard to the design of reinforced concrete cross-sections has been extended since SHAPE-MASSIVE 6.54. Therefore, the following NAs of EN 1992-1-1:2004 + AC:2010 are available:
The wind loads are regulated according to Eurocode 1 - Actions on Structures - Part 1-4: General actions - Wind loads. The nationally determined parameters of a respective country can be found in the National Annexes.
The efficient design of prestressed structural components requires a few additional steps that go beyond the standard reinforced concrete design, from modeling tendons to the calculation of equivalent loads to the cross-section resistance design. Therefore, it is important that the software for prestressed concrete design is structured and the navigation is possible in the program. RFEM 5, with two add-on modules, RF-TENDON and RF-TENDON Design, fulfills these requirements and allows engineers to carry out the complete design of prestressed beams, frames, plates, buildings, and bridges according to EN 1992‑1‑1 with National Annexes and SIA 262.
This post describes two practical examples, based on the Eurocodes, where the reduction of combinations is reasonable. There are a large number of various National Annexes as well as several material standards (EC 2 to EC 9) that are not in compliance with the rules for structural design (EC 0).
RFEM and RSTAB provide the option to create national annexes with user-defined partial safety factors and combination coefficients. They can also be transferred to other computers.
If you want to design structural components in an RFEM or RSTAB add‑on module, several National Annexes are available in some add‑on modules. In the case of structures that are to be analyzed mainly according to a specific National Annex, the add‑on modules provide the option to set a default value. Thus, it is unnecessary to select the NA again for each new model.
RFEM and RSTAB provide the option to create load and result combinations automatically according to the combination expressions defined in the standards. Partial safety factors and combination coefficients are specified in the standards or National Annexes. You can customize them as necessary and save them in a modified standard.
The national parameters of EN 1992‑1‑1 for each country can be exported from RF‑/CONCRETE, RF‑/CONCRETE Columns, and RF‑/FOUNDATION Pro. To do this, there are interfaces with MS Excel, OpenOffice, and CSV. By exporting the national parameters, you can edit them in (for example) MS Excel, and display possible differences between the individual National Annexes clearly (see the image).
In order to meet the requirements for the parameters of special buildings modified according to standard adjustments, you can create new National Annexes from an existing one. To do this, copy the National Annex and adjust the parameters to the requirements.