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Useful Program Features
The Knowledge Base includes technical articles on a wide array of structural analysis and design topics.
These articles are intended to help you navigate through the Dlubal programs, learn efficient tips and tricks, and provide further insight into the program features.
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Designing Reinforced Concrete Compression Elements Subjected to Biaxial Bending with the Nominal Curvature Method
Daily tasks in reinforced concrete design also include designing compression elements subjected to biaxial bending. The following article describes the different methods according to Chapter 5.8.9, EN 1992-1-1, which can be used to design compression elements with biaxial load eccentricities by means of the nominal curvature method according to 5.8.8.
With RF-FOUNDATION Pro, it is possible to determine settlements of single foundations and resulting spring stiffnesses of the nodal supports. These spring stiffnesses can be exported into the RFEM model and used for further analyses.
Influence lines have become less important nowadays due to the fast computer systems. However, it might be an advantage to use influence lines in the phase of preliminary design, but also in the actual creation of the structural designs. With the RF-INFLUENCE add-on module, it is possible to generate and evaluate influence lines and influence surfaces easily due to a fixed internal force. This technical article describes with a simple example the basics to determine and evaluate influence lines.
Design loads specified in the AASHTO Bridge Design Specification are available in the RF‑MOVE Surfaces moving load library. Design Truck (HS‑20), Tandem, Type 3, and Overload are available options.
Combinatorics for Road Bridge Construction According to EN 1990 + EN 1991-2: Specification of Load Cases in Action Category gr1 to gr5
If you select the combinatorics according to EN 1990 + EN 1991‑2 and define a load case in the action category gr1a, gr2, or gr5, you have to additionally define in the program which load model should be taken as a basis for the load case. This information is crucial for defining combination rules for automatic combinatorics according to EN 1990 + EN 1991‑2. In the gr1a category, you can select TS (LM1), UDL (LM1) or pedestrian and cycle track, for example. TS (LM1) is preset by default. In the gr2 category, it is possible to select breaking and acceleration forces or centrifugal forces as a specification.
For the reduction of loads generated in RF‑MOVE Surfaces, it is possible to consider influence surfaces of a selected point. The influence surfaces are determined by RF‑INFLUENCE. This procedure is useful in cases where only unfavorable acting loads should be considered. Depending on the unfavorable action, you should select the positive or negative direction.
Moving loads can be easily generated with RF‑MOVE Surfaces. A library is available with load models as defined in the Eurocode 1, Part 2. The input of step size, offsets at start and end, and the distance to a reference line makes it possible for the user to generate user‑defined load models and also influence the number of generated load cases. RF‑MOVE Surfaces generates load cases and optional also a result combination as envelope of all results.
The determined values for the influence ordinates are displayed as decimal numbers with up to six decimal places by default.
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