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Dipl.-Ing. (FH) Gerhard Rehm
2019-04-16

Unification Local Axes for Curved Lines or Circles

I have modeled a curved line or a circle, but its axis system has a different length or circumference. What is the reason, and how can I unify the local axes?

Answer:

Depending on the orientation of the lines/members in space, the coordinate systems along the line or member may be different. You can find a detailed definition of the orientation by clicking the link below this FAQ. In order to unify the coordinate system, the line or member must have an identical member rotation. For curved objects, this is only ensured if they are rotated via a help node. For this, select "Inside" as the node number. The plane can be defined using the options "x-y" and "x-z".

Rotation of Line (Left) and Rotation of Member (Right)
Rotation of Line (Left) and Rotation of Member (Right)
Line Rotation = 0 ° (Left), Line Rotation "Inside" (Right)
Line Rotation = 0 ° (Left), Line Rotation "Inside" (Right)
Author

Mr. Rehm is responsible for developing products for timber structures, and he provides technical support for customers.

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Knowledge Base Articles
Illustration of a method for performing stability analysis according to DIN EN 1992-1-1 in RFEM 6
For reinforced concrete components and structures whose structural behavior is significantly influenced by the second-order effects, Eurocode 2 provides the general method based on a nonlinear determination of internal forces according to the second-order analysis (5.8.6), as well as an approximation method based on the nominal curvature (5.8.8).

The aim of this technical article is to perform a design according to the general design method of Eurocode 2, using the example of a slender reinforced concrete column.
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Product Features
Material model Anisotropic | Damage, nonlinear behavior, concrete and reinforced concrete

The "Nonlinear Material Behavior" add-on includes the Anistropic | Damage material model for concrete structural components. This material model allows you to consider concrete damage for members, surfaces, and solids.

You can define an individual stress-strain diagram via a table, use the parametric input to generate the stress-strain diagram, or use the predefined parameters from the standards. Furthermore, it is possible to consider the tension stiffening effect.

For the reinforcement, both nonlinear material models "Isotropic | Plastic (Members)" and "Isotropic | Nonlinear Elastic (Members)" are available.

It is possible to consider the long-term effects due to creep and shrinkage using the "Static Analysis | Creep & Shrinkage (Linear)" analysis type that has been recently released. Creep is taken into account by stretching the stress-strain diagram of the concrete using the factor (1+phi), and shrinkage is taken into account as the pre-strain of the concrete. More detailed time step analyses are possible using the "Time-Dependent Analysis (TDA)" add-on.

Feature 002918 | Determination of Required Longitudinal Reinforcement for Direct Crack Analysis

In the Concrete Design add-on, you can determine the required longitudinal reinforcement for the direct crack width analysis (w k).

Feature 002920 | Automatic Function of Longitudinal Reinforcement for Members

For the design of reinforced concrete members, there is the option to automatically determine the number or diameter of rebars.

Feature 002876 | Reinforcement Results in Tables by Design Situation

For concrete design, you can display the reinforcement results in tables separately by design situation.

Frequently Asked Questions (FAQ)
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