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FAQ 003404 | In RF‑CONCRETE Surfaces, I obtain a high amount of reinforcement in relation to a lever arm that is almost zero. How is such a small lever arm of internal forces created?
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In RF‑CONCRETE Surfaces, I obtain a high amount of reinforcement in relation to a lever arm that is almost zero. How is such a small lever arm of internal forces created?Answer
The situation could be caused by the following conditions:
- The reinforcement layers are virtually adjacent to each other in the neutral axis of the surface.
- You have selected a smaller rebar diameter.
- The cross-section is completely drawn, that is, there is no neutral axis depth.
In this case, the smallest distance between the reinforcement layers is applied as a lever arm. If it is close to zero, the lever arm is also set as close to zero.
Keywords
Dlubal FAQ Lever arm Inner Force Concrete cover Reinforcement layer Frequently Asked Question FAQ about Dlubal Question and Answer about Dlubal
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According to Book 631 of the DAfStb (German Committee for Structural Concrete), Chapter 2.4, the structural behavior of ceilings changes if their continuous support by walls is interrupted in areas of openings.
Material Model Orthotropic Masonry 2D
The material model Orthotropic Masonry 2D is an elastoplastic model that additionally allows softening of the material, which can be different in the local x- and y-direction of a surface. The material model is suitable for (unreinforced) masonry walls with in-plane loads.
- When determining internal forces in RFEM, I obtain compression axial forces that do not arise in the design internal forces in the design in RF‑CONCRETE Surfaces. Why, what is the reason?
- When designing a plate, I get different reinforcements in different load situations with the same bending stress. Why?
- Regarding a nonlinear analysis of reinforced concrete, is there any feature in the program that increases the load until failure? Or is there any way how to describe the load increment until failure?
- Is it possible to design bidirectional ribbed plates, unidirectional ribbed plates, or hollow core slabs in RFEM?
- Is it possible to enter and design a reinforced concrete surface with a reinforcement layer in the center of the surface?
- Is it also possible to perform a deformation analysis in cracked state for a 2D model in RF‑CONCRETE Surfaces?
- I obtain different results when comparing the deformation analysis in the RF‑CONCRETE add-on modules and another calculation program. What could be the reason for this?
- In the add-on module RF-CONCRETE Surfaces, is it possible to limit crack widths due to internal restraint and with customized fct,eff?
- Is it possible to design a model with a pile foundation in RFEM?
- Why is the button of "Design Details" not active in RF‑CONCRETE Surfaces?
