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RF-CONCRETE Deflect Add-on Module for RFEM
Analytical Deformation Analysis of Plate Structures
The RF-CONCRETE Deflect add‑on module is an extension of the RF‑CONCRETE module group.
RF‑CONCRETE Deflect integrated in RF‑CONCRETE Surfaces allows for a deflection analysis of plate, slab, and elevated slab structures conforming to standard specifications when performing the analytical serviceability limit state design. The deformation analysis can be performed according to the following standards:
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EN 1992‑1‑1:2004 + A1:2014 (requires EC2 for RFEM) -
DIN 1045‑1:2008-08 (requires DIN 1045‑1 for RFEM) -
ACI 318 (requires ACI 318 for RFEM) -
CSA A23.3 (requires CSA A23.3 for RFEM) -
SIA 262 (requires SIA 262 for RFEM) -
GB 50010‑2010: Code for Design of Concrete Structures, 1st edition, July 2011 (requires GB 50010 for RFEM)
With RF‑CONCRETE Deflect, you can quickly and easily perform the design for limiting the deflection of reinforced concrete surfaces by considering different cross‑section conditions of uncracked and cracked concrete (state I and state II).
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Features
- Deformation analyses of reinforced concrete surfaces without or with cracks (state II) by applying the approximation method (for example deformation analysis according to EN 1992-1-1, Cl. 7.4.3 )
- Tension stiffening of concrete applied between cracks
- Optional consideration of creep and shrinkage
- Graphical representation of results integrated in RFEM, for example deformation or sag of a flat slab
- Numerical results clearly arranged in tables and graphical display of the results in the model
- Complete integration of results in RFEM printout report
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Input
The deformation analysis with RF-CONCRETE Deflect can be activated in the settings for the analytical serviceability limit state design in the RF-CONCRETE Surfaces module. You can also specify here the settings for long-term effects (creep and shrinkage) and for tension stiffening between concrete cracks. The creep coefficient and shrinkage strain are calculated using the specified input parameters or defined individually.
You can specify the deformation limit value individually for each surface or for an entire surface group. The allowable limit value is defined by the maximum deformation. In addition, you should determine whether the design applies to a deformed or non-deformed system.
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Design
The deformation analysis according to the approximation method defined in standards (for example deformation analysis according to EN 1992-1-1, 7.4.3) applies to the calculation of so-called effective stiffnesses in the finite elements in accordance with the existing limit state of the concrete with or without cracks. These stiffnesses are used to determine the surface deformation by repeated FEM calculation.
The effective stiffness calculation of finite elements takes into account a reinforced concrete cross-section. Based on the internal forces determined at the serviceability limit state in RFEM, the program classifies the reinforced concrete cross-section as "cracked" or "non-cracked". If the tension stiffening at a section should be considered as well, a distribution coefficient (according to EN 1992-1-1, Eq. 7.19, for example) is used. The material behavior of the concrete is determined as linear-elastic in the compression and tension zone until the concrete tensile strength is reached. This is reached exactly in the serviceability limit state.
When considering the creep and shrinkage, the effective stiffnesses are determined at the "cross-section level". The influence of shrinkage and creeping in statically indeterminate models is not considered by this approximation method (for example, in the case of structures restrained on all sides, tensile forces from shrinkage strain are not determined and have to be considered separately). In summary, RF-CONCRETE Deflect calculates deformations in two steps:
- Calculation of effective stiffnesses of the reinforced concrete cross-section assuming linear-elastic conditions
- Calculation of deformation using the effective stiffness with FEM
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Results
After the calculation, the module shows clearly arranged tables listing the deformation analysis results. All intermediate values are displayed in a comprehensible manner. Graphical representation of design ratios and deformation in RFEM facilitates a quick overview of critical or cracked areas.
Since the design results are displayed by surface or by point including all intermediate results, you can retrace all details of the calculation. The complete integration of results in the RFEM printout report guarantees verifiable structural design.
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Customer Projects
Price
Shrinkage and creep are time-dependent deformation properties of concrete that usually have to be considered in the serviceability limit state design.
- When converting from the manual definition of reinforcement areas to the automatic arrangement of reinforcement according to Window 1.4, the result of the deformation calculation differs, although the basic reinforcement has not been modified. What is the reason for this change?
- Is it possible to perform design without an additional reinforcement 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?
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For the deformation analysis by using RF‑CONCRETE Deflect, I have activated the consideration of creeping and shrinkage. Where can I see the creep coefficient and the coefficient of shrinkage applied for the calculation?
- Which tensile strength of concrete is used for the transition from State I to State II? fctm or fct;0.05?
- Is it possible to define the damage parameter ζ manually for the calculation with RF‑CONCRETE Deflect? In such a way that it should always be at least 0.5?
- Is it possible to display the curvatures or the radius of a slab in the element nodes?
- Is it also possible to graphically display the intermediate values or design details from the calculation in RF‑CONCRETE Surfaces?
- Why do I get such a small amount of reinforcement for the upstand beam? The amount of reinforcement for the downstand beams is significantly larger.
- I do not obtain any deformations in the results of the calculation with RF‑CONCRETE Surfaces. What can be the reason?
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