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CONCRETE Add-on Module for RSTAB
Linear and Nonlinear Analysis of Reinforced Concrete Members with Reinforcement Concept
CONCRETE is an RSTAB add‑on module for reinforced concrete design of member elements. It provides options for the evaluation of RSTAB internal forces in various design cases. In this way, it is possible to quickly calculate alternative designs using different concrete strength classes or modified cross‑sections.
The design is carried out for uniaxial and biaxial bending with axial force as well as shear and torsion. The corresponding extensions enable the design according to the following standards:
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EN 1992-1-1:2004 + A1:2014 (requires EC2 for RSTAB) -
DIN 1045‑1:2008-08 (requires DIN 1045‑1 for RSTAB) -
ACI 318 (requires ACI 318 for RSTAB) -
CSA A23.3 (requires CSA A23.3 for RSTAB) -
SIA 262 (requires SIA 262 for RSTAB) -
GB 50010‑2010: Code for Design of Concrete Structures, 1st edition, July 2011 (requires GB 50010 for RSTAB)
Optionally, it is possible to perform fire resistance design for rectangular and circular cross‑sections according to:
- EN 1992‑1‑2:2004 (requires EC2 for RSTAB)
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Features
- Import of results from RSTAB
- Integrated material and cross-section library
- The module extension EC2 for RSTAB enables design of reinforced concrete according to EN 1992-1-1 (Eurocode 2) and the following National Annexes:
- DIN EN 1992-1-1/NA/A1:2015-12 (Germany)
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ÖNORM B 1992-1-1:2018-01 (Austria) 
NBN EN 1992-1-1 ANB:2010 for design at normal temperature, and EN 1992-1-2 ANB:2010 for fire resistance design (Belgium)
BDS EN 1992-1-1:2005/NA:2011 (Bulgaria)-
EN 1992-1-1 DK NA:2013 (Denmark) -
NF EN 1992-1-1/NA:2016-03 (France) -
SFS EN 1992-1-1/NA:2007-10 (Finland) 
UNI EN 1992-1-1/NA:2007-07 (Italy)
LVS EN 1992-1-1:2005/NA:2014 (Latvia)
LST EN 1992-1-1:2005/NA:2011 (Lithuania)
MS EN 1992-1-1:2010 (Malaysia)
NEN-EN 1992-1-1+C2:2011/NB:2016 (Netherlands)-
NS EN 1992-1 -1:2004-NA:2008 (Norway) 
PN EN 1992-1-1/NA:2010 (Poland)
NP EN 1992-1-1/NA:2010-02 (Portugal)
SR EN 1992-1-1:2004/NA:2008 (Romania)
SS EN 1992-1-1/NA:2008 (Sweden)
SS EN 1992-1-1/NA:2008-06 (Singapore)
STN EN 1992-1-1/NA:2008-06 (Slovakia)
SIST EN 1992-1-1:2005/A101:2006 (Slovenia)
UNE EN 1992-1-1/NA:2013 (Spain)
CSN EN 1992-1-1/NA:2016-05 (Czech Republic)
BS EN 1992-1-1:2004/NA:2005 (United Kingdom)
CPM 1992-1-1:2009 (Belarus)
CYS EN 1992-1-1:2004/NA:2009 (Cyprus)
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- Optional presetting of partial safety factors, reduction factors, neutral axis depth limitation, material properties, and concrete cover
- Determination of longitudinal, shear, and torsional reinforcement
- Design of tapered members
- Cross‑section optimization
- Representation of minimum and compression reinforcement
- Determination of editable reinforcement proposal
- Crack width analysis with optional increase of the required reinforcement in order to keep the defined limit values of the crack width analysis
- Nonlinear calculation with consideration of cracked cross‑sections (for EN 1992‑1‑1:2004 and DIN 1045‑1:2008)
- Consideration of tension stiffening
- Consideration of creep and shrinkage
- Deformations in cracked sections (state II)
- Graphical representation of all result diagrams
- Fire resistance design according to the simplified method (zone method) according to EN 1992‑1‑2 for rectangular and circular cross‑sections. Thus, fire resistance design of brackets is possible as well.
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Input
After opening the program, you can define the standard and method according to which the design is performed. The ultimate and the serviceability limit state can be designed according to the linear and the nonlinear calculation method. Load cases, load combinations or result combinations are assigned to different calculation types then. In other input windows, you can define materials and cross‑sections. In addition, it is possible to assign parameters for creep and shrinkage. Creep and shrinkage coefficients are directly adjusted, depending on the age of the concrete.
Support geometry is determined by means of design‑relevant data such as support widths and types (direct, monolithic, end, or intermediate support), redistribution of moments as well as shear force and moment reduction. CONCRETE recognizes the support types from the RSTAB model automatically.
A segmented window includes the specific reinforcement data such as diameters, the concrete cover and curtailment type of reinforcements, number of layers, cutting ability of links and the anchorage type. In the case of the fire resistance design, it is necessary to define the fire resistance class, the fire‑related material properties as well as the cross-section side exposed to fire. Members and sets of members can be summarized in special "reinforcement groups", each defined by different design parameters.
You can adjust the limit value of the maximum crack width in the case of crack width analysis. The geometry of tapers is to be determined additionally for the reinforcement.
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Design
Before the calculation starts, you should check the input data using the program function. Then, the CONCRETE add‑on module searches the results of relevant load cases, load as well as result combinations. If these cannot be found, RSTAB starts the calculation to determine the required internal forces.
Considering the selected design standard, the required reinforcement areas of the longitudinal and the shear reinforcement as well as the corresponding intermediate results are calculated. If the longitudinal reinforcement determined by the ultimate limit state design is not sufficient for the design of the maximum crack width, it is possible to increase the reinforcement automatically until the defined limit value is reached.
The design of potentially unstable structural components is possible using a nonlinear calculation. According to a respective standard, there are different approaches available.
The fire resistance design is performed according to a simplified calculation method in compliance with EN 1992‑1‑2, 4.2. The module uses the zone method mentioned in Annex B2. Furthermore, you can consider the thermal strains in longitudinal direction and the thermal precamber additionally arising from asymmetrical effects of fire.
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Results
After the calculation, the module shows clearly arranged tables listing the required reinforcement and the results of the serviceability limit state design.
All intermediate values are included in a comprehensible manner. In addition to the tables, current stresses and strains in a cross‑section are represented graphically.The reinforcement proposals of the longitudinal and the shear reinforcement including sketches are documented in accordance with current practice. It is possible to edit the reinforcement proposal and to adjust for example the number of members and the anchorage. The modifications will be updated automatically.
A concrete cross‑section including reinforcement can be visualized in a 3D rendering. In this way, the program provides an optimal documentation option to create reinforcement drawings including steel schedule.
Crack width analyses are performed using the selected reinforcement of internal forces in the serviceability limit state. The result output covers steel stresses, the minimum reinforcement, limit diameters, the maximum bar spacing as well as crack spacing and the maximum crack widths.
As a result of the nonlinear calculation, there are the ultimate limit states of the cross‑section with defined reinforcement (determined linear elastically) as well as effective deflections of the member considering stiffness in cracked state.
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| Manual CONCRETE |
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Book about FEM and RFEM
In this book for engineers and students, you will learn the basics of the finite element method in a practical way by means of manageable examples that have been calculated with RFEM.
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New
RF-CONCRETE Members for RFEM or CONCRETE for RSTAB propose an automatically created reinforcement to the user, if the ‘Design the provided reinforcement’ option is selected in Window 1.6 ‘Reinforcement’.
Before the calculation starts, you should check the input data using the program function. Then, the CONCRETE add‑on module searches the results of relevant load cases, load as well as result combinations. If these cannot be found, RSTAB starts the calculation to determine the required internal forces.
Considering the selected design standard, the required reinforcement areas of the longitudinal and the shear reinforcement as well as the corresponding intermediate results are calculated. If the longitudinal reinforcement determined by the ultimate limit state design is not sufficient for the design of the maximum crack width, it is possible to increase the reinforcement automatically until the defined limit value is reached.
The design of potentially unstable structural components is possible using a nonlinear calculation. According to a respective standard, there are different approaches available.
The fire resistance design is performed according to a simplified calculation method in compliance with EN 1992‑1‑2, 4.2. The module uses the zone method mentioned in Annex B2. Furthermore, you can consider the thermal strains in longitudinal direction and the thermal precamber additionally arising from asymmetrical effects of fire.
- How do you define the descriptions of various reinforcement results,such as the required reinforcement?
- How are the creep and shrinkage for columns considered in RF‑CONCRETE Members?
- How can I display the vertical deformation of a column in state II? I cannot find this setting for the serviceability limit state design.
- Is the preset crack width of, for example, wk = 0.3 mm also designed for primary cracks? According to the manual, the average strain is considered. Does this ensure that the primary crack does not exceed the value wk = 0.3 mm?
- For the design of a ring beam, I usually have Mz moments, which causes the formation of the compression and tension zone on the right and left of the cross-section. However, the reinforcement in CONCRETE is arranged at the top and bottom of the cross-section. How can I set the reinforcement to be arranged on the right and left?
- When calculating deformations in RF‑CONCRETE Members, I get jumps in the deformation diagram. Why?
- Why can I no longer display the intermediate results in RF‑CONCRETE Members?
- Can I use RF‑CONCRETE Surfaces to determine the steel mass for the inserted reinforcement?
- In connection with the analytical SLS calculation, I get implausibly large values for the crack width and deformation in the RF‑CONCRETE add-on modules. What is the cause and how can I fix the problem?
- How do I find the non-designable locations in the work window?
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