| Actions, Design Situations
The corresponding actions are simply mapped to the load cases by the user. The program then automatically creates the decisive design values for the ultimate limit state and serviceability limit state while considering the safety factors and combination coefficients. For each combination different design situations can be defined for the construction and end states. When conducting the check, the extreme values deriving from all combinations and situations applies. Optionally, the checks can be carried out for all possible combinations of internal forces.
The following tables list the available checks including references to the chapters of the applicable standards.
Ultimate Limit State Checks
|
B4700 |
B4750 |
B4753 |
| Minimum reinforcement against failure without warning |
- |
12.5 |
12.5 |
| Normal force, bending moment (N, M, N and M) |
3.4.2 |
12.2 |
12.2 |
| Lateral force under consideration of the minimum level of reinforcement |
3.4.4 |
12.3 |
12.3 |
| Torsion |
3.4.6 |
12.4 |
12.4 |
| Punching shear |
3.4.5 |
- |
- |
| Fatigue of longitudinal reinforcement, shear reinforcement and prestressing steel |
- |
- |
13.3-4 |
| Fatigue of concrete under compressive stress |
- |
- |
13.2 |
| |
|
|
|
Checks at the Serviceability Limit State
|
|
|
|
| Limiting the concrete compressive stresses |
- |
11.4.5 |
11.4.2 |
| Limiting the reinforcing and prestressing steel stresses |
- |
11.4.5 |
11.4.2 |
| Check of decompression |
- |
11.3 |
11.3 |
| Crack dispersing minimum reinforcement |
4.2.2 |
11.5 |
11.5 |
| Limiting the crack width |
4.2.3 |
11.5 |
11.5 |
| Limiting deformations |
4.3 |
11.6 |
11.6 |
Ultimate Limit State
The dimensioning of the reinforcement is performed separately on a per checks basis for the modeled design situations. This is determined individually for each combination of internal forces. The final outcome is a result of the extreme value derived from all calculated reinforcements. In the check against fatigue, the reinforcement that was previously determined is, if necessary, increased iteratively until the required stress range is met.
Serviceability
If required, the checks are carried out in state II under consideration of the calculated maximum reinforcement. In order to attain the required crack width, the minimum reinforcement is increased, if necessary.
| Situation |
Load Capacity |
Serviceability |
Fundamental combination
Accidental |
Longitudinal reinforcement
Lateral reinforcement
Torsional reinforcement
Punching shear |
|
Rare,
Characteristic |
|
Concrete compressive stress
Reinforcing steel stress
Prestressing steel stress
Decompression class A
Crack width class B |
Frequently
Fatigue |
Robustness reinforcement
Reinforcing steel fatigue
Prestressing steel fatigue
Concrete fatigue |
Decompression class B
Crack width class C, D |
| Quasi-continuous |
|
Concrete compressive stress
Prestressing steel stress
Decompression class C
Crack width class E
Deformations |
Results
The calculated reinforcement can be output graphically (contours, color gradient, section or numerically) or in table form. This can be selected either for individual checks or for the entire reinforcement. The checks are documented in a detailed log.
Literature
ÖNORM B 4700 (2001)
Reinforced concrete structures - EUROCODE-oriented analysis,
design and detailing, publication 2001-06-01,
Österreichisches Normungsinstitut (ON), Vienna 2001.
ÖNORM B 4750 (2000)
Prestressed concrete structures - EUROCODE-oriented analysis,
design and detailing, publication 2000-11-01,
Österreichisches Normungsinstitut (ON), Vienna 2000.
ÖNORM B 4753 (2003)
Prestressed concrete railroad bridges - EUROCODE-oriented analysis,
design and detailing, publication 2003-06-01,
Österreichisches Normungsinstitut (ON), Vienna 2003.
Examples of the use of the ÖNORM B 4700 (1995)
„Reinforced steel structures. EUROCODE-oriented analysis, design and
detailing', as of 1 October 1995,
Österreichisches Normungsinstitut (ON), Vienna 1995. |
Actions and design situations
Definition of effective actions
Check selection
Lower reinforcement with selected gradation
Entry dialog for the punching shear check
|
