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Loads

This window contains options and settings for load input.

Load

The load name and combination type can be specified in this part. The combination type influences the analysis method. These types are available:

Basic design (ULS)

  • The fundamental load type, assumption is that the internal forces are based on basic (or alternative) load combination in accordance with 6.4.3.2 of EN 1990. These loads are analysed for ultimate limit states. Internal forces in these loads are reduced by reduction factor ηfi in the program "Concrete Fire" (described below).

Accidental design (ULS)

  • The assumption for this type is that the internal forces are based on accidental load combination in accordance with 6.4.3.3 of EN 1990. These loads are analysed for ultimate limit states using partial factors for accidental situations.

Characteristic (SLS)

  • The assumption for this type is that the internal forces are based on characteristic load combination in accordance with 6.5.3a of EN 1990. These loads are analysed for serviceability limit states - stress control. Not available in the software "Concrete Fire".

Quasi-permanent (SLS)

  • The assumption for this type is that the internal forces are based on quasi-permanent load combination in accordance with 6.5.3c of EN 1990. These loads are analysed for serviceability limit states - crack control. Not available in the software "Concrete Fire".

Frequent (SLS)

  • The assumption for this type is that the internal forces are based on frequent load combination in accordance with 6.5.3b of EN 1990. These loads may be analysed for serviceability limit states - deflection control. Available only in the software "Concrete Beam".

If the check box "Forces calculated acc. to 2nd order theory", the analysis for this load will be performed without any consideration of buckling (the forces are already calculated on deformed structure.

Force on cross-section

This part contains input fields for internal forces. Following forces are supported:

N

  • Normal force

My

  • Bending moment about axis y (positive values represent tension in the bottom edge of the cross-section)

Mz

  • Bending moment about axis y (positive values represent tension in the left edge of the cross-section)

Vz

  • Shear force in vertical direction (parallel with axis z)

Vy

  • Shear force in horizontal direction (parallel with axis y)

T

  • Torsional moment about member axis 1

The input range depends on program and task type.

Reduction coefficient for design load (only program "Concrete Fire")

Reduction coefficient for the design load ηfi recalculates the load determined for fundamental design combination into the design values for the fire situation. This coefficient should be obtained in accordance with 2.4.2 of EN 1992-1-2. As a simplification, value of ηfi= 0.7 may be used.

Load duration coefficient

This coefficient represents the portion of quasi-permanent component in the design load. Value 0 means that the load doesn't contain any quasi-permanent part, value 1.0 means that complete load is quasi-permanent. This coefficient is important for the calculation of the creep factor.

Proportion of reinforcement to concrete stiffness

This factor is available for design standard EN 1992-2, load types "Quasi-permanent" and "Characteristic". The value represents the ratio of stiffness of reinforcement and concrete. For standard conditions, this ratio is calculated with the help of moduli of elasticity. This solution doesn't respect the degradation of modulus of elasticity of concrete due to creep and similar effects.

Window "Load edit"

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