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Load Combinations

Actions of loads that act simultaneously are introduced into the analysis with the help of load combinations defined in EN 1990 Basis of Structural Design. The most of the loads is considered as permanent. Surcharges and input forces can be specified as variable load. The program automatically determines the values of individual partial factors depending on whether the given load acts in favor or unfavorably.

By default, the variable loads are considered as major. Nevertheless, the "Verification" and "Dimensioning" frames allow to specify the variable loads as minor - such load is then multiplied by the corresponding coefficient reducing its magnitude. Providing that all loads are considered in the basic combination as minor, the program prompts a warning and the verification is not accepted.

Four types of combinations can be specified in the "Stage settings" frame:

Permanent and transient design situation:

where:

Gk,j

-

characteristic value of jth permanent load

γG,j

-

partial factor of jth permanent load

Qk,i

-

characteristic value of secondary ith variable load

Qk,1

-

characteristic value of primary variable load

γQ,i

-

partial factor of ith variable load

ψ0

-

factor for quasi-permanent value of variable load

Accidental and seismic design situation:

where:

Gk,j

-

characteristic value of jth permanent load

Qk,1

-

characteristic value of primary variable load

ψ1,i

-

factor for frequent value of variable load

ψ2,i

-

factor for combination value of variable load

Ad

-

design value of extreme load

Seismic design situation:

where:

Gk,j

-

characteristic value of jth permanent load

Qk,i

-

characteristic value of secondary jth variable load

ψ2,i

-

factor for quasi-permanent value of variable load

AEd

-

design value of seismic load

Load partial factors and combination coefficients are introduced in the "Partial factors" dialog window.

Input of minor loads

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