Example

Example for Envelopes

Let’s assume a continuous beam of two spans. The beam is subject to load sorted into five load cases.

LC1 – permanent – self weight, distributed load in both spans

LC2 – variable – distributed load in the left span, load group G1

LC3 – variable – distributed load in the right span, load group G1

LC4 – variable – crane, concentrated force in the middle of the left span, load group G2

LC5 – variable – crane, concentrated force in the middle of the right span, load group G2

The variable load cases are divided into two groups:

G1 – imposed floor load, standard group

G2 – crane, exclusive group, only one of the load cases may be acting at the same time

The user defines the following envelopes:

LC1 + 1.2*LC2 + 1.2*LC3 +1.3*LC4 + 1.3*LC5

The program will then generate (explode) the following linear combinations:

LC1

LC1 + 1.2*LC2

LC1 + 1.2*LC3

LC1 + 1.3*LC4

LC1 + 1.3*LC5

LC1 + 1.2*LC2 + 1.2*LC3

LC1 + 1.2*LC2 + 1.3*LC4

LC1 + 1.2*LC2 + 1.3*LC5

LC1 + 1.2*LC3 + 1.3*LC4

LC1 + 1.2*LC3 + 1.3*LC5

LC1 + 1.2*LC2 + 1.2*LC3 + 1.3*LC4

LC1 + 1.2*LC2 + 1.2*LC3 + 1.3*LC5

Example for Code-related combination

Let’s assume a continuous beam subject to several loads.

LC1	self weight
V1
V2
V3
V4
S1
S2

Let’s define a code-related combination to Eurocode. The combination definition contains all the defined load cases.

Name	Type	Load cases	Coefficiens
UEC	EC – ultimate	LC1 V1 V2 V3 V4 S2 S2	1.00 1.00 1.00 1.00 1.00 1.00 1.00

SCIA Engineer creates a set of "dangerous" combinations for the given definition:

UEC.1	User – ultimate	LC1	1,35
UEC.2	User – ultimate	LC1 V1 V2 V3 V4	1,35 1,50 1,50 1,50 1,50
UEC.3	User – ultimate	LC1 V1 V2 V3 V4	1,00 1,50 1,50 1,50 1,50
UEC.4	User – ultimate	LC1 S1 S2	1,35 1,50 1,50
UEC.5	User – ultimate	LC1 S1 S2	1,00 1,50 1,50
UEC.6	User – ultimate	LC1 V1 V2 V3 V4 S2 S2	1.35 1.35 1.35 1.35 1.35 1.35 1.35
UEC.7	User – ultimate	LC1 V1 V2 V3 V4 S2 S2	1.00 1.35 1.35 1.35 1.35 1.35 1.35

When displayed in the Document, the Combinations table looks like: