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Combination setup

According to the codes EN 1990 Annex2 and EN 1991-2, it is not necessary to combine every variable load with the rest. Exact rules are given separately for all kinds of bridges and also for buildings. By default, all these rules are enabled, to follow standard EC-EN. However user will be able to use the rules in national annex setup by certain checkboxes. If the certain rule will be unchecked, than the combinations will ignore the recommendation from EC-EN and will not consider this rule.

Combination setup rules both for bridges and for buildings are listed here.

By setting focus on a certain rule, the description field will be displayed in the dialog to provide more detailed info on a selected value. In this field, three strings (Reference, Description and Application) are displayed.

Combination rules for Buildings:

The following rules for Combination setup for Buildings are given:

Category H loading not to be combined with snow or wind

• Reference: EN 1991-1-1: 3.3.2 (1)
• Description: On roofs, imposed loads, and snow loads or wind actions should not be applied together simultaneously.
• Application: Generation rule used in combinations for buildings.

Combination rules for Road bridges:

The following rules for Combination setup for Road bridges are given:

gr1b not to be combined with other non-traffic loads

• Reference: EN 1990: Annex A2 A2.2.2 (2)
• Description: Load Model 2 (or associated group of loads gr1b) and the concentrated load Q_fwk (see 5.3.2.2 in EN 1991-2) on footways need not be combined with any other variable non traffic action.
• Application: Generation rule used in combinations for road bridges.

Snow or wind load not to be combined with gr2

• Reference: EN 1990: Annex A2 A2.2.2 (3)
• Description: Neither snow loads nor wind actions need be combined with braking and acceleration forces or the centrifugal forces or the associated group of loads gr2.
• Application: Generation rule used in combinations for road bridges.

Snow or wind load not to be combined with gr3

• Reference: EN 1990: Annex A2 A2.2.2 (3)
• Description: Neither snow loads nor wind actions need be combined with loads on footways and cycle tracks or with the associated group of loads gr3
• Application: Generation rule used in combinations for road bridges.

Snow or wind load not to be combined with gr4

• Reference: EN 1990: Annex A2 A2.2.2 (3)
• Description: Neither snow loads nor wind actions need be combined with crowd loading (Load Model 4) or the associated group of loads gr4.
• Application: Generation rule used in combinations for road bridges.

Snow not to be combined with gr1a and gr1b

• Reference: EN 1990: Annex A2 A2.2.2 (4)
• Description: Snow loads need not be combined with Load Models 1 and 2 or with the associated groups of loads gr1a and gr1b unless otherwise specified for particular geographical areas.
• Application: Generation rule used in combinations for road bridges.

Wind loads not to be combined with Thermal loads

• Reference: EN 1990: Annex A2 A2.2.2 (6)
• Description: Wind actions and thermal actions need not be taken into account simultaneously unless otherwise specified for local climatic conditions.
• Application: Generation rule used in combinations for road bridges.

Snow loads and wind loads not to be combined with constr. activity

• Reference: EN 1990: Annex A2 A2.2.1 (10)
• Description: Snow loads and wind actions need not be considered simultaneously with loads arising from construction activity Qca (i.e. loads due to working personnel).
• Application: Generation rule used in combinations for road bridges.

Combination rules for Footbridges:

The following rules for Combination setup for Footbridges are given:

Q_fvk not to be combined with other non-traffic loads

• Reference: EN 1990: Annex A2 A2.2.3 (1)
• Description: The concentrated load Qfwk need not be combined with any other variable actions that are not due to traffic.
• Application: Generation rule used in combinations for footbridges.

Wind loads not to be combined with Thermal loads

• Reference: EN 1990: Annex A2 A2.2.3 (2)
• Description: Wind actions and thermal actions need not be taken into account simultaneously unless otherwise specified for local climatic conditions.
• Application: Generation rule used in combinations for footbridges.

Snow loads not to be combined with gr1 and gr2

• Reference: EN 1990: Annex A2 A2.2.3 (3)
• Description: Snow loads need not be combined with groups of loads gr1 and gr2 for footbridges unless otherwise specified for particular geographical areas and certain types of footbridges.
• Application: Generation rule used in combinations for footbridges.

Snow loads and wind loads not to be combined with constr. activity

• Reference: EN 1990: Annex A2 A2.2.1 (10
• Description: Snow loads and wind actions need not be considered simultaneously with loads arising from construction activity Qca (i.e. loads due to working personnel).
• Application: Generation rule used in combinations for footbridges.

Combination rules for Railway bridges:

The following rules for Combination setup for Railway bridges are given:

Snow loads not to be taken into account

• Reference: EN 1990: Annex A2 A2.2.4 (1)
• Description: Snow loads need not be taken into account in any combination for persistent design situations nor for any transient design situation after the completion of the bridge unless otherwise specified for particular geographical areas and certain types of railway bridges.
• Application: Generation rule used in combinations for railway bridges.

Wind action not to be combined with gr13 or gr23

• Reference: EN 1990: Annex A2 A2.2.4 (3)
• Description: Wind action need not be combined with groups of loads gr 13 or gr 23.
• Application: Generation rule used in combinations for railway bridges.

Wind action not to be combined with gr16, gr17, gr26, gr27

• Reference: EN 1990: Annex A2 A2.2.4 (3)
• Description: Wind action need not be combined with groups of loads gr 16, gr 17, gr 26, gr 27.
• Application: Generation rule used in combinations for railway bridges.

Snow loads and wind loads not to be combined with constr. activity

• Reference: EN 1990: Annex A2 A2.2.1 (10)
• Description: Snow loads and wind actions need not be considered simultaneously with loads arising from construction activity Qca (i.e. loads due to working personnel).
• Application: Generation rule used in combinations for railway bridges.

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