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AS4678 Seismic Load

AS4678 Seismic Load

(OP)
Taking AS4678 I17 & I18 together(below)does this mean the external dynamic earth pressure loads and internal dynamic loads are only considered in separate load combinations? Can you give a reference?

I17 TOTAL LOAD UNDER EARTHQUAKE
The total load is calculated by adding the static loads and the external dynamic earth pressure loads, the dynamic water pressure loads, plus internal dynamic loads of the structure itself.
(paragraph omitted)

I18 INTERNAL DYNAMIC LOAD
(paragraph omitted)
For a reinforced soil structure, the internal dynamic load from the mobilized active zone is resisted by the reinforcement layers in proportion to their available frictional resistance.

The internal dynamic load is not considered to act concurrently with the external dynamic load.
 

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