Structural Design Calculations. a. Temporary shoring is defined by AREMA, Vol. 2, Ch. 8, Article 28.1.1, and is anticipated to be in service for not more than an 18-month period. Earth retention structures that are anticipated to be in service for more than 18 months shall be designed per AREMA as permanent structures. b. Calculations shall be performed for each stage of construction, when one or more rows of braces/tiebacks are being implemented. The calculations shall be performed for each stage of excavation before the braces/tiebacks are installed for that stage. c. Calculations shall be performed by one of two methods:
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Sources: Guidelines for Temporary Shoring, Guidelines for Temporary Shoring, Guidelines for Temporary Shoring