1810.2.5 More than one type, capacity or method of installation for deep foundations.
BC § 1810.2.5
In the conditions described below, the several parts of the building supported on the different types or different capacities of deep foundations shall be separated by suitable joints providing for differential movement, or analysis shall be prepared by the engineer, establishing to the satisfaction of the commissioner that the proposed construction is adequate and safe, and showing that the probable settlements and differential settlements to be expected will be tolerable to the structure and not result in instability of the building. The load test requirements of Section 1810.4 shall apply separately and distinctly to each deep foundation type, capacity, or method of installation, except where analysis of the probable, comparative behavior of the different type or capacity of the deep foundation or the method of installation indicates that data on one type or capacity of deep foundation permit a reliable extrapolation of the probable behavior of other types or capacities of deep foundations. The requirements of this section apply to the following proposed conditions: 1. Construction of a foundation for a building incorporating more than one type or capacity of deep foundations; 2. Modification of an existing foundation by the addition of deep foundations differing from the type or capacity used in the existing foundation; 3. Construction or modification of a foundation utilizing different methods or more than one method of installation, or using different types or capacities of equipment (such as different types of hammers having markedly different striking energies or speeds); or 4. Support of part of a building on deep foundations and part on shallow foundations.
