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Clause 2.1 HS or NS Form Clause 2.2 Size of HS Clause 2.3 Wall and Slab Thickness of HS and NS Clause 2.4 Location of HS Clause 2.5 HS Door Clause 2.6 Precast Hollow Core Household Shelters (Precast HS) Clause 2.7 Fixtures in HS Clause 2.8 NS in HS Tower Clause 2.9 Transfer Structure Supporting HS Tower Clause 2.10 HS Beneath An Internal Staircase Clause 2.11 Finishes in HS Clause 2.12 Exit Staircase Clause 2.13 Door Recess on HS Wall

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Clause 2.9 Transfer Structure Supporting HS Tower

TRHS 2023

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2.9.1 General

If the loads from walls of HS towers cannot be carried directly to the foundation, transfer structure can be used to carry the loads indirectly to the foundation. The transfer structure could take the form of slab, beams, or combination of both. When transfer structure is provided to carry HS tower, additional technical requirements described herein shall be complied with. Please note the following conditions in the HS tower design supported by transfer structure:

a. RC slab shall be used as the shielding element of the transfer structure and its supporting columns and walls. See FIGURE 2.9.1(a) and (b).

b. The use of trellis or/and the adjacent building structure as shielding element of the transfer structure and its supporting columns and walls of HS is not allowed.

c. Only one transfer of HS loads in each tower by the transfer structure to its supporting columns and/ or walls is allowed. Multiple transfers of HS loads from the same HS tower are not allowed.

d. For unshielded exterior columns, the minimum size (either its diameter or the shorter dimension) shall be 500mm.

e. The use of pre-stressed concrete for the transfer structure and its supporting columns and walls is not permitted.

2.9.2 Transfer Structure

Additional design checks on transfer structure supporting HS tower is required. See Clause 3.3.