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Class 1 buildings – robustness measures
3.4NI-wide·Technical Booklet D Structure
For a Class 1 building, provided the building has been designed and constructed in accordance with the publications specified in Section 2 or, in the case of a single family house of not more than 3 s
dwellingstructuralhrbClass 2A buildings – horizontal ties and floor anchorage
3.5NI-wide·Technical Booklet D Structure
For a Class 2A building, effective horizontal ties should be provided, or effective anchorage of suspended floors to walls, as described in the codes and standards listed under paragraph 3.8 for frame
structuralhrbClass 2B buildings – ties or notional removal checks
3.6NI-wide·Technical Booklet D Structure
For a Class 2B building either (a) or (b) should be followed – (a) provide effective – (i) horizontal ties, as described in the codes and standards listed under paragraph 3.8 for framed and load-beari
structuralhrbClass 3 buildings – systematic risk assessment and design
3.7NI-wide·Technical Booklet D Structure
For Class 3 buildings, a systematic risk assessment of the building should be undertaken taking into account all the normal hazards that may reasonably be foreseen, together with any abnormal hazards.
structuralhrbhigh-riseEffective horizontal and vertical ties and key element design
3.8NI-wide·Technical Booklet D Structure
Details of the effective horizontal and vertical ties, together with the design approaches for checking the integrity of the building following the notional removal of vertical members and the design
structuralhrbArea at risk of collapse limitation
3.6NI-wide·Technical Booklet D Structure
area at risk of collapse limited to 15% of the floor area of that storey or 100 m2, whichever is less, and does not extend further than the immediate adjacent storeys
structuralhrbKey elements
3.10NI-wide·Technical Booklet D Structure
A "key element", as referred to in paragraph 3.6, should be capable of sustaining an accidental design loading of 34 kN/m2 applied in the horizontal and vertical directions (in one direction at a time
structuralhrbCavity wall ties - material and compliance
4C.11NI-wide·Technical Booklet D Structure
The cavity wall ties should comply with BS EN 845 -1 and DD 140 2 and should be material references 1 or 3 in BS EN 845 -1: Table A.1, austenitic stainless steel. Wall ties should be selected in accor
structuralhrbCavity wall tie spacing requirements
4C.12NI-wide·Technical Booklet D Structure
The cavity wall ties should have a horizontal spacing of 900 mm and a vertical spacing of 450 mm, which is equivalent to 2.5 ties per square metre. Wall ties should also be spaced not greater than 300
structuralhrbCavity wall ties selection table
Table 4C.5NI-wide·Technical Booklet D Structure
Table 4C.5 Cavity wall ties | Normal cavity width(1) (mm) | Permissable types of tie | Tile length(2) (mm) | Tie shapes in accordance with BS EN 845-1 | Tie number in accordance with DD140-2 | 50 to 7
structuralhrb