Singapore Fire Safety Engineering Guidelines 2015_1.pdf

Omission or reduction of fire rating of element of

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Omission or Reduction of Fire rating of element of structure (a) Root objectives The root objectives are : (i) R3.1 - Prevent the untimely collapse of buildings due to the effects of fire that would affect the safe egress of the building occupants. (ii) R3.3 - The building shall remain structurally stable to allow adequate time for fire-fighters to conduct their fire-fighting and rescue operations. (b) Sub objectives The sub objectives are : (i) S3.1 - Provision of elements of structure with appropriate fire resistance with respect to :- (1) the fire severity; and (2) fire fighting and rescue operations; and (3) the occupant evacuation time; and (4) enclosure characteristics and configurations; and (5) the height of building; and (6) occupancy characteristics; and (7) different fire risk levels. (ii) S3.2 - The construction and use of building materials should be of the type and method appropriate to the intended performance.
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65 (iii) S3.9 - Provisions for reasonable measures to prevent premature structural collapse of the building due to fire. Table 9.22 Design fires (sprinkler protected) Usage Location Size Remarks Area of concern Close to structural member in question Proposed by FSE Based on post flashover fires. Refer to Clause 3.2(b) on computation of post flashover fires. Table 9.23 Acceptance Criteria Scenario Base case (i) Load-Capacity ratio ≤ 1 . Structural engineer is to carry out structural analysis with thermal input from FSE. Annex I describes the steps to determine the load capacity ratio. (ii) Smoke temperature less than limiting steel temperature. Sensitivity Structure shall not fail due to failure of two or more key structural member(s) and increase fire size by 50% 9.1.6 Example 6 Ductless Jet Fans (Non-compliance(s) to FSR3:2008) Ductless Jet Fans (Non- compliance(s) to FSR3:2008). (a) Root objectives The root objectives are : (i) R7.2 - Provide smoke management in the building for firefighting operations. (b) Sub objectives N.A.
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66 Table 9.24 Design fires (sprinkler protected) Usage Location Size Remarks Vehicle/Car park Least favourable location i.e. longest smoke path that is away from openings. 10 MW truck fire (as prescribed by the fire code) or higher (if deemed necessary by FSE) Where trucks have access to the car park 4MW car fire/forklift fire (as prescribed by the fire code) or higher (if deemed necessary by FSE Table 9.25 Acceptance Criteria Scenario Base case Not more than 1,000 m 2 of the car park can be smoke-logged for 20 minutes Smoke temperature shall not exceed 250 o C at a height of 1.7m Visibility shall not be less than 5m at a height of 1.7m All other areas outside the smoke-logged area shall be kept substantially free from smoke i.e. smoke temperature not more than 60 0 C and visibility of at least 25m There shall be at least one viable approach route for fire fighters Sensitivity Analysis Failure of a group of jet fans nearest to the fire
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67 REFERENCES 1. Singapore Civil Defence Force, Code of Practice for Fire Precautions in Buildings 2013 2. Ministry of Business, Innovation & Employment New Zealand, C/VM2
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