NOTE When blocks with horizontal cores are used see Figure 7 4 services can be

Note when blocks with horizontal cores are used see

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NOTE When blocks with horizontal cores are used (see Figure 7-4), services can be accommodated inside the block; in such cases the extra slab thickness is not required. 7.1.3.2.5 Reinforcement 7.1.3.2.5.1 The main reinforcement will be included in the fabricated joist supplied by the manufacturer; this will be based on the slab drawings and live load required to be supported. 7.1.3.2.5.2 Additional joist reinforcement is required as follows: (a) joist on edge - must be able to absorb a negative moment of 20% of the free span moment: a min of 10 mm HT bar x 1.2 m is required; and (b) joist in continuity over internal wall (to prevent cracks on top of the slab) - must be able to absorb a negative moment of 60% of the free span moment: a min of 12 mm HT bar x 2.0 m is required. 7.1.3.2.5.3 The topping shall receive the fabric reinforcement installed across the joist. 7.1.3.2.5.4 When the slab span is more than 3.6 m, a central stiffener made of solid concrete or of 80 mm blocks topped with concrete is required. The reinforcement is done with two 10 mm bars in continuity. 7.1.3.2.5.5 The perimeter beam shall be reinforced with four 12 mm diameter bars. 7.1.3.2.6 Slab openings (a) small openings (less than 1.1 m across the joist) - this type of opening is contained inside two joists and a small integrated beam shall be made and connected at each end to a minimum of two joists; only one joist is cut. See Figure 7 -5 ; and (b) large openings (more than 1.1 m wide) - in this case several joists are cut and a complete reinforced concrete solution must be adopted; see Figure 7-6 .
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PCTTS 599: 20XX 126 Figure 7-5 Joist and block slab with small opening Figure 7-6 Joist and block slab with large opening
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PCTTS 599: 20XX 127 7.1.3.2.7 Balconies 7.1.3.2.7.1 Where a balcony is a cantilevered slab, the top reinforcement must be anchored in the main floor slab for a minimum distance of 0.8 times the balcony span. In this area, at least 50 % of the slab thickness must be of solid concrete. This additional concrete will allow for the anchorage of the top reinforcement of the balcony slab whether the balcony span is in the same direction of the joists or perpendicular to the joists. Figure 7-7 shows section details of a balcony. 7.1.3.2.7.2 The minimum thickness of the balcony slab shall be as follows: The total thickness = utile thickness + reinforcement coverage (see Table 4 -7) Where the utile thickness = 1/10 of span (minimum). 7.1.3.2.7.3 The reinforcement for balconies shall be in accordance with Table 7-2 . Figure 7-7 Balcony section details
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PCTTS 599: 20XX 128 Table 7-2 - Balcony reinforcement using high tensile steel Max span m Top reinforcement Long. Reinforcement Min. total thickness mm Bar dia. mm Min. length m No of bars per metre Bar dia. mm No of bars per metre 1.00 125 10 2.00 7 10 6 1.20 145 10 2.50 9 10 6 1.50 175 12 3.00 9 10 6 NOTE When a heavy concrete staircase is connected and supported by the balcony, the above table does not apply. In such cases, the input of a design professional is required.
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