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04. joist (kuliah iv)
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04. joist (kuliah iv)

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  • 1. Joist Floor System Joist Floor Systems General framing layout of the pan joist system. 1
  • 2. One-Way Joist Construction Definition: Pan joist floor systems are series of closely spaced cast-in-place T-beams or joists used for long-span floors with relatively light loads. Typically removable metal forms (fillers or pans) are used to form joists. MacGregor, Fig. 10-28 One-Way Joist Construction Details of ribbed floor with removable steel pans. Ribbed-floor cross sections. 2
  • 3. One-Way Joist Construction The design of a ribbed floor with steel pan forms and average weight of the floor. One-Way Joist Construction The design of a ribbed floor with steel pan forms and average weight of the floor. 3
  • 4. One-Way Joist Construction Joist Details Joist Floor Systems • SNI Requirements for Joist Construction (Sec. 10.11, SNI 2847) – Slabs and ribs must be cast monolithically. – Ribs must be spaced consistently – Ribs may not be less than 100 mm in width 4
  • 5. Joist Floor Systems • SNI Requirements for Joist Construction (cont.) (Sec. 10.11, SNI 2847) – Depth of ribs may not be more than 3.5 times the minimum rib width – Clear spacing between ribs shall not exceed 750 mm. ** Ribbed slabs not meeting these requirements are designed as slabs and beams. ** Joist Floor Systems • Slab Thickness – (SNI Sec. 10.11.6.1) t ≥ 50 mm for joist formed with 500 mm wide pans t ≥ 62,5 mm for joist formed with 750 mm wide pans 5
  • 6. Joist Floor Systems • Slab Thickness (cont.) – Building codes give minimum fire resistance rating: 1-hour fire rating: 20 mm. cover, 75-90 mm slab thickness 2-hour fire rating: 25 mm. cover, 110 mm slab thickness Joist Floor Systems • Standard Removable Form Dimensions – Note the shapes 6
  • 7. Joist Floor Systems • Standard Removable Form Dimensions – Standard Widths: 500 mm. & 750 mm. (measured at bottom of ribs) – Standard Depths: 150, 200, 250, 300, 350, 400 or 500 mm. Joist Floor Systems • Standard Removable Form Dimensions (cont.) – End Forms: one end is closed (built-in) to form the supporting beam – Tapered End Forms: provide additional shear capacity at ends of joists by tapering ends to increase rib width. 7
  • 8. Joist Slabs Standard Pan Joist Form Dimensions Ref. CECO Concrete Construction Catalog Joist Slabs Standard Pan Joist Form Dimensions Ref. CECO Concrete Construction Catalog 8
  • 9. Joist Floor Systems • Laying Out Pan Joist Floors – Rib/slab thickness • Governed by strength, fire rating, available space – Overall depth and rib thickness • Governed by deflections and shear Joist Floor Systems • Laying Out Pan Joist Floors (cont.) – Typically no stirrups are used in joists – Reducing Forming Costs: • Use constant joist depth for entire floor • Use same depth for joists and beams (not always possible) 9
  • 10. Joist Floor Systems • Distribution Ribs –Placed perpendicular to joists* –Spans < 6m.: None –Spans 6-9 m.: Provided a midspan –Spans > 9 m.: Provided at third-points –At least one continuous 13mm bar is provided at top and bottom of distribution rib. *Note: not required by the Code, but typically used in construction 10