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

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