Benefits of Ribbed or Waffle Slab System
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Ribbed and waffle slabs stand for a lighter and harder slab with regard to an identical flat slab which minimize the span of foundations. They create a very good form of construction where problem may occur due to slab vibration, as for instance laboratories and hospitals.
Ribbed slabs are formed with wide band beams running among columns having thin ribs stretching the orthogonal direction. Generally, the ribs and the beams contain the equivalent depth. The system is finished with a thin topping slab.
Waffle slabs are deeper as compared to the similar types of ribbed slab. Waffle slabs contain a thin topping slab and narrow ribs stretching in both directions among column heads or band beams. The column heads or band beams contain the equivalent depth as the ribs.
This type of construction is not frequently used due to the high formwork costs and poor fire rating. A 120-mm-thick slab containing a minimum rib thickness of 125 mm for continuous ribs is needed to obtain a 2-hour fire rating.
A rib thickness in excess of 125 mm is normally needed to adjust tensile and shear reinforcement. Ribbed slabs are ideal for medium to heavy loads and extent reasonable distances. They are very hard and specifically are very stiff and particularly appropriate where the soffit is uncovered.
Slab depths generally differ from 75 to 125 mm and rib widths from 125 to 200 mm. Rib spacing of 600 to 1500 mm should be utilized. The overall depth of the floor generally differs from 300 to 600 mm with overall spans of up to 15 m if reinforced, higher if post-tensioned.
Also Read: Ribbed and Waffle Slabs Construction
As the ribs are provided to the soffit of the slab, it minimizes the quantity of concrete and reinforcement as well as the weight of the floor. The saving of materials will be offset with the complication in formwork and arrangement of reinforcement.
The complexity in formwork is reduced with the utilization of standard, modular, reusable formwork, generally build with polypropylene or fibre glass and with tapered sides to facilitate stripping.
For ribs at 1200-mm centres (to adapt standard forms) the inexpensive reinforced concrete floor span ‘L’ is approximately D x 15 for a single span and D x 22 for a multi-span, where D stands for the overall floor depth. The one-way ribs are generally designed as T-beams, often stretching in the long direction. A solid drop panel is necessary at the columns and load bearing walls for shear and moment resistance.
• Savings on weight and materials
• Considerably light and cost-effective due to foundation costs and longer spans.
• Attractive soffit appearance when uncovered
• Inexpensive when reusable formwork pans are applied
• Vertical penetrations among ribs are simple.
• Less construction time.
• Fairly slim floor depths
• Greater vibration control
• Long lasting finishes
• Suitable for services integration
• Strong fire resistance capacity
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