By:
Dr.Islam M. El-Habbal
2011
Photos of Hollow Blocks Slabs
Hollow Blocks Concept
Used Blocks
Dimensions of Hollow Blocks Slabs
Types of H.B. Slabs
Hollow Blocks Slabs
One way H.B. Slab
With Projected Beams
With Hidden Beams
Two Way H.B. Slabs
With Projected Beams
With Hidden Beams
Lc1= 200 x n1 + 100 x ncr
Lc2= 500 x n2 – 100Solid Part: 0.25m – 0.50m (Roofs
With Projected beams)0.80m – 2.0m (Roofs With Hidden beams)
Live Loads Span Condition
≤ 3.0 kN/m2 ≤ 5.0 m No Cross Ribs
≤ 3.0 kN/m2 > 5.0 m One Cross Rib
> 3.0 kN/m2 4.0 m to 7.0 m One Cross Rib
> 3.0 kN/m2 > 7.0 m Three Cross Ribs
Cross Rib Requirements
Design of One way slab
General Case
Blocks Available in Egyptian Markets
Common Case
Wu = [1.40 * (WH.B. + Wf.c.) + 1.60* (WL.L.)] * 0.50
From Hollow Blocks Table Area served by Ribs
Design of Two way slab
Design of Two way slab
General Case
Common Case
Wu = [1.40 * (WH.B. + Wf.c.) + 1.60* (WL.L.)] * 0.50
From Hollow Blocks Table Area served by Ribs
2-Hidden Beam
1. Reinforcement details of one way slabs.
2. Reinforcement details of two way slabs.
3. Reinforcement details of solid parts.
4. Reinforcement details of hidden beams.
5. Reinforcement details of cross ribs.
Special Case