1- Introduction
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Hollow Blocks Slabs
Photos Hollow Blocks Slabs
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Hollow Blocks Concept
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Types of Hollow Slabs
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2- Code Requirements for H.B. Slabs
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ECP 203/2017 P6-16 - p 6-17 Sectors are commonly used
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Types of Hollow Blocks Slabs
One Way Hollow Blocks Slabs Two way Hollow Blocks Slabs
𝐿𝑠 ≤ 5
𝐿𝑠 > 5
𝐿𝑠 ∶ Short DirectionEffective Length
𝐿 ∶ Long Direction
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Calculation of Loads
D.L=
One Way Hollow Blocks Slabs
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Load / Rib. Design of Strip
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Two way Hollow Blocks Slabs
Use Table (6-3) , Page (6-17)Use Table (6-2) , Page (6-10)
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Simple Span
Two Span
Continues Span
Difference of spans & Loads ≤ 20 %
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Difference of spans & Loads > 20 %
Uniform Load Concentrated Load
𝑀−𝑣𝑒 =𝑊𝐿 ∗ 𝐿𝐿
′ 3 +𝑊𝑅 ∗ 𝐿𝑅′ 3
8.5 𝐿𝐿′ + 𝐿𝑅
′
𝐿′ = 𝐿
𝐿′ = 0.8𝐿
𝑀−𝑣𝑒 =𝑘𝐿 ∗ 𝑃𝐿 ∗ 𝐿𝐿
′ 2 + 𝑘𝑅 ∗ 𝑃𝑅 ∗ 𝐿𝑅′ 2
𝐿𝐿′ + 𝐿𝑅
′
0.700.600.500.400.30a1/𝐿𝐿&a1/𝐿𝑅0.1280.1580.1760.1820.168𝑘𝐿&𝑘𝐿
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Design of Sections
+ ve Section + ve Section
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Details of R.F.T
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Details of R.F.T
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Notes:
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Example : 1
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Example : 2
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Arrangement
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Example : 3
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Inclined Hollow Block Slab
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Example : 4
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Design of beams
1-Projected beams
a-For one way H.B. Slabs
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a-For two way H.B. Slabs
i- Load for Moment
ii- Load for Shear
Beam 1
Beam 2
i- Load for Moment
ii- Load for Shear
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2-Embedded (hidden) beams
Method 1
Method 2
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Check shear on hidden beam
4-2-2-1-2 p 4-16
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4-2-2-1-3 p 4-18
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4-2-2-1-3 p 4-19
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4-2-2-1-2 p 4-17
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p 4-20
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p 4-21
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