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Floor structures Building constructure 2 REINFORCED CONCRETE FLOOR STRUCTURES

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REINFORCED CONCRETE

REINFORCED CONCRETE

FLOOR STRUCTURES

FLOOR STRUCTURES

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Floor structures Building constructure 2

Structure of RC floors

joist structures

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Classification of RC floor structures

monolithic RC floor structures

- flat slab construction

- joist construction

precast RC floor structures

- prefab RC joist structure

- prefab RC panel floor structure

- prefab RC mushroom floor structure

composite RC floor structure

- joist construction formed with hollow brick or concrete units

- composite RC slabs

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Floor structures Building constructure 2

MONOLITHIC RC FLOOR STRUCTURES

MONOLITHIC RC FLOOR STRUCTURES

Formwork

Permanent formwork

(„lost formwork“)

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Floor structures Building constructure 2

Monolithic RC flat slab floor structures

one-way spanning slabs

- simply supported slab:

max. recommended span: 3 m

- slabs with fixed or continuous supports:

max. recommended span: 4,5 – 6 m

t = 1/25 .

L

(simple support)

t = 1/30.

L

(fixed support)

t

min

= 50 mm (l < 1 m)

t

min

= 60 mm (l < 1,5 m)

t

min

= 70 mm (l >1,5 m)

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two-way spanning slab

(ratio

l

1

/ l

2

= 1/1,5 )

- simply supported slabs:

max. recommended span: 4,5 x 4,5 up to 5,5 m

t = 1/75 . (l

x

+ l

y

)

t = 1/105 . (l

x

+ l

y

)

- slab with fixed supports:

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Floor structures Building constructure 2

locally supported slab floor structures – column and slab systems

- flat slabs with flat ceilings

- flat slabs with mushroom ceiling

t = min. 160 mm, l = max. 7 m q = max. 5 kN/m2

t > 1/35 l, t > 100 mm q > 10 kN/m2

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Monolithic RC joist and rib floor structures

one way joist and rib floor structures

(visible joists x flat soffit)

- monolithic RC joist floor structure

- monolithic RC rib floor structure

l

= 6 – 7 m a = 1,2 – 3,0 m

h = (1/17 – 1/10) l simply supported

h = (1/20 – 1/15) l fixt, contiuous

h = (1/12 – 1/10) l girders

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Floor structures Building constructure 2

JOIST AND RIB MONOLITHIC RC FLOORS

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Self-acting (lost) formwork

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Floor structures Building constructure 2

two way joist and rib floor structures (waffle and grid structures)

- waffle and grid floor structures with visible joists

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Floor structures Building constructure 2

Glass-concrete floor structure

glass concrete floor structure

glass concrete vault and

cupola structure

l = max 1,5 m

150 x 150mm - 250 x 250mm

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Floor structures Building constructure 2

PRECAST RC FLOOR STRUCTURES

PRECAST RC FLOOR STRUCTURES

Precast RC beam floors

precast RC beam floors

- the floor consists of a number

of beams placed side by side

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Precast RC floors from panels

interaction

of floor panels

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Floor structures Building constructure 2

solid panels

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precast ceramic-concrete

floor panels

precast ceramic-concrete

„planks“

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Floor structures Building constructure 2

prestressed hollow panels

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Floor structures Building constructure 2

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Floor structures Building constructure 2

COMPOSITE

COMPOSITE

RC FLOOR

RC FLOOR

STRUCTURES

STRUCTURES

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COMPOSITE RC FLOOR STRUCTURES

COMPOSITE RC FLOOR STRUCTURES

Composite RC floors from ribs and fillers

interconnection

– interaction of precast and monolithic parts

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Floor structures Building constructure 2

Composite RC floors from ribs and fillers

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Composite RC floors with interconnected ribs and fillers

(type „filigran“)

h = 190 – 300 mm t = 30 – 60 mm

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Floor structures Building constructure 2

Composite RC floors with ceramic fillers

t

h

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Floor structures Building constructure 2

Structural modifications for heavier loading

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Composite RC floors from prestressed RC ribs type HATTRICK and

HURDIS fillers

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Floor structures Building constructure 2

Composite RC slabs

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Floor structures Building constructure 2

l =7,2 – 8,4 m

t = 150 – 250 mm

u = min 75 mm

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Floor structures Building constructure 2 500 výztužné žebro instalační komínek polodrážka zeslabená stěna instalační komínek

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References

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