REINFORCED CONCRETE
REINFORCED CONCRETE
FLOOR STRUCTURES
FLOOR STRUCTURES
Floor structures Building constructure 2
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Structure of RC floors
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joist structures
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Classification of RC floor structures
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monolithic RC floor structures
- flat slab construction
- joist construction
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precast RC floor structures
- prefab RC joist structure
- prefab RC panel floor structure
- prefab RC mushroom floor structure
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composite RC floor structure
- joist construction formed with hollow brick or concrete units
- composite RC slabs
Floor structures Building constructure 2
MONOLITHIC RC FLOOR STRUCTURES
MONOLITHIC RC FLOOR STRUCTURES
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Formwork
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Permanent formwork
(„lost formwork“)
Floor structures Building constructure 2
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Monolithic RC flat slab floor structures
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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:
Floor structures Building constructure 2
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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
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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
Floor structures Building constructure 2
JOIST AND RIB MONOLITHIC RC FLOORS
Self-acting (lost) formwork
Floor structures Building constructure 2
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two way joist and rib floor structures (waffle and grid structures)
- waffle and grid floor structures with visible joists
Floor structures Building constructure 2
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Glass-concrete floor structure
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glass concrete floor structure
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glass concrete vault and
cupola structure
l = max 1,5 m
150 x 150mm - 250 x 250mm
Floor structures Building constructure 2
PRECAST RC FLOOR STRUCTURES
PRECAST RC FLOOR STRUCTURES
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Precast RC beam floors
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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
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interaction
of floor panels
Floor structures Building constructure 2
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solid panels
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precast ceramic-concrete
floor panels
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precast ceramic-concrete
„planks“
Floor structures Building constructure 2
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prestressed hollow panels
Floor structures Building constructure 2
Floor structures Building constructure 2
COMPOSITE
COMPOSITE
RC FLOOR
RC FLOOR
STRUCTURES
STRUCTURES
COMPOSITE RC FLOOR STRUCTURES
COMPOSITE RC FLOOR STRUCTURES
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Composite RC floors from ribs and fillers
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interconnection
– interaction of precast and monolithic parts
Floor structures Building constructure 2
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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
Floor structures Building constructure 2
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Composite RC floors with ceramic fillers
t
h
Floor structures Building constructure 2
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Structural modifications for heavier loading
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Composite RC floors from prestressed RC ribs type HATTRICK and
HURDIS fillers
Floor structures Building constructure 2
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Composite RC slabs
Floor structures Building constructure 2
l =7,2 – 8,4 m
t = 150 – 250 mm
u = min 75 mm
Floor structures Building constructure 2 500 výztužné žebro instalační komínek polodrážka zeslabená stěna instalační komínek