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165 lines
9.6 KiB
Text
165 lines
9.6 KiB
Text
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"# Composite floors"
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]
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},
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"Corrugated sheet metal sheets are very suitable to act as formwork for cast in situ concrete floors. The sheets are light, are easily applied and can\n",
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"immediatly act as a working floor. The trapezoidal shape causes weight saving in comparison with a massive concrete floor.\n",
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"Strengths of composite floors are the flexibility, construction speed, low mass, adaptability and high amoun of thermal mass with respect to the\n",
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"actual mass. The low self weight of the composite floor construction, $210 - 340 kg/m^2$, causes the air and sound insulation to be lower than with prefab\n",
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"concrete elements. This problem can be solved with a suspended ceiling and/or a double floor. With these solutions the same\n",
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"results can be achieved as with a massive floor of 800 kg/m2. The composite floors do not have a flat surface, but this does not have to be\n",
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"a problem if the correct connections are used. Floors with voids or curved façades can easily be built. The construction speed does not depend\n",
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"on the formwork system or hardening time. The laid out sheets act as working floor, formwork and a roof for the crews installing the building\n",
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"finishes.\n",
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"\n",
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"```{note}\n",
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"www.dutchengineering.nl\n",
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"The information on composite floors was written in cooperation with Hody B.V.\n",
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"```\n",
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"\n",
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"```{figure} Images/CompositeFloors1.jpg``` \n",
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"\n",
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"```{figure} Images/CompositeFloors2.jpg``` \n",
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"\n",
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"## Applications\n",
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"\n",
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"```{figure} Images/CompositeApplication1.jpg``` \n",
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"```{figure} Images/CompositeApplication2.jpg``` \n",
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"```{figure} Images/CompositeApplication3.jpg``` \n",
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"```{figure} Images/CompositeApplication4.jpg``` \n",
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"```{figure} Images/CompositeApplication5.jpg``` \n",
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"\n",
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"## Execution aspects\n",
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"\n",
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"Corrugated, galvanized steel sheets with a thickness of 0,7 to 1,2 mm act as lost formwork and reinforcement for the composite floor. In principle the steel plates act as\n",
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"the main reinforcement. The extra reinforcement shown in the pictures prevents excessive cracking and has a beneficial effect of the behaviour of the flour under fire conditions. As\n",
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"a rule of thumb the thickness of the floor can be estimated as 1/30 of the span. Depending on the thickness of the floor, free spans up to 3,25 m are\n",
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"possible. If temporary supports are used the spans can increase up to 9,60 m. Whether the concrete floor is connected with shear connectors\n",
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"(studs) to the steel support beams or not determines the force distribution. If the shear studs are applied, the steel beam acts as tensile chord\n",
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"and the concrete will take up all the compression. A composite beam is formed. If no shear studs are applied, the beam and floor act separately. If\n",
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"the shear studs are highly loaded it is recommended to weld them directly to the beam, instead of welding them to the beam through the steel plates.\n",
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"Composite floors can also be applied in combination with integrated beams, where the corrugated sheet is placed on the widened bottom flange of a\n",
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"profile. Voids in the floor are provided with formwork to contain the wet concrete.\n",
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"\n",
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"## Product specifications HODY SB60 floor\n",
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"\n",
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"```{figure} Images/CompositeFloors1.jpg``` \n",
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"\n",
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"```{figure} Images/CompositeFloors2.jpg``` \n",
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"\n",
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"| Plate Reinforcement | |\n",
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"|---------------------------|---------------------------------------------------------------|\n",
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"| Plate thickness (including zinc) | 0.75 mm / 0.88 mm / 1.00 mm |\n",
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"| Nets | FeB 500 HKN |\n",
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"| Additional bars | FeB 500 HKN / HWL |\n",
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"| Profile height | 60 mm |\n",
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"| Concrete Total width | 1086 mm |\n",
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"| Effective width | 1010 mm |\n",
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"| Length | Any length possible |\n",
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"\n",
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"| Material properties | |\n",
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"|---------------------------|---------------------------------------------------------------|\n",
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"| Characteristic yield stress | Minimal 320 N/mm² |\n",
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"| Ultimate strain | Minimal 17% |\n",
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"\n",
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"Based on: C28/35. Other strength classes can be applied except for lightweight concrete.\n",
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"\n",
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"## Spans\n",
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"\n",
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"### Offices and lodging\n",
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"\n",
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"| Span (mm) | Number of Props | Thickness (mm) | Type of Top Reinforcement (for Continuous Floors) |\n",
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"|-----------|------------------|----------------|-----------------------------------------------------------|\n",
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"| 1.500 | 0 | 110 | Reinforcement Net: 7-150 |\n",
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"| 2.000 | 0 | 110 | Reinforcement Net: 7-150 |\n",
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"| 2.500 | 1 | 110 | Reinforcement Net: 7-150 |\n",
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"| 3.000 | 1 | 130 | Reinforcement Net: 7-150 |\n",
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"| 3.500 | 2 | 150 | Reinforcement Net: 7-150 |\n",
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"| 4.000 | 2 | 170 | Reinforcement Net: 7-150 |\n",
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"| 4.500 | 2 | 200 | Reinforcement Net: 8-150 |\n",
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"| 5.000 | 3 | 210 | Reinforcement Net: 8-150 + 8 - 300 |\n",
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"| 5.500 | 3 | 220 | Reinforcement Net: 8-150 + 8 - 300 |\n",
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"| 6.000 | 4 | 230 | Reinforcement Net: 8-150 + 8 - 300 |\n",
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"| 6.500 | 5 | 290 | Reinforcement Net: 8-150 + 8 - 150 |\n",
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"\n",
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"```{note}\n",
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"Span table HODY SB60 floor OFFICES and LODGING\n",
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"SHEET THICKNESS 0,75 mm\n",
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"- strength class C20/25\n",
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"- topping max. 50 mm\n",
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"- no voids / ducts through the floor.\n",
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"- variable load 2,5 kN/m2\n",
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"- light walls 0,5 kN/m2\n",
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"- fire resistance: 30 minutes\n",
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"- minimal bearing length of steel plate: 50 mm on steel or concrete and 75 mm on other materials\n",
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"- minimal bearing length for casting is an extra 25 mm.\n",
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"```\n",
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"\n",
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"### Residential\n",
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"\n",
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"| Span [mm] | Number of Props | Thickness [mm] | Type of Top Reinforcement (for Continuous Floors) |\n",
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"|-----------|------------------|----------------|----------------------------------------------------|\n",
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"| 1.500 | 0 | 110 | Reinforcement Net: 7-150 |\n",
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"| 2.000 | 0 | 110 | Reinforcement Net: 7-150 |\n",
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"| 2.500 | 1 | 110 | Reinforcement Net: 7-150 |\n",
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"| 3.000 | 1 | 130 | Reinforcement Net: 7-150 |\n",
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"| 3.500 | 2 | 150 | Reinforcement Net: 7-150 |\n",
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"| 4.000 | 2 | 170 | Reinforcement Net: 7-150 |\n",
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"| 4.500 | 2 | 200 | Reinforcement Net: 8-150 |\n",
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"| 5.000 | 3 | 210 | Reinforcement Net: 8-150 + 8 - 300 |\n",
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"| 5.500 | 3 | 220 | Reinforcement Net: 8-150 + 8 - 300 |\n",
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"| 6.000 | 4 | 230 | Reinforcement Net: 8-150 + 8 - 300 |\n",
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"| 6.500 | 5 | 290 | Reinforcement Net: 8-150 + 8 - 150 |\n",
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"\n",
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"```{note}\n",
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"Span table HODY SB60 floor RESIDENTIAL BUILDINGS\n",
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"SHEET THICKNESS 0,75 mm\n",
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"- strength class C20/25\n",
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"- topping max. 50 mm\n",
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"- no voids / ducts through the floor\n",
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"- variable load 1,8 kN/m2\n",
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"- fire resistance 30 minutes\n",
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"- minimal bearing length of steel plate: 50 mm on steel or concrete and 75 mm on other materials\n",
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"- minimal bearing length for casting is an extra 25 mm.\n",
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"```\n"
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