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composite roof is a kind of structural ceiling that is combined with concrete and concrete . In this type of roof, bending and shear anchors are supported by metal beams in combination with concrete. The pressure with the upper wing of the beams is sustained by the concrete , bearing the tensile strength to the lower wing of the beam . In this way, a cross section of concrete and steel is created to withstand tensile and compressive anchors. To engage concrete and steel in the beams, metal parts are welded on the tops of the beams as cutters. The rebars on the composite roof are thermal rebars. In the opposite direction to the side beams, they cause the concrete to integrate and collide with the composite roof, and by welding the side beams, they prevent the concrete from cracking.
in the format of the conventional type of roofs ( not a steel deck ) commonly used . In some cases ionolite is used Because they are not strong, they have to pile piles, which has more execution problems. another reason why lies under the roof and from the area under the roof of the composite , whose tributaries are usually bees . The facility could not be used to pass the facility . also , it is not a good insulation for high heat .
These roofs are more resistant than block joists And when the earthquake is over , they work better because of greater integration .choosing a suitable roof type for the structure can reduce many costs and increase the quality of the structure .
1.High Speed in execution
2.low weight with structure
3.Having an economic justification
In general, various roofing methods can be divided into 3 groups: beamed roofs, composite roofs, and concrete slabs. The group of the composite roofs consists of four types of roof .
1.Metallic composite
2.Kermit composite
3.Steel deck
4.Roofix
1.composite roof transfer itself unilaterally. This roof is a combination of steel beams and concrete slabs.
2.In the composite roof, neutral concrete under the wire, which is tensile concrete, is abandoned and steel is used instead. that steel has good performance both in tension and pressure .
3.in the composite roof , due to the lack of a clay block , there is an appropriate hollow spaces between the plates . This hollow space can be used for electrical and water piping and building installations. There is also an air cushion between the slab and the false ceiling below it, which is a good sound insulation.
4.When installing a composite roof, care must be taken to use appendages called studs or cut studs to engage the steel and concrete slab.
5.under the composite roof is used to cover the walls of a false ceiling that is applicable to architectural designs .
Composite roofing has a higher cost than common beams, blocks and chromite roofs due to the high cost of false workmanship. however , the administrative speed of the composite roofs is greater than the tiles , blocks and chromite .But due to the heavy fabrication and the need for angling, the project will take longer to complete. composite roofs are not an appropriate option for the ceiling of residential projects because of vibration . Unless all the secondary and main beams are piled during concreting, in which case the simultaneous implementation of several roofs is eliminated or will be associated with many problems.
Conventional composite systems are made with open beams and usually put together with a sheet of steel sheathing on the concrete . In this system , the mold is permanent And the pieces of life are not surrounded by concrete . Common composite systems in Iran that are used with simple beams or honeycombs with sheet beams are not open-ended. In Kermit composite roof, due to the light weight of the roof and the reduction of the load on the joists, the execution of long openings has been done with more confidence.And the concrete stress will remain very low like all kermit roof systems and the resistance coefficient of the ceiling is high .
1.Kermit metal beams
2.Thermal rebars
3.metal format
4.Transverse coil
5.Concrete surface
In this roof, empty spaces between the beams are molded using metal molds finally , by removing them , the ceiling is light . In this system, due to the complete sinking of the joists in concrete, less vibration is observed compared to similar systems of conventional composite.
Speed and ease of execution : In this system , it is easier to implement the roof than similar systems And it 's doing more quickly. 48 hours after concreting, walkable on the roof and it 's lightweight and can continue building operations this advantage accelerates the process of construction .
Ability to run multiple ceilings simultaneously : Due to the fact that there is no piling in the Kermit roof system . practically , a few roofs can be prepared for concrete At the same time, he carried out concreting operations on the roofs. This is very cost effective and suitable for buildings with high floors or low infrastructure.
integrity of the roof and the skeleton : Due to the welding of the beams to the skeleton, after taking the concrete, the roof and the skeleton are integrated and can act like a rigid diaphragm. In concrete structures, by considering special hooks, more integration is possible.
Ability to delete caches : according to the integrity of the roof and the skeleton , the caches can be removed . Eliminating scratches, in addition to saving steel consumption, makes the roof more uniform And minimizes joinery operations.
Low stress in concrete : Due to the static nature of the beams the tension in the concrete is very low. Loading tests on kermit roofs whose final strength of concrete was less than the desired value, showed that low-strength concrete does not damage the load-bearing capacity of the roof.
Possible to design and implement the roof with specific openings and openings : In Kermit roof system, it is possible to design and execute a roof with long openings and heavy loads So far, a roof with an opening of 12.5 meters and also a roof with a load intensity of 7 tons per square meter has been implemented In each case , the loading tests confirmed the safety of the ceiling .
Ahan Pouya with more than a decade of best-selling experience, adheres to professional and ethical principles in the field of selling and buying at inside and outside the borders of Iran, helping you in the steel industry.
