Here are the 10 Incredible Benefits of Composite Construction in Steel Intensive Multistorey Buildings as below. The following images would give you some idea about composite design of multistorey buildings.
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Composite Construction Long Span Structure |
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Girder Slab Composite Construction |
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Composite Multistorey Building |
Composite construction has contributed significantly to the steel intensive construction in the commercial and industrial building sector in India. The main benefits of composite construction are:
1. Speed of construction
Bundles of decking can be positioned on the structure by crane and the individual sheets then installed by hand. Using this process, crane time is minimal, and in excess of 400 m2 of decking can be installed by one team in a day, depending on the shape and size of the building footprint. The use of the decking as a working platform speeds up the construction process for trades and services to follow next. Minimal mesh reinforcement is required (often eliminated with indented deck profile to behave compositely with concrete), and large areas of floor can be poured quickly. Floors can be concreted in rapid succession. Another option is to used precast hollow core slabs between steel beams. Further option being the use of fibre reinforced concrete which can further reduce the time programme, as the reinforcement installation period is significantly reduced. It is fast track construction mode.
2. Safe method of construction
The decking can provide a safe working platform and act as a safety ‘sheild’ to protect workers below from falling objects. Of course, the construction load should not exceed 1.5kN/m^2 for services.
3. Saving in weight
Composite construction is considerably stiffer and stronger than many other floor systems, so the concrete dead weight and size of the primary structure can be reduced considerably. Consequently, reduced seismic load in high seismic areas and foundation sizes can also be reduced. This ia a major advantage over conventional stand alone steel or concrete design for the building.
4. Saving in transport
Decking is light and is delivered in pre-cut lengths that are tightly packed into bundles. Typically, one lorry can transport in excess of 1000 m2 of decking. Therefore, a smaller number of deliveries are required when compared to other forms of construction. Besides, member sizes being small, a low capacity crane may be used for erection and lifting purpose with just few workmen at site.
5. Structural stability
The decking can act as an effective lateral restraint for the beams, provided that the decking fixings have been designed to carry the necessary loads and specified accordingly. The decking may also be designed to act as a large floor diaphragm to redistribute wind loads in the construction stage, and the
composite slab can act as a diaphragm in the completed structure. The floor construction is robust due to the continuity achieved between the decking, reinforcement, concrete and primary steel structure. Propping of primary beams are suggested for composite action be effective for DL+LL condition.
6. Shallower construction
The stiffness and bending resistance of composite beams means that shallower floors can be achieved than in non-composite construction. This may lead to smaller storey heights, more room to ccommodate services in a limited ceiling to floor zone, or more storeys for the same overall height. This is especially
true for Slim Floor and Girder-Slab construction, whereby the beam depth is contained within the slab depth. To avoid site nuisence, precast hollow core slab may repalce metal deck and in-situ concrete pour. So minimum westage of water and materials, less lobour management, early handover is possible.
7. Sustainability
Steel has the ability to be recycled repeatedly without reducing its inherent properties. This makes steel framed composite construction a sustainable solution. ‘Sustainability’ is a key factor for clients, and at least 95% of all steelconstruction products can be either re-used or recycled upon demolition of a building. Composite construction augments green building concept to receive IGBS/LEEDS approval.
8. Use Of Higher Grades of Materials in Steel and Concrete
High Tensile Steel Grade and High Strength Concrete Grade may be used in combination to achive optimum column and beam sizes. Concrete filled steel tubes are great option for columns.
9. Easy installation of services
Cable trays and pipes can be hung from hangers that are attached using special ‘dovetail’ recesses rolled into the decking profile, thereby facilitating the installation of services such as electricity, telephone and information technology network cabling. These hangers also allow for convenient installation of false ceilings and ventilation equipment. Attachments are detailed to support masonry too.
10. More sellable area
Increased sellable plan footprint because of reduced size of members (columns, floor beams)
Type of Industrilised Floor System
- Steel Beam - Precast Hollow Core slab System or Girder-Slab system
- Slim Deck System using deep metal decks
- Few others as propreitory systems
Applications
Composite slabs have traditionally found their greatest application in steelframed office buildings, but they are also appropriate for the following types ofbuilding:
- Other commercial buildings
- Industrial buildings and warehouses
- Leisure buildings, Hotels
- Multilevel off street car park
- Store houses for grains, vegitables
- Megaplexes
- Stadia
- Hospitals
- Schools
- Cinemas
- Housing; both individual houses and residential buildings
- Refurbishment projects.
- Highway Bridges
Recommendation
The above advantages often lead to a saving in cost over other systems. Studies found that the cost of modern commercial buildings shows solutions involving composite construction to be more economical than traditional steel or concrete alternatives for both a conventional four storey office block and an eight storey prestigious office block with an atrium.
Disclaimer
The contents of this article is for informational purpose only and proper professional guidence would be required before implementation of design and construction of composite buildings.
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