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Light steel structure Building design application

Light steel structure Building design application

Structural concept: Multi-storey buildings in the light steel structural system most commonly used as a framework structure,according to the needs of the construction concept is sometimes also used suspension system. Column and Beam used Hot roller or welding shaped H section and sometimes it can be box-section column. Due to limited section of H beam , mainly use of welded Beam . Framework structure in flexible layLayout , every parts stiffness is relatively uniform , simple structure, easy construction.simple structure, easy construction. Its Its natural cycle is longer, lighter weight, for earthquake-insensitive.
But its small lateral stiffness, lateral displacement is difficult to control. There is a lift for some multi-storey
buildings, to enhance lateral rigidity, combined with its arrangement of the elevator shaft, you can also take
the frame – shear truss system or frame – wall (usually steel plate shear wall) architecture.

Multi-floor buildings steel floor system must have sufficient capacity, stiffness and integrity. Currently more commonly used is laying on the pressure plate in the beam, and then pouring concrete slab 100 ~ 150mm, that is between the pressure plate composite slabs, steel sheeting and steel beams connected with pegs. It may also be added with prestressed thin layer of concrete or cast reinforced concrete floor, this should ensure a reliable connection between the slab and the steel beam.
Consider the combined effect of such beams and slab design, can significantly increase the carrying capacity and the overall stability of the beam, and effectively reduce the high beams. When connected to the main beam and secondary beam simply supported generally high connections, sometimes made without high connections, such as the use of pressure-plate combination floor, in order to facilitate the laying of the pressure plate,
primary and secondary beam top surface of the plate thickness differential pressure type but also can increase the net storey building.

Envelope in order to reduce the weight of steel multi-housing, building envelope more use of lightweight materials.
Multi-wall facades lightweight filler material, such as hollow blocks, aerated concrete, and sometimes can be
composite wall pressure plate plus lightweight insulation layers, there are many beautiful houses facades lightweight
glass walls structure. Lightweight padding inside wall partitions can be hollow blocks, aerated concrete or light steel
keel gypsum board, at present there is also an aluminum frame and glass partition.

For light steel housing , the traditional asphalt roofing felt added layer uneconomical, now mostly using waterproof membrane.Roof also dig abandoned the traditional cement mortar and cinder insulation layer, and the use of lightweight insulation materials, such as JQN board, polyethylene concrete panels, variable thickness can be made to cancel the roof screeds on request.- Basic form the basis of multi-storey buildings Strut independent foundation, strip foundation, under the usual cruciform base column, and sometimes can raft foundation. When using an independent foundation under the column should be noted that each base is relatively uneven deposition on the upper part of the structure. Common foundation beams cast or precast reinforced concrete structures, and sometimes can also be used in accordance with the requirements of the steel foundation beams, but usually buried in the ground below the concrete pedestal and steel beam outsourcing to solve corrosion problems.

Multi-storey buildings constructed node multi-use welder shaped steel column or box section. Because labor-section of the web is thin, so in this weak axis and connected to a multi-hinged beam, while the strong axis using rigid form. Sometimes also using semi-rigid connection, but its force characteristics is more complex, often to get a more accurate design data through tests. Multi-storey buildings while relatively thin steel components should avoid the construction site of the weld joint. In order to enhance the overall stiffness of the structure can be made in the form of the secondary beam continuous beam.
Fire and corrosion protection of steel structures mainly of fire retardant paint, foam fire retardant paint layer and outsourcing methods. For steel components exposed, such as staircases and other coatings and paints, using 10 ~ 40mm thick coatings, fire resistance of up to 1.5 ~ 3h, paint and foam fire time is generally 0.5h. Hidden components, perlite and vermiculite fireproof spray or fireproof panels are cost-effective method, 30 ~ 40mm thick coating can achieve fire resistance of 1.5h, and to a certain degree of corrosion resistance both. Exposed steel components commonly used corrosion resistant coating or paint, primer and paint from components. At present, anti-corrosion coating is valid for 10 to 20 years, so to periodically re-painted. Galvanized steel sheeting itself has some corrosion resistance, at the time for the floor by means of fire-resistant coating to solve corrosion problems, but also for the roof and outside walls coated with organic coating, increasing its durable life.