Now, a lot of large buildings are apply steel structure, which requires these steel building use large-span steel structure system , large-span steel roof usually has two forms : laying Roof Panel directly on steel frame call "None Purlin Roof Truss ; Put Purlin on fixed distance and laying Roof Panel on the Purlin called steel roof at intervals - Roof purlin steel structure system. Below is the introduction of Large Span Steel Structure Building System .
(1) None purlin steel structure system
None purlin steel structure the roof usually use large reinforced concrete roof panel , reinforced aerated concrete panels. Roof truss spacing should be comply with the length. The roof is usually used waterproof membrane roofing, generally applicable to cabin surface slope. When the roof with insulation needs, you can set the roof on the first insulation layer, usually foam concrete, aerated concrete, cement, lime coke residue, such as perlite perlite mortar or asphalt.
None purlin steel structure with the advantage of steel structure roof types and quantities small, simple structure, easy to install, easy to facilitate the laying of insulation layer waterproof layer, etc., while the roof of the stiffness, good integrity, and is more durable; disadvantage Is roofing weigh more heavy , the Steel frame and the lower section of roof materials have a corresponding increase and not good for seismic . And lifting components relatively heavy Therefore, no purlin steel structure used in the stiffness requirements higher than medium-sized factories and civilian, public buildings.
(2) The purlin steel structure system
The purlin steel structure, usually placed on the lightweight roof sheet on the roof purlins, the situation is no more roof insulation, such as waveform asbestos, corrugated iron, prestressed concrete tank tile, Slate, etc. ferrocement fold, but also in put the wood sheathing purlin capped, and then placed clay tile, cement tile and so on. General requirements for steel structures above the roof steep roof slope for drainage, and often use a triangle roof.
There purlin steel system advantages are available to more types of roofing materials, roof pitch and roof arrangement is more flexible, lightweight components, material saving, transportation and installation lighter; drawback is roof components over the types and quantities much more complex components, lifting installation more often, rub large amount of steel, and the overall stiffness of the roof is poor, so it is commonly used in steel structure purlin stiffness less demanding small plants and civil construction; but , the adoption of new and lightweight roofing materials and take appropriate structural measures, has recently also gradually used in larger industrial plants and civilian, public buildings. These two large-span steel structure system is now commonly used in large-scale steel building systems. We now common large stadiums, concert halls, cinemas and other large span steel buildings are used both systems.
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