Although concrete filled steel tube is composed of two materials, it is regarded as a new material for the component industry, that is, the so-called "composite material" (no longer distinguish between steel tube and concrete).Moreover, the performance of concrete filled steel tubular members under different load combinations is continuous and uniform.The properties of concrete filled steel tube (CFST) members are continuous and uniform with the change of geometric parameters, such as steel ratio, length-fineness ratio and hollow ratio.The performance of concrete filled steel tube components is continuous and unified with the change of physical parameters, such as the strength of steel and concrete.The properties of concrete filled steel tube (CFST) members are continuous and unified with the changes of their section shapes, such as circle, polygon, octagonal, hexagon and square.
Under the guidance of "unified theory of concrete filled steel tube", the mechanical properties and design methods of high-strength concrete filled steel tube, as well as the fire resistance and fire prevention design methods of concrete filled steel tube have been studied in the industry.
Research on the properties of high-strength concrete filled with steel tubes high-strength concrete (the definition of high-strength concrete varies from country to country. In China, high-strength concrete with strength grade C60 or above is generally considered as high-strength concrete) is a hot topic studied by scholars at home and abroad in recent years.This kind of high strength concrete has the advantage of high strength, can save cement, reduce the section size of components, reduce the weight of the structure, so it is often used in the structure with a large load, such as high-rise buildings, underground engineering and long-span structure of the pillar.However, the weakness of high strength concrete is brittle, ductility difference is large, which will hinder its application in practical engineering, especially in the complex state of stress, the structure by brittle failure control, the reliability of its work greatly reduced.If high-strength concrete is poured into high-strength concrete filled steel tube, high-strength concrete will be effectively restrained by the steel tube, and its ductility will be greatly enhanced.In addition, the steel pipe has great shear and torsion resistance under complex stress.In this way, through the combination of the two, can effectively overcome the high strength concrete brittleness, ductility of the weakness of the large, so that the high strength concrete engineering application can be realized, economic benefits can be fully played.A large number of examples have proved that compared with ordinary strength concrete filled steel tube and steel column, high strength concrete filled steel tube can save about 50% of steel and reduce the cost.Compared with reinforced concrete column, there is no need for formwork, and more than 50% of concrete can be saved, and more than 50% of the dead weight of the structure can be reduced, while the steel consumption and cost are slightly more or about the same.
In addition to other advantages of ordinary strength concrete filled with steel tubes, concrete filled steel tubes formed by filling high-strength concrete inside the steel tubes can save at least 60% of the concrete and reduce the dead weight of the structure by more than 60%.
Because concrete filled steel tube is a new type of structure, there is no fire prevention standard for this kind of structure in China.Therefore, it is very important to study the fire resistance of concrete filled steel tube and determine its fire prevention design method and standard.
Cangzhou Steel Pipe Group (CSPG) Co., Ltd
Cangzhou Steel Pipe Group (CSPG) Co., Ltd. is a large-sized, key metallurgic enterprise of Hebei Province in North China, whose history dates back to 1994. CSPG currently em/paces six member companies with products varying from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies an area of 600,000 square meters with a total asset of $530 million.
Specialized in the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy resin cement mortar two cloth three oil buried pipeline IPN8710 non-toxic drinking water internal and external plastic coated lining plastic and other anti-corrosion pipe fittings for oil and gas pipeline water conservancy projects
Executive standard :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555
Business scope: 21.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners