reinforcement is an important part of reinforced concrete structures, designed for taking heavy loads.We can say that the strength and endurance of the steel bars depends largely on the reliability and performance of the facilities.Classes fittings reflect the mechanical, chemical and physical properties, the technology rolled ways posleprokatnoy processing, corrosion resistance, and a number of other parameters of the bearing elements of any modern facilities.
known that the construction of the building is constantly experiencing different kinds of loads from the mass in the building equipment, machinery and furniture and up to a total weight of people and structural elements of the building.And all kinds of stress have different effects on the load-bearing elements.They can compress them, stretch or bend.Also, the strength of these different loads.
All classes reinforcement, having individual qualities, intended for making various efforts.For example, operating valves perfectly withstands even the most adverse load for the building - the tensile forces generated by external factors and its own weight concrete.The building elements such as columns and supports, this type of fittings takes major compressive forces.However, only this type of steel bars is not sufficient to give the construction the necessary strength.
Therefore, in addition to working reinforcement design of most modern buildings the distribution designed for even distribution of efforts between the rods and the assembly, which performs the function of combining the individual steel elements to a single rigid frame.To prevent the formation of cracks in the oblique design introduces additional high-rods, braces, straps and hooks.
All classes reinforcement designated by an alphanumeric index from A-1 to A-6.The higher this designation, the stronger the bars themselves.From this it depends on the scope of these construction elements.For example, fittings class A1 is a smooth hot-rolled steel rods.It is mainly used in buildings that are not subject to high loads and stress.Valves of this class is mounting, design and cross-members.It has good weldability.
Other classes fixtures, starting with A-2 and above are hot-rod elements periodic profile.Typically such rods after rolling undergo thermochemical treatment, which increases their strength.The use of class A-2 is almost the same as A-1.Except for the bars made of steel St 5 and having a diameter greater than 32 mm, such as when welding rods, they do not give sufficiently reliable weld.
Valves Class A3 is widely used in the manufacture of conventional reinforced concrete structures, where it serves as a working component.It also exhibits good weldability.Class A-4 has a much higher strength than the previous ones, and therefore used as a tendon (carrying) element.The weldability of such valves is satisfactory, although somewhat inferior to the previous classes.Therefore, this category of web interface method, which is called the crimped clip.Rebars class A-5 and A-6 are extremely strong construction elements.They are used in the construction of long span structures with no less than twelve meters.This fixture is able to withstand very high loads and efforts.
