What Is Reinforcing Steel?

Rebar refers to steel for reinforced concrete and prestressed reinforced concrete. Its cross section is round, sometimes square with rounded corners. Including light round bars, ribbed bars, twisted bars.

When rebar processing is made, check the rebar processing table and the design drawing, and check whether there are any errors and defects in the blanking table.

Reinforcement process performance includes many items. Different requirements can be put forward for the characteristics of different products. For example, ordinary reinforcement requires bending and reverse bending (reverse bending) tests, and some prestressed steels require repeated bending, torsion, and winding tests.

The form of all these tests simulates to different degrees the process of materials that may be involved in actual use. For example, ordinary steel bars need to be hooked or bent to form, and prestressed steel wires sometimes need to be wound. The ultimate bearing capacity of deformation, so the process performance is also a requirement for the plasticity of the material, and is consistent with the above requirements for ductility (elongation). Generally speaking, steel with a large elongation has good process performance.

However, compared with the unidirectional stress state during stretching, the stress state of the process performance test is much more complicated. The deformation type and size of the sample are different in each direction (axial and radial). Particle size, harmful residual element content, especially any internal and surface defects that affect continuous deformation, such as cracks and inclusions, may affect and cause the test to fail. So in a sense, the process performance test can be said to be more stringent in assessing the quality of steel.

In addition, the reverse bending test of steel bars is essentially a strain aging sensitivity test. This is because molten steel generally contains a certain amount of free nitrogen (N), also known as residual nitrogen. When the content is too high, it can cause plastic deformation of the steel. After embrittlement at room temperature.

Because steel bars are often used after bending, plastic deformation has already occurred. If the material becomes brittle, the structure cannot bear the external load (such as earthquake) that causes the plastic deformation of the steel bars. Therefore, the bending test is used as a Important technical requirements are included in the steel bar standards, and the nitrogen content of steel is limited (not more than 0.012%).

Studies have shown that some elements used for micro-alloying of steel, such as vanadium, titanium, niobium, etc., especially vanadium has a good affinity with nitrogen. The addition of vanadium to steel can effectively combine free nitrogen, and the combination of vanadium and nitrogen can further To enhance the strengthening effect of vanadium on steel, some standards also state that "if there are sufficient nitrogen-binding elements, the nitrogen content can be higher than the standard requirement".

The anchoring agent is formulated with high-strength materials as aggregates, gelling materials as binding agents, and supplemented with high fluid micro-expansion and segregation prevention. No rust effect. Therefore, a certain anchoring force can be generated within a few hours. It has the characteristics of fast setting, fast hardening, high strength, no shrinkage, high shear strength, and small penetration resistance. this

Reinforced stirrups

10 @ 100/200 (2) means that the stirrup is 10, the spacing between the inset areas is 100, and the spacing between the non-encryption areas is 200, all of which are double limb hoop.
10 @ 100/200 (4) means that the stirrup is 10, the spacing between the inset areas is 100, and the spacing between the non-encryption areas is 200, which are all limb hoop.
(3) 8 @ 200 (2) means that the stirrup is 8, the spacing is 200, and the limb hoop.
8 @ 100 (4) / 150 (2) indicates that the stirrup is 8, the spacing between infill zones is 100, the limb hoop, the spacing between non-density zones is 150, and the limb hoop.

Reinforced beams

322, 320 means the upper rebar is 322, and the lower rebar is 320.
212, 318 means that the upper rebar is 212, and the lower rebar is 318.
425, 425 means that the upper rebar is 425, and the lower rebar is 425.
325, 525 means that the upper rebar is 325, and the lower rebar is 525.

Upper reinforcement of reinforced beam

Note: Marked at the support on the beam 220 represents two 20 rebars, which are arranged in length and used for double limb hoop.
222 + (412) means that 222 is a full length, and 412 stand bars are used for hexapod hoop.
625 4/2 means that the upper bar of the upper bar is 425 and the lower bar is 225.
222 + 222 means that there is only one row of steel bars, two at the corners and two at the middle, evenly arranged.

Reinforced beam waist and tendons

2 G212 represents the structural steel bars on both sides of the beam, one 12 on each side.
4 G414 represents the structural steel bars on both sides of the beam, two on each side of 14.
(3) N222 represents torsion bars on both sides of the beam, one 22 on each side.
N418 represents the torsion bar on both sides of the beam, two 18 on each side. ^[6]