What is rebar anchorage? What does it do?

Rebar anchorage. It is the length of the steel bar extending into the support, and the design and specification are specified, generally LAE (is the seismic anchorage length of the longitudinal tensile steel bar.

In any case shall it not be less than 250mmThe anchorage length refers to the length of the rebar extending into the concrete support. The anchorage length of the steel bar is to strengthen the mechanical occlusion between the steel bar and the concrete.

The above is to tell you the role of anchorage length, which can improve the seismic coefficient and strengthen the mechanical occlusion. It is best to reach the anchorage length, if your home is not an earthquake area and the economy is relatively tight. Anchorage lengths can be reduced.

But also at least 2 to 3 lengths of the column. If you don't bend the hook, you will never fall off, but the strength of the mechanical bite force of the beam and column is reduced. Reinforcement anchorage is the basis for the stress of concrete structures, reinforced concrete structures.

If the anchorage fails, the structure will lose its bearing capacity and lead to structural failure. The anchorage length of the steel bar generally refers to the total length of the stressed steel bar of beams, plates, columns and other components extending into the support or foundation, which can be anchored in a straight line and bent. Bending anchorage lengths include straight and bending segments.

The anchorage length of the steel bar generally refers to the total length of the stressed steel bar of beams, plates, columns and other components extending into the support or foundation, including straight lines and bending parts. The position and form of anchoring can be in the form of hooks, bending, etc., and can also refer to the length of the reinforcement anchored into the component, if there is not enough anchorage length, the reinforcement is stressed.

It cannot be effectively transferred to the anchor solid, and the anchorage length is specified to ensure the force transmission effect of the reinforcement. The purpose of the steel bar hook is to ensure the firmness of the component, increase the degree of combination between the steel bar and the concrete, so as to make the tail of the steel bar into a hook type to meet the design requirements. <>

Anchoring means that the reinforcement is wrapped in concrete, which strengthens the connection between the concrete and the reinforcement and makes the building stronger, with the aim of enabling the two to work together to bear various stresses (working together to withstand pressure, tension, bending moment, torque, etc. from various loads). The anchorage length of the steel bar generally refers to the total length of the stressed steel bar of beams, plates, columns and other components extending into the support or foundation, including straight lines and bending parts. The position and form of anchoring, can be used hook, bending and other forms, can also refer to the length of the reinforcement anchored into the component, if there is not enough anchorage length, the reinforcement force can not be effectively transmitted to the anchor solid, in order to ensure the effect of reinforcement force transmission, the specification stipulates that the anchorage length is not less than 200mm.

The reinforcement in the reinforced concrete structure can be stressed, mainly relying on the bonding and anchoring between the reinforcement and the concrete, so the anchoring of the reinforcement is the basis of the force of the concrete structure. If the anchorage fails, the structure loses its load-bearing capacity and thus causes structural failure. The anchorage of steel bars refers to the stretched steel bars of beams, plates, columns and other components extending into the support or foundation.

Anchoring refers to penetrating the weak surface with a borehole in a certain direction and penetrating into the complete rock body, inserting a prestressed anchor cable (steel bar), and then consolidating the hole with cement to form a structure with a certain tensile capacity. In addition, other support methods can also be used for the treatment of unstable rock mass of arch dam abutment, such as anti-slide pile, retaining wall, support column, etc. It should also be emphasized that groundwater is often the main factor leading to foundation instability, and the role of seepage prevention and drainage should be fully considered when setting up engineering treatment measures.

Rebar anchoring is divided into straight anchors and curved anchors. When the straight anchor length is insufficient, the curved anchor method can be used, and the anchorage length is lae, which is a straight section, and 15d is the anchor section after bending.

Rebar refers to steel for reinforced concrete and prestressed reinforced concrete, which has a circular cross-section and sometimes a square with rounded corners. Including round steel bars, ribbed steel bars, and torsion steel bars.

The process performance of performance steel bar includes many items, and different requirements can be put forward according to the characteristics of different products, such as bending and reverse bending (reverse bending) tests for ordinary steel bars, and repeated bending, torsion, and winding tests for some prestressed steels.

All of these tests simulate, to varying degrees, the process that may be involved in the actual use of the material, such as the need for hooks or bending of ordinary steel bars.

The prestressed steel wire sometimes needs to be wound, etc., and its purpose is to assess the ultimate bearing capacity of the material to these specific plastic deformations, so the process performance is also the plastic requirements of the material, and the above ductility (elongation) requirements are the same, generally speaking, the steel with large elongation has good process performance.

What are the anchoring forms of steel bars and what is the anchorage length?

Answer: Longitudinal steel bar hook and mechanical anchorage form, specific length requirements, see 11G101-1 page 55, too much; Anchor head (anchor plate) anchorage, straight anchor, see 11G101-1 page 79;

Anchorage length form: In addition to the above specified requirements.

You ask, "What is the anchorage length?" "According to different circumstances, it is necessary to check the table and calculate to decide. See page 53 of 11G101-1 for details, the anchorage length is not a fixed number, not a sentence, a paragraph can be said clearly.

Normal anchoring, foundation anchoring, beam anchor plate, beam anchor beam, plate anchor beam, ......A lot, it is recommended to refer to the 16G101 atlas, the anchorage length is different for different situations.

The simplest way to say is that the anchorage length is 15 18d (reinforcement design code) of your own reinforcement, and there are chemical, welded anchors.

The factors related to the anchorage length of the rebar are as follows:

1.Seismic rating of the building; 2.concrete strength grade; 3.rebar diameter; 4.rebar level; 5.The part where the rebar is located.

Specifically, the anchorage length of the steel bar refers to the length required for the stressed steel bar to transmit the force to the concrete through the bond between the concrete and the steel bar, which is used to bear the load on the upper part, and the concrete structure design uses a calculation formula to calculate the anchorage length, which contains a "steel bar shape coefficient" Bohe, which stipulates different coefficients for different types of steel bars such as smooth steel bars, ribbed steel bars, scored steel wires, spiral ribbed steel wires, steel strands, etc., and then in the anchorage form of steel bars, Factors such as the thickness of the concrete protective layer in the anchorage rotten silver section, the ratio of the design calculation area and the actual reinforcement area, the calculated anchorage length is corrected, and the reinforcement anchorage length can be obtained, although the result of such calculation is more accurate, but because there are too many data obtained, it is generally not adopted.

1. Reinforcement anchorage is to play a good role in the reinforcement structure through the connection between steel and concrete and anchorage. However, if the anchorage fails, the structure will lose its ability to exist and will lead to the destruction of the entire reinforced concrete structure.

2. Therefore, the anchorage of the steel bar specifically refers to the total length of the steel bars that are stressed into the support or foundation of some beams and columns of the mold hand. When calculating the anchorage of the reinforcement, it can also be based on its calculation formula, such as the tensile strength of the anchored reinforcement, and the design value has a direct relationship. In addition, it is related to its diameter and shape coefficient, and through a series of formula calculations, you can understand how much it is anchored.

Reinforcement mechanical anchorageYuanxin technology provides a new mechanical anchoring method for reinforcement anchorage in concrete structures, and the anchor plate that combines the nut and the backing plate into one is connected with the end of the reinforcement through a straight thread connection to form a reinforcement mechanical anchoring device. Its mechanism of action is as follows: the anchoring force of the steel bar is jointly borne by the cohesion force between the steel bar and the concrete and the local bearing pressure of the anchor plate or all by the anchor plate.

Technical indicators: Compared with the traditional mechanical anchorage technology of steel bars, the application of steel bar anchor plate in concrete structure can reduce the anchorage length of steel bars by more than 40 and save anchor steel bars by more than 40; The application of steel anchor plate in the frame node can save more than 60 steel for anchoring; The anchor plate and the end of the steel bar are connected by threads, which is quick to install, and the quality and performance are easy to guarantee; The anchor plate has the advantages of large anchorage stiffness, good anchoring performance, and convenient construction, which is conducive to commercialization; The structural form of mechanical anchorage of steel reinforcement of the top end node and the middle layer end node of several new types of concrete frame can greatly simplify the on-site construction of steel reinforcement engineering, avoid the problem of dense congestion of steel bar and difficult binding, and can improve the performance of the node under hail and wheel force and improve the quality of concrete pouring.

Scope of application: The mechanical anchorage technology of steel bars is suitable for the mechanical anchoring of hot-rolled ribbed and virtual steel bars in concrete structures, and the main scope of application is: replacing the traditional bending bars with steel anchor plates, which can be used for beam-column joints of frame structures; Instead of traditional bending bars and stirrups, it is used for simply supported beam supports; Reinforcement anchorage for concrete structure engineering such as bridges, hydraulic structures, subways, tunnels, and nuclear power plants; Fasteners used as rebar anchors (or tie rods), etc.