According to what principle is the anchorage length of the rebar determined?

According to the seismic strength, concrete grade, steel bar grade, and steel bar diameter, there is a selection table of anchorage lengths on the atlas specification! Read more books and go to the scene to read, and you'll know!!

The strength of the concrete, the strength of the rebar, the adhesion between the concrete and the rebar.

The bending moment envelope diagram is obtained in combination with a large number of field tests.

How to take the anchorage length of the steel bar, such as the length of the curved anchor at the end of the beam in the column, whether the value is taken according to the concrete number of the beam or the concrete number of the column.

You go and see 03G101 and there's a specification in it

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.

You have to press the atlas to get up and down. Different concrete, different steel strength, different seismic grades, and different use environments are different.

Building seismic grade, concrete strength grade, steel bar diameter, steel bar grade, and the location of the steel bar.

The diameter of the reinforcement is related to the location of the reinforcement and the efficacy used.

For detailed data, please refer to the relevant specifications.

Factors related to the anchorage length of the reinforcement: the seismic rating of the building; concrete strength grade; rebar diameter; rebar level; The part where the rebar is located.

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 calculation of the anchorage length of the reinforcement is in accordance with the provisions of the Code for the Design of Concrete Structures GB50010-2010

When the tensile strength of the steel bar is fully utilized in the calculation, the basic anchorage length of the tensile steel bar (ordinary steel bar) should be calculated according to the following announcement:

lab=α×(fy/ft)×d。

where: lab is the basic anchorage length of the tensile reinforcement;

ft is the design value of the axial tensile strength of concrete;

For the shape coefficient of the anchor reinforcement, the light round reinforcement is taken, and the ribbed reinforcement is taken away;

fy is the design value of the tensile strength of the anchor reinforcement;

d is the diameter of the anchor reinforcement.

The anchorage length of the tensile reinforcement should be calculated according to the anchorage condition according to the following formula, and should not be less than 200mm:

la=ξaxlab

where: la is the anchorage length of the tensile reinforcement;

a is the anchorage length correction factor.

The anchorage length of the tensile reinforcement LA or LAE is related to the surface condition of the reinforcement, the strength grade of the reinforcement, the concrete grade at the anchorage of the reinforcement, the seismic grade of the structure, the diameter of the reinforcement, the construction work condition, etc.

It is not necessary for the construction party to calculate step by step according to the GB50010-2010 "Code for the Design of Concrete Structures", just according to the ** on page 53 of the 11G101-1 atlas, the corresponding search is obtained, and a simple calculation is obtained.

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.

The anchorage length of the structural column reinforcement in the foundation is la; When the axial compression: the straight line (vertical section) is not less than 12d (axial compression) +100mm, and when the eccentric compression: the linear line (vertical section) is not less than 15d (axial compression) +100mm

Expansion: <>

Rebar anchorage length.

anchoragelengthofsteelbar) is used to carry the load on the upper part by transferring the force to the required length of the concrete through the bonding of concrete and steel bar.

Representation method. Concrete structure construction drawing plane overall representation method, drawing rules and construction details 11G101 (hereinafter referred to as the "flat method") in the form of ** provides the minimum anchorage length of non-seismic longitudinal tension reinforcement LA and the seismic longitudinal tension reinforcement anchorage length LAE. Hunger Judgment.

Although it is not a norm, the method of multiplying the coefficient by the diameter of the steel bar to obtain the anchorage length of the steel bar is simple and feasible, and has been recognized by the design institute, and the construction cutting and quality inspection are very convenient. The design drawings often take the relevant content of the first as the design requirements for the anchorage length of the reinforcement, and some design drawings stipulate that the anchorage length of the reinforcement adopts the provisions of the flat method 11G101.