What kind of reinforcement does HHR stand for, and what does HA stand for

HR hot-rolled steel.

The full name of HRB series steel bars is"Hot-rolled ribbed steel bars for reinforced concrete"The full name of RRB series steel bars is:"Reinforced concrete is reinforced with waste heat treatment of steel bars"The same strength grade (generally 400MPa level, that is, RRB400) in the two types of steel bars, its main technical indicators are basically the same mechanics, and the weldability of waste heat treatment steel bars can be compared with hot-rolled steel bars, there are certain differences, and the ductility and strong yield ratio are slightly lower. As a result, there is a practical difference in the scope of use of hot-rolled steel bars in engineering applications. The hot-rolled steel bar (grade HRB series) has an AGT specification of not less than, and the elongation is 16 17.

It can be applied to reinforcement layouts with high ductility to help. When the upper limit of the yield strength of the reinforcement and the requirement of the strong yield ratio of the reinforcement to be helped by the layout design are reached, it can meet the requirements of various layouts (including.

The design and use of the first and second level seismic layout) should be helpful. After hot rolling, the steel bar with controlled cooling and self-tempering treatment (grade RB series) has an AGT specification of not less than 14 16. It can be applied to general layouts and seismic ratings.

The design and use of the seismic layout of the third and fourth should be helpful.

Please see. GB1499 "Hot-rolled Ribbed Steel Bars for Reinforced Concrete" National Standard Revision Instructions.

Does the landlord refer to the hhr185 steel, the die steel, not the rebar?

Are you sure it's rebar? I deal with steel bars all day long, but I don't know there are such steel bars.

Domestic grade steel bar.

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 steel bar for reinforced concrete refers to the straight bar or wire strip steel used for reinforced concrete reinforcement, and its shape is divided into two types: light round steel bar and deformed steel bar, and the delivery state is straight bar and disc round.

Requirements: (1) The surface of the steel bar should be clean, and the adhered oil, mud and floating rust must be cleaned before use, and the rust can be removed in combination with the cold drawing process.

2) Straightening of steel bars, which can be straightened mechanically or manually. The straightened steel bar shall not have local bending, dead bending, and small wavy shape, and its surface scars shall not reduce the steel bar section by 5%.

3) The steel bar should be cut according to the steel bar number, diameter, length and quantity, the length of the match, first break the long material and then the short material, and minimize and shorten the short end of the steel bar to save steel.

In the calculation of the plate reinforcement, ha—the width of the support.

The rebar symbol RH rebar symbol with lowercase [T] in the upper corner refers to [cold-rolled ribbed rebar], L is cold-drawn rebar, B is cold-drawn rebar, HT is heat-treated rebar, P is smooth rebar, H spiral rib rebar, I is notched rebar, S is steel strand, R is cold-rolled torsional rebar. Such instructions are found in the rebar material book.

Rebar symbol for HRB500.

See screenshot below: <>

What level of reinforcement does it belong to? It is customary to call it grade rebar, which is no longer suitable for the current norms! GB has cancelled HRB335, so it is customary to call the level.

The steel bar will be eliminated and disappeared, and the number of graded preparations that are used to being called will be broken! And GB is clear in the classification and grade: steel bars are based on yield strength.

The eigenvalues are graded into grades. It is even more mixed with the "dust search and destruction level" that is used to calling "several levels of steel bar". So the habit of calling several levels of steel bars should be abandoned! Strive to keep pace with the times!

<> information on filial piety: GB T steel for reinforced concrete leakage belt Part 2: hot-rolled ribbed steel bar.

The symbol of the rebar of HRB500 is , which belongs to the fourth grade of hot-rolled ribbed steel bar, and the yield strength is not less than 500MPa.

Classification of reinforcement for commonly used concrete components:

1) Stressed steel bar. Also known as the main reinforcement, it is arranged in the bending, tension, eccentric compression or tension area of the member to withstand the tensile force.

2) Erection of steel bars. Also known as structural reinforcement, generally do not need to be calculated and configured according to the structural requirements, such as 2 12, used to fix stirrups to form a steel skeleton, generally in the upper part of the beam.

3) Steel bar with hook, refers to the steel bar with hook at the end, and the hook is usually divided into 3 types: semicircular hook, oblique hook and straight hook.

4) bent steel bar, mainly used near the beam, plate bearing, the angle of the bent steel bar in the beam is generally 45 degrees, when the beam height is greater than 800mm, it is advisable to use 60 degrees, and the angle of the bent steel bar in the plate is generally less than or equal to 30 degrees.

5) Stirrups. The stirrup is shaped like a hoop, which is used in beams and columns, which plays the role of resisting shear force on the one hand, and the role of fixing the position of the main reinforcement and erecting the reinforcement on the other hand. It is perpendicular to the main rib setting, and forms a reinforcement skeleton with the stressed rib and the erection bar in the beam, and forms a reinforcement skeleton with the stressed rib in the column.

6) Distribute ribs. Perpendicular to the stressed reinforcement in the slab to ensure the position of the stressed reinforcement and to transmit the internal forces. It can distribute the external force of the component over a wide range to improve the force situation.

7) Additional reinforcement. Additional reinforcement increased due to changes in the geometry or stress of the component, such as suspension bars, waist bars, etc.

HRB500 grade steel bar, which is grade 4 steel, the symbol is shown in the following table.

The rebar symbol of HRB500 represents the fourth grade and belongs to the fourth grade of rebar.

Reinforcement symbol refers to the symbol of reinforcement parameters, etc. The unit of measurement for calculating the theoretical weight of steel is kilograms (kg). When the steel bar is processed and produced, the steel bar processing table and the design drawing should be reviewed to check whether there are errors and omissions in the blanking table.

Each kind of steel bar should be checked according to the material table to meet the requirements, after these two inspections, and then according to the material table to release the real sample, trial production can be made in batches after passing the test, and the processed steel bar should be stacked neatly and orderly.

Main uses: HRB500 grade steel bar in strength, ductility, high temperature resistance, low temperature performance, seismic performance and fatigue performance are greatly improved than HRB400, mainly used in high-rise, super high-rise buildings, long-span bridges and other high-standard construction projects, is the international engineering standards actively recommended and has been widely used in developed countries products, HRB500 steel engineering application practice shows that can save a lot of steel, with obvious economic and social benefits.

Grade 4 rebar

HRB500 is a kind of hot-rolled ribbed grade steel bar specified in the national standard, formerly known as four-grade steel bar, with a yield strength of not less than 500MPa and a diameter of 6 100mm. The grade reinforcement in the old standard is renamed HRB500 grade reinforcement under the new standard. The grade of hot-rolled ribbed steel bars consists of HRB and the minimum yield point of the grade.

H, R, and B are the first letters of the three words "hotrolled", "ribbed" and "bars", respectively.

Hot-rolled ribbed steel bar, yield strength not less than 500MPa,

Level 4, the symbol is two vertical in the middle, one horizontal at the top and one horizontal.

The national mandatory standard for hot-rolled ribbed steel bars for reinforced concrete has been implemented since March 1, 2008, and the new standard replaces GB1499-1998 "hot-rolled ribbed steel bars for reinforced concrete" and GB13014-1991 "waste heat treatment steel bars for reinforced concrete", compared with the original standard GB1499-1998, the new standard logo and some technical requirements have changed greatly.

Grade Grade Composition English letter meaning.

HRB335 is composed of the minimum yield strength specified by HRB+, which is the abbreviation of HRB - Hot Rolled Ribbed Bars.

hrb400

hrb500

HRBF335 is composed of the minimum yield strength specified by HRBF+: HRBF- The first letter of "fine" is added to the English abbreviation of hot-rolled ribbed steel bar.

hrbf400

hrbf500

3) There is a big change in the sign of ribbed steel bar. In addition to the grade mark on its surface, the ribbed steel bar can be rolled with the registered factory name (or trademark) and the diameter millimeter number in turn. The steel bar grade is represented by Arabic numerals and English letters, HRB335, HRB400, HRB500 are represented by HRBF335, HRBF400 and HRBF500 respectively; The name of the factory is indicated by the prefix of Chinese pinyin; The number of millimeters in diameter is expressed in Arabic numerals.

Compared with the provisions of the old standard HRB335, HRB400 and HRB500 respectively, there are great changes, which should attract the attention of relevant construction, supervision and testing personnel. That is to say, today see the surface of the steel bar engraved with "4", that is, HRB400, that is, the so-called grade rebar, but in the future the grade rebar is not called, it is called HRB400, the same, today see the surface of the steel bar engraved with "3", whether it is the previous grade steel, or grade steel, it should be carefully checked.

The rebar level and symbol are represented by:First, the main reinforcement on the beam and the main reinforcement under the beam are expressed at the same time

3 22, 3 20 means that the upper reinforcement is 3 22, and the lower reinforcement is 3 20.

2 12, 3 18 means that the upper reinforcement is 2 12, and the lower reinforcement is 3 18.

4 25, 4 25 means that the upper reinforcement is 4 25, and the lower reinforcement is 4 25.

3 25, 5 25 means that the upper reinforcement is 3 25, and the lower reinforcement is 5 25.

Second, beam upper reinforcement representation method: (marked at the beam upper support) 2 20 represents two 20 steel bars, through the length arrangement, for double limb hoops.

2 22 + (4 12) means that 2 22 is the length and 4 12 vertical ribs.

For hexa-limb hoops.

6 25 4 2 means that the upper row of reinforcement is 4 25 and the lower row is 2 25.

2 22 + 2 22 means that there is only one row of reinforcements, two in the corners and two in the middle, evenly arranged.

Third, the beam waist in the reinforcement representation method:

g2 12 represents the structural reinforcement on both sides of the beam, one 12 on each side.

G4 14 represents the structural reinforcement on both sides of the beam, with two 14s on each side.

N2 22 indicates the torsional reinforcement on both sides of the beam, one on each side 22.

N4 18 represents the torsional reinforcement on both sides of the beam, two 18 on each side.

Fourth, the lower part of the beam reinforcement representation method: (marked in the lower part of the beam).

4 25 means that there is only one row of main reinforcements, and 4 25 all extend into the support.

6 25 2 4 means that there are two rows of reinforcement, the upper reinforcement is 2 25, and the lower reinforcement is 4 25.

6 25 ( 2) 4 means that there are two rows of reinforcement, the upper reinforcement is 2 25, does not extend into the support, and the lower reinforcement 4 25, all extends into the support.

2 25 + 3 22( 3) 5 25 means that there are two rows of tendons, and the upper tendons are 5. 2 25 extends into the support, 3 22, does not extend into the support. The lower rib is 5 25, and the length is arranged.

In the reinforcement, "hc" is the size of the long side of the column section (the cylinder is the section diameter).

hn" is the clear height of the column on the floor.

Reference: 16G101-1 (instead of 11G101-1) concrete structure construction drawings plane overall representation method slag preparation rules and structural details (cast-in-place concrete frame staring frame, shear wall.

beams, plates).