How many times the length of the curved anchor is said in the construction specification, is it a st

The bending anchor is 90 degrees, the bending anchor to the column is, and the bending anchor to the beam is... How many times d is the bending section.

The anchorage of steel bars is divided into three ways: direct anchoring, mechanical anchoring and welding anchoring, and the bending anchor of steel bar belongs to the mechanical anchorage of steel bar, and its anchorage length includes the length of the hook and straight section.

Its general calculation formula is la=a (fy ft) d, where la is the anchorage length of the reinforcement (mm);

A is the shape coefficient of the steel bar, when it is a light round steel bar, a is taken, when it is a ribbed steel bar, a is taken, when it is a cold-rolled ribbed steel bar, a is taken;

fy is the design value of the tensile strength of the reinforcement, ft is the design value of the axial compressive strength of the concrete, and d is the diameter of the reinforcement (mm); FY and FT can be found in 03G101, in addition, after meeting the above formula, it must also meet the requirements of the minimum anchorage length of seismic and non-seismic tensile steel bars in 03G101, and the anchorage length is not less than 250mm at any time.

The minimum length of the steel bending anchor is 15d, and the required anchorage length of the steel bar should also be ensured, there are 2 kinds, lae or la, after these 2 calculations, the maximum length is taken as the anchorage length.

You have to check the atlas, the anchorage length and the diameter of the rebar, the thread or the light circle, the strength grade of the concrete, the seismic grade are all related, and it is too much to send out.

When the length of the straight anchor (12d) at the bottom of the non-frame beam is not enough, the length of the bent anchor should be 15d, because when v, the ribbed reinforcement lam 12d, and the smooth reinforcement lam 15d.

If the anchorage length of the longitudinal stressed steel bar extending into the beam support range does not meet the above requirements, effective anchoring measures such as welding the anchor steel plate on the steel bar or welding the end of the steel bar on the embedded part of the beam end should be taken.

Parametric analysis. The reinforced concrete independent beam supported on the masonry structure shall be equipped with no less than two stirrups within the anchorage length las range of the longitudinal stressed steel bar, and its diameter shall not be less than the times of the maximum diameter of the longitudinal stressed steel bar, and the spacing shall not be greater than 10 times the minimum diameter of the longitudinal stressed steel bar; When mechanical anchoring measures are taken, the stirrup spacing should not be greater than 5 times of the minimum diameter of the longitudinal stressed steel bar.

For the simply supported ends of simply supported beams and continuous beams with concrete strength grade of C25 and below, when there is a concentrated load within the range of the support edge and V is >, additional anchoring measures should be taken for the ribbed steel bars, or the anchorage length las 15d should be taken.

[Structural Engineer].

11G101-1 beam construction method.

Or go deeper than and then bend up at a right angle for 15d

Or straight anchor la, 135° hook.

What kind of beam are you talking about non-frame beams?

After reaching the inside of the longitudinal bar of the beam, it is necessary to bend the anchor upwards to meet the LAE, which is the safest way.

The length of the curved anchor is specified as follows:

The code requires that the horizontal length of the hook bend is 10d (d is the diameter of the rebar) and is not less than.

Mixed structure walls should be set along the height of 500mm 2 6 horizontal tie ribs. Each extension into the wall should not be less than. If the drawings are not done, the length of the hook is required to be in accordance with the construction length.

Generally, it is mostly 90° hook, and the hook length is not less than 6d, generally 15d). Royal slag.

What is the length of the frame structure brick masonry structural column tie bar anchored into the wall? The two ends of the tie bar generally extend into the masonry 700mm, extend into the concrete 200, and there are right-angle hooks at both ends.

Difference Between Straight Anchor and Curved Anchor:

1. The structure is different.

The bent anchor is a straight section with a 90° bend at the end, or a 135° hook at the end; Straight anchor only has a straight section without bending, and the end is bent.

2. The length of the anchor is different.

The length of the anchor horizontal section of the steel bar straight anchor is not less than, and the length of bending and breaking is 15d; The anchorage length of the rebar bending anchor is la.

Both the bending anchor and the straight anchor rely on the bonding and anchoring between the steel bar and the concrete. When the longitudinal stressed steel bar is anchored, when the requirements of the straight anchor cannot be met, the form of 90° hook can be arranged at the end of the steel bar.

Both straight and curved anchors are important components used to connect rebar and lead mixed concrete in concrete structures, and their main difference lies in the shape and direction of the rebar when it is anchored into the concrete.

A rebar straight anchor, also known as a straight anchor, is a type of anchoring in which the rebar is held on the other side after passing through the concrete member. When anchoring into concrete, the direction of the reinforcement is perpendicular or approximately perpendicular to the concrete surface, and the reinforcement is usually straight, because it is called a straight anchor.

Rebar bending anchors, also known as bending anchors, are a type of anchoring of rebar on the other side after passing through a concrete member. When anchoring into concrete, the direction of the rebar and the surface of the concrete are oblique, and the rebar is bent into a certain shape before passing through the concrete, hence the name of a curved anchor. <>

Summary. Algorithm for the length of the upper and lower through steel bars Formula: length = net span length + left support anchorage + right support anchorage a

When the beam support is wide enough, the upper and lower longitudinal bars are directly anchored in the bearing, and the following conditions should be met. What is the calculation formula.

The upper and lower part of the through steel bar long dismantling algorithm formula: length = net span length + left support anchorage + right support anchorage aWhen the beam bearing is wide enough, the upper and lower longitudinal bars are directly anchored in the support stove seat, and the following conditions should be met.

The straight section stretches into the bearing enough lae to be able to straighten the anchor, if not enough, the anchor is bent. Straight anchor LAE according to the concrete number, seismic grade to take lead pure value trouser mold different, curved anchor, straight section = curved hook = 15DIf the straight section of Huaifeng is not enough 0

Hook = 15dIf the straight section is not enough, stretch to the edge of the support shed and add 15D bending hook. 2. The length of the straight anchor of the steel bar is the length of the trouser Hui lae, and the length of the bending anchor of the beam reinforcement is the calculation of the bending, which is related to the strength grade of the steel bar, the strength grade of the anchor into the concrete, the seismic grade of the structure, and the diameter of the steel bar

HC C Lae (seismic anchorage), if the formula is satisfied, the anchor can be straight. And judging whether it is a straight anchor has nothing to do with it, only after judging that it can be directly anchored, it has a relationship.

In the construction of steel anchorage, if the length of the straight section is greater than LAE, the straight anchor can be used. However, the reinforcement of the beam also needs to pass through the center of the column for 5d. If the length of the straight section does not meet the requirements of the anchorage length, then the curved anchor is used.

Specification for the length of the rebar anchorage.

In the basic theory of concrete structure, limited by the ultimate strain value of concrete, the reinforcement that is too high strength can not play its full role (this is the theoretical basis that the concrete design code and the construction code do not set the grade reinforcement).

Therefore, even if it is a grade reinforcement, its strength design value can only be taken to 360n mm2 (the same as grade reinforcement), and when used for axial tension and small eccentric tension members, it can only be taken at 300n mm2. Therefore, the anchorage length of the reinforcement higher than the grade can be measured by the grade reinforcement.

The plastic properties and weldability of grade steel bar are worse than the new grade steel bar, and it is not suitable to be used in ordinary concrete structure, and it is not economical.

The straight section stretches into the bearing enough lae to be able to straighten the anchor, if not enough, the anchor is bent. According to the concrete number, the seismic grade of the straight anchor LAE is different, see page 34 of 03G101-1 for details. Bending anchor, straight section = bending hook = 15d

If the straight section is not enough, extend to the side of the support and add a 15D bending hook.

If the straight anchor is not enough, the anchor must be bent, and the straight anchor has a good effect.

The length of the straight anchor of the reinforcement is lae, and the length of the bending anchor of the beam reinforcement is 15d.

The calculation of LAE is related to the strength grade of the reinforcement, the strength grade of the anchored concrete, the seismic grade of the structure, the diameter of the reinforcement, etc., and does not need to be calculated by the constructor, and the table can be found on the general description of the construction, or page 53 of 11G101-1, as long as the "right number is seated".

The anchorage length of the tensile reinforcement, the anchoring length of the tensile reinforcement should be calculated according to the following formula: ordinary reinforcement la=a(fy ft)d, prestressed reinforcement la=a(fpy ft)d in the formula fy, fpy—the design value of the tensile strength of ordinary reinforcement and prestressed reinforcement.

ft—the design value of the axial tensile strength of concrete, when the concrete strength grade is higher than C40, the value is taken according to C40; d—diameter of reinforcing bar; a—the shape coefficient of the reinforcement (smooth reinforcement a=, ribbed reinforcement a=.)

When the thickness of the concrete cover of HRB335, HRB400 and RRB400 reinforcement in the anchorage area is greater than 3 times the diameter of the reinforcement and is equipped with stirrups, the anchorage length can be multiplied by the correction factor.

The length of the straight anchor of the steel bar is different from the length of the curved anchor, and the curved anchor is 15d, so how to calculate the length of the straight anchor?

The length of the straight anchor of the steel bar is different from the length of the curved anchor, the curved anchor is 15d, A: There are too many differences, not only "the curved anchor is 15d":

1. The difference between straight anchor (no bending) and bent anchor (bending 15d);

1. The length of the straight anchor of the steel bar should meet: the greater of the two (with a protective layer).

2. The length of the bending anchor should be satisfied: extend to the inside of the longitudinal bar on the outside of the column.

Second, the end support is represented by symbols to indicate the length is different, lae (seismic anchorage length) labe (seismic "basic" anchorage length), the same seismic anchorage length but the difference between the word "basic".

Third, the length of the straight section is different

The ratio of the value of the straight anchor of the end support (not compared with the curved anchor of the end support) and the curved anchor of the end support, without special circumstances, is shorter! But to bend 15d.

So how do you calculate the length of a straight anchor?

A: Straight anchor length calculation:

1. If the conditions do not appear, the anchorage length of the tensile steel bar is corrected by teaching a. Only inform: type of reinforcing bar, seismic grade, concrete strength grade.

The builder does not need to calculate, according to the general description of the structure construction or with the 11G101 atlas, directly check the table (labe), so the lae labe. Such as: type of reinforcement:

HRB335, seismic grade: first grade, concrete strength grade: C35.

When the type of reinforcement: directly look up the table lae labe 31d.

2. But once a appears, it must be calculated. Such as: type of reinforcement:

HRB335 28, seismic grade: first, concrete strength grade: C35.

First, look directly at LABE 31D. Now HRB335 is 28, A, then lae a(labe) up.

I won't give an example (just know that hc is the bar height parallel to kl). If the calculated value of is greater than the LAE value, please follow the requirements of the former.

Your question: End support straight anchor, end support curved anchor, please see: 11G101-1 page 79.

04la+15d

Refers to the straight anchorage length (the specific LA length is determined by the code or design), and 15d refers to the rebar hook length (the length from the bend start to the end of the rebar).

End support straight anchor The width of the support is lae and , which is a straight anchor, take max. This is to illustrate that when the end support can use a straight anchor, the width of the support must meet the lower limit, which must be greater than, otherwise the anchor can only be bent. When these two conditions are met at the same time, the anchor can be straightened.

The concrete design code (GB50010-2010) stipulates that "when the beam height is greater than 300, the beam longitudinal reinforcement should not be less than 10mm, and when the beam height is less than 300, the beam longitudinal reinforcement is not less than 8mm," when the support width = 700, according to the minimum steel bar diameter of 8mm, the first level seismic LAE =, at this time greater than LAE, obviously to take, this is to take MAX.

The length of the anchor is 15d.

The anchorage length of the horizontal rib of the shear wall, if the end is the frame column, the anchorage length is lae, if the length of the wheel in the anchorage is insufficient, the length can be bent to increase the length, the bending length is 15d, if it is a corner position, the length of the bending part of the outer horizontal rib is; If the end is a dark column, the horizontal bar should extend to the inside of the vertical reinforcement of the dark column and add a bending length of 10d 15d, if it is a corner position, the length of the outer horizontal bar should be bent is.

Analysis of horizontal ribs:

1. If the beam anchor column meets the straight anchor, it will be directly anchored. If the straight anchor is not satisfied, the anchor will be bent, and the bending anchor should be greater than or equal to the bending length of 15d. This is the anchorage length of the frame dye, not the frame dye:

l (non-frame dyeing) upper ribs: straighten the position of the edge of the support is greater than or equal to the position of the downward tung debate 90 degrees bend the anchor, and the length of the bend is 15d.

2. Lower rib: can be straight anchor 12d, when the length of the straight anchor is not enough, it can extend into the position of the edge of the support is greater than or equal to 90 degrees upwards to bend the anchor, and the length of the bent anchor is 15d. <>