How to represent the infill area of the reinforcement and how to calculate the infill area of the co

Summary. 1. The reinforcement column infill area is based on the upper end of the bottom column and the two sides of the columns of other layers, take the size of the long side of the rectangular section column or the diameter of the circular section column, one-sixth of the column net height and 500mm, and the maximum value of the three is used as the range of stirrup infill area. The range of 500mm above and below the bottom column is the stirrup infill area.

For the ends of the columns of the reinforced concrete frame and the ends of each layer of beams, they were infilled.

2. When the seismic grade is level 1, the beam height and 500mm of the length of the infill area are 2 times, and the maximum value of the beam height of 500mm is the length of the infill area when the seismic grade is 2 to 4.

3. In addition to the encryption of the beam on the column, stirrups are also required when crossing. The additional stirrups of the beam are generally 3 sets, and the spacing of the additional stirrups is 50, which is added to the place where the beam and the beam intersect. Beam and beam intersection, there is a main beam and a secondary beam, the general main beam encryption stirrups will be added, and the secondary beam can not be added according to the situation.

4. The foundation stirrups are arranged, the stirrup encryption cannot be less than 500, the column reinforcement is inserted into the foundation, and the stirrups in the foundation layer are not less than 2 sets of closed stirrups.

How to calculate the infill area of column reinforcement?

1. The reinforcement column infill area is based on the upper end of the bottom column and the two sides of the columns of other layers, take the size of the long side of the rectangular section column or the diameter of the circular section column, one-sixth of the column net height and 500mm, and the maximum value of the three is used as the range of stirrup infill area. The range of 500mm above and below the bottom column is the stirrup infill area. For the ends of the columns of the reinforced concrete frame and the ends of each layer of beams, they were infilled.

2. When the seismic grade is level 1, the beam height and 500mm of the length of the infill area are 2 times, and the maximum value of the beam height of 500mm is the length of the infill area when the seismic grade is 2 to 4. 3. In addition to the encryption of the beam on the column, stirrups are also required when crossing. The additional stirrups of the beam are generally 3 sets, and the spacing of the additional stirrups is 50, which is added to the place where the beam and the beam intersect.

Beam and beam intersection, there is a main beam and a secondary beam, the general main beam encryption stirrups will be added, and the secondary beam can not be added according to the situation. 4. The foundation stirrups are arranged, the stirrup encryption cannot be less than 500, the column reinforcement is inserted into the foundation, and the stirrups in the foundation layer are not less than 2 sets of closed stirrups.

5. The distance between the stirrups and the bottom surface and the top surface of the foundation is 100, the stirrup spacing is 500, and the stirrups on the top surface of the foundation are 50 to start arranging. 6. The encryption area of other floor pillars is divided by the floor, and the height above and below the floor is one-sixth of the encryption, for example, the height of the floor-to-floor pillar is 3 meters, then the upper and lower should be encrypted with one-sixth of the height, that is, the upper and lower encryption is 50cm.

Dear, I hope it can help you.

The stirrup spacing of the column is calculated according to the stress of the column, but the spacing of some sections of stirrups will encrypt the general provisions of the column infill area: 1. There are three stirrup infill areas in the first layer (the first layer here refers to the first layer on the foundation):

1. The length of the lower stirrup encryption area is taken as 1 3 The net height of the column, such as the net height of 3 meters, the encryption area is 1 3, that is, 1 meter;

2. The length of the upper stirrup encryption area is 500mm, the size of the long side of the column, and the maximum value of 1 6 net height;

3. The stirrups of the column at the junction of the beam and column are encrypted.

4. If the longitudinal reinforcement of the column adopts lashing lap, then the lap range needs to be encrypted.

The stirrup encryption range is:

The length of the column root infill area of the bottom column (the root of the bottom column refers to the top surface of the basement or the top surface of the foundation without the basement) should not be less than 1 3 of the net height of the column in the layer, and the range of the infill area after is the maximum of the three values of the column length (diameter of the cylinder), 1 6 of the net height of the floor column, and 500mm.

The encryption range is specified in the specification, and there is no specific calculation formula.

The stirrup encryption range is:

The length of the infill area of the root of the bottom column (the taproot of the bottom column refers to the top surface of the basement or the top surface of the foundation without the basement) should not be less than 1 3 of the net height of the column in the layer, and the range of the subsequent infill area is the maximum of the three values of the column length (diameter of the column), 1 6 of the net height of the floor column, and 500mm.

Beam stirrup encryption range:

The encryption range starts from the column edge, the frame beam stirrup encryption length of the first-level seismic grade is 2 times the beam height, and the frame beam stirrup encryption length of the second, third and fourth seismic grade is the beam height of the times, and the cut should be greater than 500mm, if it is not greater than 500mm, the length of 500mm is encrypted.

In the frame and beams and columns with seismic requirements, all stirrups within the lap range of tension longitudinal tendon binding should be encrypted.

In the bottom of the foundation top surface and the embedded part above the column net height of the lower 1 3 should be encrypted, in addition to the bottom of the lower part, the bottom layer of the upper part and above the layer of the column net height of 1 6 and not less than 500mm of the range of stirrups to be encrypted. The stirrups of the frame column should be encrypted in the passage through each beam plate.

In the beam, the stirrup infill area is located at the place where the shear force is maximum, and it is calculated from the 50mm of the inner skin of the beam end support to the middle of the beam. Also divided into seismic strength grade one and two to four to determine the range of stirrup encryption area, divided into 2 times the beam height and times the beam height two values, the minimum shall not be less than 500mm, on the main beam at the intersection of the main and secondary beams, there are additional stirrups also need to be encrypted, the calculation of the unilateral encryption area is calculated from 50mm away from the side of the secondary beam, and the width of a secondary beam plus the height difference of the bottom skin of the primary and secondary beams. The encryption value is 8d of the stirrup diameter and is not more than 100mm.

When the embedded layer is 1 3 of the lower part of the column net height, the upper part is 1 6 + beam height range, and the lower part is also 1 6

First, the column longitudinal reinforcement 1, the longitudinal reinforcement of the middle layer of kz layer height - the height of the current layer extending out of the ground + the height of the previous layer extending out of the floor.

2. The number of stirrups in the middle layer of column stirrups 1 and kz n encryption areas Encryption area spacing + n + non-encryption area Non-encryption area spacing In 103G101-1, the provisions on the encryption area of column stirrups are as follows: 1) There are three encryption areas of the first layer of column stirrups, namely: the length of the lower stirrup encryption area is hn 3;max for the upper part; Encryption within the beam node; If the column is lashed and lapped, then the lap range needs to be encrypted at the same time. 2) The stirrups above the first layer are:

The length of the stirrup encryption area in the upper and lower parts is taken as max; Encryption within the beam node; If the column is lashed and lapped, then the lap range needs to be encrypted at the same time.

The stirrup encryption area of the beam is set up on page 85 of the national standard atlas 11G101-1: for seismic KL and WKL, if the seismic grade is level 1, then 2HB (beam section height) and 500;The seismic grade is two or four grades, then the beam cross-sectional height) and 500, non-seismic kl, wkl by the design to determine the range of the infill area.

The setting of stirrup encryption areas of columns and beams is described in detail in the national standard atlas 11G101-1: the setting of the column stirrups is shown on page 61 of the national standard atlas 11G101-1: the size of the long side of the column, hn (column net height) 6,500mm, whichever is the maximum.

Column stirrup precautions.

The thickness of the protective layer of the column reinforcement should meet the requirements of the specification, such as the outer skin of the main reinforcement is 25mm, and the cushion block should be tied to the outer skin of the column vertical reinforcement, and the spacing is generally 1000mm, (or the outer vertical reinforcement is stuck with a plastic card) to ensure that the thickness of the protective layer of the main reinforcement is accurate. At the same time, the rebar spacing frame can be used to ensure the correctness of the rebar position. When the cross-sectional size of the column changes, the column should be bent in the plate, and the bent size should meet the design requirements.

When the column reinforcement is capped to the structure, it is necessary to pay attention to the anchorage length of the column reinforcement on the outside of the side column, for details, please refer to the relevant practices in the "Detailed Drawing of Seismic Structure of Buildings" 03G329-1 (civil frame, frame-shear wall, shear wall partial frame support shear wall). At the same time, it is necessary to pay attention to the anchoring direction of the column reinforcement when the reinforcement is connected, so as to ensure that the column reinforcement is correctly anchored in the beam and the plate.

In the embedded part, then hn 3 (hn is the clear height of the column of the floor) in the floor part, then the three take the greater value, which three? 1. The size of the long side of the column; 2. hn If the bottom layer is a rigid ground, the top and bottom of the rigid ground need to be encrypted 500, if you want to know about the rigid ground, you can check this article: "What is a rigid ground?"

500mm above and below the rigid floor? 》

The specific method of distinguishing the reinforcement infill area and the non-encrypted area:

1. The encryption area has the encryption area of the beam and the encryption area of the column.

2. The encryption of the beam refers to the range of the beam span from the beam support 1 3.

3. The infill area of the column refers to the range of 1 3 column heights from the junction of the beam and column.

The reason why there is an infill area is because within the range of stirrup encryption, the shear force of the beam column is relatively large, and the stirrups need to be infilled. Stirrups plus spring reeds, generally for shear resistance, generally at both ends of the frame beam, the two ends of the column, when the main beam bears the support beam, the main beam is on both sides of the support beam bearing. Or set the shear resistance of the diagonal reinforcement.

The reinforcement is inlaid, usually where there is a relatively large load (e.g. a lightweight wall on the plate).