Reinforcement marking:

1. The main reinforcement on the beam and the main reinforcement under the beam are expressed at the same time: 3φ 22, 3φ 20 means that the upper reinforcement is 3φ 22 and the lower reinforcement is 3φ 20.

Answer: Use semicolon ","3φ 22; 3Φ20。 Said the upper three φ 22 long steel bars and the lower three φ 20 long steel bars.

2. Representation method of steel bars on the upper part of the beam: (marked on the upper support of the beam)

(1)2φ20 refers to two φ20 steel bars, which are arranged in length and used for leg hoops.

Answer: It can't be marked in situ (marked at the bracket on the beam): it means it is used for double leg hoop. Unless marked in situ: marked on the lower part of the beam, such as 2φ 20.

10Φ@ 100(2)

According to your meaning, it should be marked as KL8(3)300×700.

10Φ@ 100/200(2) 2Φ20

⑵ 22+(4φ 12) means that 2φ22 is the total length, and 4 φ12 is used for the vertical reinforcement of six limb hoops.

Answer: Centralized marking: KL7(3)500× 1000.

10Φ@ 100/200(6)2Φ22+(4Φ 12)

(3) 6 φ 25 4/2 indicates that the upper row of steel bars is 4 φ 25 and the lower row is 2 φ 25.

Answer: In-situ marking: 6 φ 25 4/2.

(4)2φ22+2φ22 means that there is only one row of steel bars, two in the corner and two in the middle, which are evenly arranged.

Answer: In-situ marking: 2φ 22+2φ 22.

Excuse me, what is the difference between the main reinforcement on the beam and the main reinforcement under the beam and the main reinforcement on the beam?

A: How to answer you? You ask, only 1 beams with upper longitudinal reinforcement 3φ 22 and lower longitudinal reinforcement 3φ 22. Generally, the upper part is connected with long longitudinal bars (i.e. the main bars on the beam), and the longitudinal bars on the lower part of the beam are marked in situ under the beam (i.e. the main bars under the beam). What's the difference? The upper longitudinal bar is subjected to negative bending moment and the middle part is compressed. The longitudinal reinforcement at the lower part of the beam is mainly in tension. The upper non-penetrating reinforcement mainly bears negative bending moment (that is, when the "main reinforcement on the beam" has no bending ability to negative bending moment and the shearing ability is insufficient, the simply supported beam is often bent into ingot reinforcement together with the lower tensile reinforcement), and the upper and lower reinforcement of the beam is called stressed reinforcement except vertical reinforcement.

Different locations? Is the main reinforcement the same as penetration?

How can I answer you? What is the difference? Up and down position? Are you famous? Is the main reinforcement the same as penetration? What we usually call "main reinforcement" at the construction site refers to the lower longitudinal reinforcement. You call it "the main reinforcement on the beam". Is this main reinforcement equal to penetration? According to the concept of stress (except foundation beam), the upper reinforcement basically does not need "equal diameter" reinforcement penetration, and equal diameter reinforcement penetration is a waste! The steel bar at the lower part of the coupling beam can be made into ingot steel bar, and it does not even extend into the bearing. How to answer your question "Is the main reinforcement the same as penetration?"

3φ22, 3φ20 and 6φ25 4/2 all represent the upper half and the lower half. What is the difference?

Answer: This is different: 3φ 22; 3 φ 20 front is the upper (surface) long steel bar, followed by the lower (bottom) long steel bar. 6φ25 4/2 refers to the upper reinforcement of the bearing, but it is divided into two rows, from top to bottom. The first row is 4 Φ 25 (2 Φ 25 is long, 2 Φ 25 is a non-penetrating steel bar with a length of 1/3), and the second row is 2 Φ 25 (2 Φ 25 is a non-penetrating steel bar with a length of 1/4). In fact, you answered yourself, "(3) 6 φ 25 4/2 refers to the upper row of steel bars 4 φ 25 and the lower row 2 φ 25." .

Ask close questions

First of all, thank you very much, as shown in figure KL-3( 12), with the size of 250 * 400, 12, regardless of the rebar spacing of 0.8. Can you tell me if these two 20 pieces on the drawing are nails? The upper 3 pieces and 20 pieces, the lower 3 pieces 16 pieces are all long through beams, and the main reinforcement is put into the bracket. What do you mean, no stent? The beam runs all the way through the length, but the middle part extends into the bearing without penetrating? How to distinguish continuity from discontinuity?

As shown in figure KL-3( 12), the dimensions are 250 * 400 and 12, and the rebar spacing 8 is not mentioned. Can you tell me if these two 20 pieces on the drawing are nails?

A: KL-3( 12)

250×400

? 8@ 100/200(2)

2? 20

These two? 20 are two long rods (usually called angle steel) on the upper part of the beam of HRB335 or HRBF335.

Upper three, 20, lower three 16 are all full length?

Answer: The upper part of the left bearing is 3? 20 is called in-situ marking: it means 2? 20 is the total length of 1? 20 is a non-penetrating steel bar with a length of 65438+ 0/3 of the net length of long span; Lower longitudinal reinforcement 3? 16 overall length (but this does not guarantee the mid-span of 12).

How to express that the main reinforcement on the beam is put into the bearing? What do you mean, no stent?

Answer: When the longitudinal bars at the lower part of the beam are not fully extended into the bearing, write the number of longitudinal bars at the lower part of the beam bearing in brackets.

For example, the longitudinal reinforcement at the lower part of the beam is written as 6? 22 2(-2)/4, that is to say, the upper longitudinal reinforcement is 2? 22, and does not extend into the bracket; The next row of longitudinal bars is 4? 22, all extend into the bracket.

The longitudinal reinforcement at the lower part of the beam is written as 2? 22+ 3? 20(-3)/5? 22, indicating that the upper row of longitudinal bars is 2? 22 and 3? Twenty, three of them? 20 does not extend into the bracket; The next row of longitudinal bars is 5? 22, all extend into the bracket.