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Distinguish eight types of steel bars on construction sites

There are many types of rebar, usually according to chemical composition, production process, rolling shape, supply form, diameter size, and in the structure of the use classification, we mainly collate the use of classification below!
Number 1 Rebar
Refers to the arrangement in the lower part of the beam or plate to bear the tension of the part of steel and anti-shear bending reinforcement, hanging reinforcement, etc. How to distinguish between the stress and the distribution of reinforcement?
If it is a single plate, the reinforcement parallel to the direction of short span is the stress reinforcement, and the reinforcing bars parallel to long span are the frame reinforcement. If it is a two-way slab, then the long span, short span direction of the reinforcement is all the force reinforcement.
(2) To distinguish the diameter of rebar: the large diameter of the rebar is the stress rebar, and the small diameter rebars are the distribution rebars.
(3) to distinguish the layout: the positive bending moment reinforcement arranged in the lower reinforcement is the stress reinforcement, The vertical distribution of reinforcement above is the distributed reinforcement, negative moment reinforcement (such as cantilever plate) contrary, the reinforcement below is the distribution reinforcement, the above reinforcement is the stress reinforcement.
Number 2 Distribution reinforcement
The steel bar appears in the plate and is arranged on the upper part of the stressed steel bar and is perpendicular to the stressing steel bar. The function is to fix the position of the reinforcing steel bar and disperse the load on the plate to the reinforcing bar. At the same time, it can prevent the cracks in the direction perpendicular to the bearing steel bar because of the shrinkage of concrete and temperature change. It belongs to the structural steel bar. (To meet the structural requirements, for various factors which are not easy to calculate and not taken into account, the steel bars set are structural steel bars.) )
Number 3 Stirrups
Used to meet the shear strength of the oblique section, and the connection of the tension main steel bar and the compression zone concrete to make them work together, in addition, used to fixed the location of main steel bars so that the beam in a variety of steel bars to form a steel bar skeleton. A beam and column shear resistant configuration of ring (of course there are circular and rectangular) steel bar, is the mouth shape, the upper and lower reinforcement fixed, while shear resistance.
Number 4 Frame struts
It is the steel bar on the upper part of the beam. It only plays a structural role and has no real meaning. But at both ends of the girder, the upper frame bars resist the negative bending moment and cannot be missing. The erecting steel bars are arranged on both sides of the outer edge of the compression zone of the beam to fix the stirrups and form the steel bar skeleton. If the compression area is provided with longitudinal compression reinforcement, the vertical reinforcement may not be provided. The diameter of the erecting bar is related to the span of the beam. )
Number 5 Perforated bars
A steel bar that runs through the entire length of a member, such as a beam, without bending or breaking in the middle. When the steel bar is too long, it can be lapped or welded without changing the diameter.
What is the difference between erecting and penetrating tendons?
In the arrangement of steel bar, the erecting steel bar is 1 / 3 of this span, that is to say, there are left and right supporting steel bars in this span beam. The through-length rebar is a full-length arrangement. The bearing capacity of the beam can be improved to a certain extent by the compression of the frame bar.
Through bars are steel bars that run through the whole length of a member (such as a beam) without bending or breaking in the middle. When the bars are too long, they can be lapped or welded, but the diameter is not changed. The through-bar can be a force reinforcing bar or a frame reinforcing bar.
Frame reinforcement is also through, such as the specification in the upper beam on both sides of the frame reinforcement must be through, then frame reinforcement in support can also bear part of the negative moment.
If there is a general length of steel in the upper and lower beams, generally in the beam (compression area) and the smaller diameter of the frame reinforcement, in the beams are under the force reinforcement.
Number 6 Negative ribs
Is the negative moment reinforcement, the definition of bending moment is the lower tension is positive, and the beam plate position of the upper reinforcement in support position according to the force is generally the upper tension, that is to bear the negative bending moment, so called negative moment reinforced. The support has a negative reinforcement, is relatively speaking, generally should refer to the beam support site to offset the negative bending moment of steel, commonly known as Dan Dan reinforcement. The general structural components are divided into positive bending moment and negative bending moment. The reinforcing bar to resist negative bending moments is called negative reinforcement. Generally, the upper reinforcement of the fingerboard and beam, and the structural reinforcement of some upper configuration is also known as negative reinforcement. When the beam, the plate of the upper reinforced Tong Long, we are also accustomed to call the upper reinforcement, beam or board gluten is negative reinforcement).
Number 7 Tie bar
A steel bar reserved between two or more members that cannot be constructed simultaneously is a tie bar. It is a reinforcing steel bar which strengthens the connection between the frame infilled wall and the column, and improves the stability and anti-seismic ability of the infilled walls.
Number 8 Abdominal tendons
Generally located in the middle of both sides of the beam and get, is the central beam structure reinforcement, mainly because some beams are too high, the need to add a link in the central stirrup reinforcement (beam side of the longitudinal structure reinforcement actually known as waist reinforcement). At the height of 450mm, waist tendons should be set along both sides of the beam, so the number of not less than 2. The minimum diameter of the waist reinforcement is 10mm, the spacing should not be more than 200mm, and the area reinforcement ratio should be not less than 0.3%. The longitudinal structural reinforcement on both sides of the beam should also be provided with tie reinforcement. General civil construction with the waist rib diameter of 16mm and 18mm can be, with 8mm round reinforcement.