What kind of rebars are these, and what is the classification of rebars?

g, n are both side reinforcement. One structural reinforcement, one torsional reinforcement. Both are subjected to force, but the force is not the same, so the length is not the same.

The lap and anchorage length of G structural reinforcement is generally 15d, and when N is subjected to torsional longitudinal reinforcement, the lap length is L or LLE (seismic resistance); Its anchorage length is L or LAE (seismic resistant). In the summary calculation, g n reinforcement and ordinary reinforcement are calculated together, and in the reinforcement summary table, it has been included in the beam reinforcement reinforcement, and g and n are both side reinforcement. One structural reinforcement, one torsional reinforcement.

Both are subjected to force, but the force is not the same, so the length is not the same. The lap and anchorage length of G structural reinforcement is generally 15d, and when N is subjected to torsional longitudinal reinforcement, the lap length is L or LLE (seismic resistance); Its anchorage length is L or LAE (seismic resistant). In the summary calculation, the g n reinforcement and the ordinary reinforcement are calculated together, and are included in the beam reinforcement in the reinforcement summary table.

There are 4 kinds of reinforcement in each section in the figure, namely: main reinforcement, structural reinforcement (torsion resistance), stirrup, and hook.

In the JL 1 section: 3 18 main reinforcements on the upper and lower sides, 2 12 reinforcements on the middle side are structural reinforcements (torsion ribs), stirrups with 8 spacing 100 200, and 8 spacing 400 are hooks.

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. The light round steel bar is actually the small round steel and disc round steel of ordinary low carbon steel. Deformed steel bars are ribbed steel bars with a surface, usually with 2 longitudinal ribs and transverse ribs evenly spaced along the length.

There are three types of transverse ribs: spiral, herringbone, and crescent. It is expressed in millimeters of nominal diameter. The nominal diameter of the deformed reinforcement is equivalent to the nominal diameter of the light round reinforcement with equal cross-section.

Steel bars are mainly subjected to tensile stresses in concrete. Due to the action of ribs, the deformed steel bar has a greater bonding capacity with concrete, so it can better withstand the action of external force. Steel bars are widely used in various building structures. Especially large, heavy, lightweight, thin-walled and high-rise building structures.

Related information

When the steel bar is processed and produced, the steel bar processing table and the design drawing should be reviewed, check whether there are errors and omissions in the blanking table, and check whether the requirements are met according to the material table for each type of steel bar.

If the reinforcement needs to be replaced in the construction, it is necessary to fully understand the design intent and the performance of the substitution material, strictly abide by the various provisions of the current reinforcement concrete design code, and not replace the low-strength reinforcement with high-strength reinforcement of the same area. The replacement of steel bars in important parts must be agreed by Party A and the design unit, and can only be replaced when there is a written notice.

Compression reinforcement, tensile reinforcement, erection reinforcement, distribution reinforcement, stirrups and other reinforcements configured in the reinforced concrete structure can be divided into the following types according to their functions:

1) Stress bar - the steel bar that bears the tensile and compressive stress.

2) Stirrups - bear a part of the diagonal tensile stress, and fix the position of the stress bars, mostly used in beams and columns.

3) Erection reinforcement - used to fix the position of the steel hoop in the beam to form the steel reinforcement skeleton in the beam.

4) Distribution rib - used in the roof panel, floor slab, and the slab to quarrel with the stress rib vertical arrangement, the service will bear the weight evenly to the stress rib, and fix the position of the stress rib, as well as resist the temperature deformation caused by thermal expansion and contraction.

5) Others - structural reinforcement configured due to component construction requirements or construction and installation needs. Such as waist tendons, embedded anchor bars, rings, etc.