Basic knowledge of reinforcement

reinforcement

1. Stress reinforcement: refers to the part of the reinforcement arranged in the lower part of the beam or plate, bearing the tension and shear bending bars, hanging bars, etc.

2. Distributed reinforcement: appears in the plate, arranged in the upper part of the stress reinforcement, and the stress reinforcement vertical.

3. Stirrup: It is used to meet the shear strength of the oblique section, and connects the main steel bar under tension and the concrete in the compression zone to make it work together. In addition, the steel bars used to fix the position of the main steel bars so that the various steel bars in the beam constitute the steel skeleton.

4. Bracket reinforcement: is the upper part of the beam reinforcement, only plays a structural role, no substantial significance, but at both ends of the beam is the upper bracket reinforcement resistance to negative bending moment, can not be missing. The vertical reinforcement is the non-stress reinforcement required by the structure, which is generally arranged in the compression zone of the beam and has a small diameter. When the upper part of the beam support is arranged with negative moment reinforcement, the frame reinforcement can only be arranged in the span part of the beam, and the two ends of the negative moment reinforcement lap or welding. The lap joint must meet the requirements of the lap length and be bound.

5. Through bar: refers to the steel bar that runs through the entire length of a member (such as a beam), neither bending nor breaking in the middle, and can be effectively connected when the steel bar is too long, but does not change the diameter. It's usually 9 meters or 12 meters per section.

6. Negative reinforcement: negative moment reinforcement. The definition of bending moment is that the lower tension is positive, and the upper steel bar at the position of the beam and plate is stressed at the position of the upper tension, that is, to bear negative bending moment.

7. Waist tendons: in the beam height 450mm, should be set along the beam height on both sides of the waist tendons, so in number will not be less than 2. G/N: structural reinforcement, torsion reinforcement.

8. Bending reinforcement: refers to the lower (or upper) longitudinal tensile reinforcement of concrete structural members, according to the specified position and Angle bending to the upper (or lower) member, and meet the anchorage requirements of the reinforcement, is made of longitudinal stress reinforcement bending. The bending bar can bear the same positive bending moment near the mid-span as the longitudinal tension bar. After bending near the support, the bending section can bear the principal tensile stress produced by bending moment and shear force. The curved horizontal section can sometimes bear the negative bending moment at the support.