24. Terminology of Construction

1) Tie HoopHorizontally placed bar in order to prevent reinforcement from buckling and maintain

spacing of bars.

2) Main Bar① Reinforcement that take charge of tensile and compressive load in beams and

pillars, etc.

② In general, thick bars are used for tensile load and thin bars are for shear strength.

This thick bar for tensile load is considered as main bar, however, all the bars for

reinforcement are termed 'main bar'

3) Double Reinforcement BarTwo strips of bar are arranged in the retaining wall in both longitudinal and transverse

directions, and this bi-strip reinforcement is "double reinforcement".

4) Single Reinforcement BarOpposite to double reinforcement.

Only one strip of bar is arranged in the retaining walls.

5) Assist(Support) BarExtra bars to be placed to maintain the shapes and locations of main reinforcement.

6) Top(Upper part) BarBars at the top span of beams or slabs.

7) Bottom(Lower part) BarBars at the bottom span of beams or slabs

8) Hunch Hunch is, in general, placed onto the pillars in order to strengthen the junction of a

beam and a pillar, hunch is also placed in walls to fortify the junction of the floor and

walls.

9) Shear Reinforcement Bar(Vertical direction bar)Reinforcement for shear strength, such as stirrup and tie hoop.

10) StirrupReinforcement that encloses main bars to help them arrest mixed concrete and

maintain their shapes and spacing.

Both ends should be hooked more than 135°.

11) Bearing WallWalls that sustain both vertical force and horizontal force.

Reinforcement wall takes the most exterior force against the walls.

12) Reinforcement BarHoops in pillars or stirrups in beams to sustain horizontal force and shear strength to

prevent the crack of building or to maintain cover depth of the concrete.

※※ Shear strength?

Shear strength is strength that restrains shear of members by external forces.

Shear strength increases if it approaches to the end of a beam.

13) Distribution BarBars that arrange the main bars and distributes loads uniformly to the main bar.

14) Bent Bar Bars that are placed in beams in order to effectively sustain tensile load at the end

span of a beam.

These days, cut-bars are often used instead of bent bars.

15) Deformed BarBars that have threads on the surface to help strong bonds between bars and concrete.

16) Tension BarBars that sustain tensile loads.

17) Compression BarBars that sustain compression loads.

18) High Strength(tensile) Bar HD is a high strength bar that has more than 3,500kg/cm2 of yield strength.

HD contains Si, Mn and Ni in it. (also called "high bar" in brief)

19) Symbol of Material

20) Application of @ Indicates distance between bars in stirrup, hoop and other reinforcement.

symbol

material

foundation

pillar wallindication

regular

G

small

B

GF C W

foundation

FG, FB

cantilever

CB

regular

S

anti-compression

FS

cantilever

CS

beam slab