Spacing Of Reinforcement In RCC Members


Spacing of Reinforcement in reinforced concrete members:

Minimum Spacing between Bars in Tension

The minimum horizontal spacing between two parallel main bars shall be diameter of larger bar or maximum size of coarse aggregate plus 5 mm. However, where compaction is done by needle vibrator, the spacing may be further reduced to two-third of the nominal maximum size of the coarse aggregate.

The minimum vertical distance between two main bars shall be

(a) 15 mm,

(b) two-third of the nominal size of coarse aggregate, or

(c) maximum size of the bar or whichever is greater.

Maximum Spacing between Bars in Tension

Normally these spacing will be as mentioned below :

(a) For beams, these distances are 300 mm, 180 mm and 150 mm for grades of main reinforcement of Fe 250, Fe 415 and Fe 500, respectively.

(b) For slabs

(i) the maximum spacing between two parallel main reinforcing bars shall be 3dor 300 mm or whichever is less, and

(ii) the maximum spacing between two secondary parallel bars shall be 5dor 450 mm or whichever is less.


Fig: Spacing of reinforcement in beams


Reinforcement Requirement in Members

Beams

(a) Minimum tensile steel is given by the ratio (For Flanged Beams b= bw)

(b) Maximum Tensile Reinforcement in Beams shall not exceed 0.04 bD.

(c) Maximum area of compression reinforcement shall not exceed 0.04 bD.

(d) Beam having depth exceeding 750 mm, side face reinforcement of 0.1% of webarea shall be provided. This reinforcement shall be equally distributed on two faces at a spacing not exceeding 300 or web thickness or whichever is less.

Comments

  1. Vasantha30 December 2020 at 04:42

    Nice Blog! Thanks for sharing this blog. Ksteel is the Top dealer of reinforcement bars in Bangalore. Find your choice full reinforcement bars, sail tmt barcrs grade tmt, at best steel rod prices.

    ReplyDelete
  2. latha11 February 2022 at 14:18

    Good blog. Very easy to read. MS chequered plate

    ReplyDelete
  3. jazz11 February 2023 at 13:10

    we alwasy have to use Industriemaschinen for RCC purpose

    ReplyDelete
  4. mark Steve15 April 2023 at 13:59

    omg spacing reinforcement i heard that first time is it related to 5-Achs Bearbeitungszentrum

    ReplyDelete

Post a Comment

Popular posts from this blog

How To Calculate or Estimate Long-span Aluminium Roofing Sheets.

Image
Aluminium roofing sheets, they come in rolls of average of 600mm to 1300mm depends on the manufacture and specifications. As stated in previous articles, the aluminium sheets comes in rolls at the factory just like toilet rolls but with different widths and thickness based on specifications. Calculating the roof required could be done by calculating the surface area in square meters of the area covered by the aluminium and for some companies it could be calculated in meter lengths ,knowing the width which is 600mm above as constant. For a simple gable roof as shown in pic 1 with length of 25.2m. First you must know the height of roof from the section. For this sample we are taken the eight to be 3meters (10 feet)to know the length of leaf “x” or “y” Remember the pythagoras theorem x2=32 +6.12 x=6.8m Hence the area of roof is (6.8 i.e x)+6.8 i.e y) multiply by length 25.2m=342.72m2 If the width of the roof comes in 600mm or 0.6m, the length of the roof ...
Read more

Post Tension Slab – Advantages and Disadvantages of Post Tension Slab

Image
Post Tension Slab Although concrete is a strong material for construction, it is not resistant to breakdown especially where longer concrete slabs are required like in a bridge or a length of a beam. For this, the concrete slab is tensioned with a process called pre-stressing and the slab of concrete which comes out after this process is known as post tension slab. This slab is much stronger as well as more durable than the normal concrete slabs. In today’s world, where the modern engineering is finding new ways to build longer, more efficient and stronger structures, post tension slab becomes one of their chief requirements. There are many advantages and disadvantages of post tensioned slabs which we will discuss in this post. Advantages of Post Tension Slab Post tension slabs are advantageous in many ways. Some of the major benefits of post tension slabs are as follows. 1. Reduced cost: Post tension slabs are excellent ways to construct stronger structures at an affordable...
Read more

How to install POP (plaster of paris) ceilling

Image
Plaster of Paris is regarded as any type of plaster containing calcined gypsum (calcium sulfate dihydrate), sand and water. When these ingredients are combined, they result in the formation of a tough, dry product; however, plaster of Paris can be sanded to achieve a variety of looks. By following some basic guidelines, you can use plaster of Paris to mend cracks, fix dents,for ceiling, in walls and even to create artworks. However in this case our focus is on ceiling. POP popularly called plaster of Paris is used for a lot of purposes because it can easily be formed to any shape and it hardens quickly and is easy to operate. To do a pop ceiling in your home, getting it done is in two ways, you can buy the materials yourself which include pop cement , yarn(sponge-like material) etc then pay the installer based on per square meter of area of coverage, or you can give it out totally as a contract. But these are the basic steps in getting pop ceiling cast-on-site done. Get cemen...
Read more