Category Archives: beam

CRANKED BAR ? SURE….

Dear Readers ,

This is another solved example for the BENT UP bars.

You must have read the earlier post on bent up bars.

Cranked Bars 

There was yet another post on Bent up bars ;

Bent up bars 

In the following article , you shall find a simplified formula for calculating the cutting length of the bent up bars.

24

25

26

Let us also revise some basic concepts about CURTAIL BARS and EOS bars.

Refer to the post :

RCC Beam :

27

28

35

30

31

36

RCC DRAWING….DIFFICULT TO READ ?

Dear Friends ,

Today we shall study the RCC drawing , find out the details of a Plinth beam and then work out the REBAR weight .

First , let us define the problem :

1

IMG_20160520_163543

32

7

6

8

9

10

11

12

13

14

This is BBS ..dear !

Friends ,

The Structure of a building is in Reinforced Cement Concrete.

The steel bars provided in the concrete make it strong to carry the tensile forces.

Thses bars are called as REINFORCEMENT.

The detailing of these bars [ Diameter ,spacing,covers, laps , dowel lengths, development lengths and shapes } are provided by RCC designer and are specified in the RCC drawing.

The extract of the steel reinforcement in the form of a table is known as Bar bending Schedule. The tabulation of the reinforcement details can be conviniently done using the MS Excel.

Professional contracting firms have got printed formats for BBS ready for the use of their staff. The BBS is prepared by the Qauntity Surveyors during estimation . The BBS is also prepared by the Site Engineers for controlling the quality of the Reinforcement Bars at site. The BBS is also an excellent tool for recording the measurements of the Reinforcement bars at site and the BBS can also be used to submit the Bills for the Reinf..bars.

This is a chart which basically gives the micro details about the various bars. This gives the dia, shape of bar , cutting length of the various bars in a RCC element such as Footing, column , beam ,slab etc.

The site engineer prepares the BBS based on the drawing and after due verification , hands it over to the reinforcement fitter.

By the use of BBS , the weight of the Re-bars can be easily calculated.

Let me explain you this popular tool with an example.

Imagine , there is a beam of the following cross section.

190
CROSS SECTION OF A RCC BEAM

The details of the reinforcement have been tabulated in the following table :

200

The cutting lengths of each bar is calculated and tabulated as follows :

210

But you can see that many details are missing from this abstract. Hence , a better tabulation , known as the BBS has been prepared which gives each details of the Re-bar in a crystal clear method :

220

The bar bending gives a very clear picture of the reinforcement.

IMG_20160111_115748