How To Register With Bbs

What is meant by Bar Bending Schedule (BBS)

Bar Bending Schedule, normally referred to as "BBS" is a comprehensive listing that describes the location, mark, blazon, size, length and number, and angle details of each rebar or textile in a Reinforcement Drawing of a Structure.

This process of list the location, type and size, number of and all other details is called "Scheduling". In context of Reinforcement bars, information technology is chosen bar scheduling. In short, Bar Angle Schedule is a mode of organizing rebars for each structural unit, giving detailed reinforcement requirements.

bar-bending-schedule-for-rcc-beam-in-excel-sheet — bar-bending-schedule-for-rcc-beam-in-excel-canvass

General guidelines to exist followed in preparing Bbs:

The bars should be grouped together for each structural unit of measurement, e.g. beam, cavalcade, etc.
In a building structure, the confined should be listed floor by flooring
For cutting and bending purposes schedules should be provided every bit carve up A4 sheets and not every bit part of the detailed reinforcement drawings.
The form of bar and fabric schedule and the shapes of bar used should be in accordance with BS 8666.
It is preferable that bars should be listed in the schedule in numerical club.
Information technology is essential that the bar mark reference on the label attached to a packet of bars refers uniquely to a particular group or set up of bars of defined length, size, shape and type used on the job.
This is imperative as a bar mark reference can and then bespeak to a class of bar characteristics. Also, this helps steel fixers and laborers keep rail of the type and number of bars needed to consummate a sure work.

Bar Bending Schedule is used by the:

Detailer
person checking the drawing
contractor who orders the reinforcement
organization responsible for fabricating the reinforcement
steel fixer
clerk of works or other inspector
the quantity surveyor

Quantity surveyor is responsible for estimation and costing operations of a project. This kind of surveying demands a high level of precision. Bar Angle Schedule helps the quantity surveyor to consolidate the number of bars required of each bar type.

Engineers Reading Civil Engineering Drawings

This leads to an estimation of the quantity of steel, which translates to the cost requirements for steel work. Hence, Bulletin board system is used by the contractor who orders the reinforcements likewise. Unit of measurement cost of steel is charged by weight of steel purchased.

Clerk of works and other inspectors refer to the Bulletin board system to make sure that the reinforcement work in the site is in tandem with the design requirements every bit per drawings. It is used as a frame of reference past the steel fixers firsthand. They can easily make note of the number and kind of rebar needed for a structural unit of measurement.

In essence, Bar Angle Schedule subsumes all necessary information on reinforcements, used by professionals at various stages of the structure process, right from procurement to finish.

How to prepare a Bbs?

Necessary Columns

Bar number/Bar Marker Reference
Bar shape
Diameter
Spacing
Length of bar
Cut Length
Number of confined

Most of the information in a BBS tin be found in reinforcement drawings of the structural unit. Bar shape, diameter, length and spacing is directly entered in the schedule only by looking at the drawings, which will have detailed dimensioning.

beam-reinforcement-bar-marking-for-bbs — Beam reinforcement bar marking for BBS

Number of bars:

Suppose the spacing of stirrups is 150 c/c and the length along which they are placed is 6800 mm, we tin notice the number of bars past the formula beneath

[ Length / Spacing ] + 1 = number of bars

[ 6800 / 150 ] + one = 46.33

In this instance, we always circular upwards. Hence, nosotros require 47 stirrups.

Cutting Length:

We must call up than steel is ductile in nature and is subject to elongation. Hence, the length of a bar is increased when bends or hooks are introduced. Hence, certain deductions are needed to offset this increase in length.

Cutting Length = True Length of a bar – Deductions

For 45 degree
Cutting length = Total length – 1 10 Dia of bar x No. of bends

For 90 degree
Cutting length = Total length – 2 x Dia of bar x No. of bends

For stirrups:

xc caste claw:

Length of stirrup = (2A + 2B) + 20 ten dia

135 degree claw:

Length of stirrup = (2A + 2B) + 24 x dia

Example BBS Calculation

beam-reinforcement-bar-marking-for-bbs-cross-sectio — Beam reinforcement bar marker for BBS Crossection

Please refer to the PPT and Excel sail below. Pop-out(click on height right icon) the preview to download.