# Introduction of BBS of One Way Slab and Estimation of Steel Quantity A. INTRODUCTION

BBS is an acronym that stands for behavior-based safety. It is a process that helps identify unsafe behaviors and correct them. It is a proactive approach to safety that is based on the premise that most accidents are caused by human error.

Behavior-based safety is most effective when it is part of a larger safety program that includes other elements such as safety training, hazard identification and abatement, and incident investigation. When used in conjunction with these other safety activities, behavior-based safety can help reduce the frequency and severity of accidents.

B. ESTIMATION OF STEEL QUANTITY

The safety performance of abehavior-based safety program can be measured by

## BBS ( Bar Bending Schedule) of One Way Slab

• One way slab is a type of concrete slab that is supported by only two sides
• It is most commonly used in residential and office buildings
• The two sides are typically oriented perpendicular to each other, and the slab is supported by columns or walls on each side
• One way slab is supported by beams on one side only.

There are many different types of one way slab systems, but the most common is the two-span system

• This system consists of two beams that span the length of the slab and support the slab at its ends
• The beams are typically spaced about four feet apart, and the slab is about six inches thick.

The two-span system is the most efficient way to support a one way slab

• It is less expensive and easier to install than other systems
• It is also the most commonly used system in the United States.

## Weight Calculation of Main Bar of BBS of One Way Slab

• The weight of the main bar of the BBS of one way slab can be calculated by using the following formula:

W = L * (D-d) * ρ

W = weight of the main bar (kg)

L = length of the main bar (m)

D = diameter of the main bar (mm)

d = diameter of the longitudinal reinforcement (mm)

ρ = density of the main bar material (kg/m^3)

## Calculate Cutting Length of Single Piece of Distribution Bar of BBS of One Way Slab

• The cutting length of single piece of distribution bar of BBS of one way slab can be calculated by using the following formula:

Cutting length (L) = (span of slab (S)) / (number of bars required (N))

where,

S = span of the slab (in mm)
N = number of bars required

For example,

If the span of the slab is 6 m and the number of bars required is 20, then

Cutting length (L) = (6 m) / (20)

= 300 mm

## Calculate Total Requirement of Reinforcement for the BBS of One Way Slab

• Assuming we are using standard stirrups spaced at 12 inches, and 2% reinforcement, the calculation for the total reinforcement required for the BBS of a one way slab would be:

Total length of stirrups = (12 in/ft x 12 ft) + (12 in/ft x 8 ft) = 288 in + 96 in = 384 in

Total number of stirrups = (288 in/12 in) + (96 in/12 in) = 24 stirrups + 8 stirrups = 32 stirrups

Total length of reinforcement = (32 stirrups x 2 ft) + (24 stirrups x 3 ft) = 64 ft + 72 ft = 136 ft

## Conclusion

One Way Slab:

A one-way slab is a slab that bends in only one direction. The steel quantity of a one-way slab can be estimated by its span, width, thickness, and the load it needs to support. The load is typically estimated by the dead load, live load, and wind load. The steel quantity is then multiplied by the weight of the steel.