Design And Structural Detailing Of Bar Bending Schedule Of A 2-Storey Building
Design And Structural Detailing Of Bar Bending Schedule Of A 2-Storey Building
Abstract
Bar Bending Schedule (which is also known as BBS) provides steel or reinforcement calculation of the drawings. BBS gives cutting length of reinforcement, type of bend in the reinforcement, Bend length of the reinforcement, total weight of the reinforcement or steel required at a particular site. Bar Bending Schedule is very important and is a little tough when drawings are complicated but it is a very important work on site where execution of certain work is to be performed.
Chapter One
1.0 Introduction
Bar bending is a process of cutting and bending reinforcement steel into shapes as suggested by the structural engineer for various structural elements like like Slab, Beam, Coloum, Footing etc.
Bar Bending Schedule is a list details of bent reinforcement bars used in any given structural concrete (RCC) element. The list contains bar mark, its diameter, length, shape and weight. Bar bending schedule is used by site engineers/home owners to estimate the quantities of various diameters of bars used in a construction, perform bar bending at site, and check the reinforcement work done by the contractor.
Bar Bending Schedule, commonly referred to as “BBS” is a comprehensive list that describes the location, mark, type, size, length and number, and bending details of each bar or fabric in a Reinforcement Drawing of a Structure.
This process of listing the location, type and size, number of and all other details is called “Scheduling”. In context of Reinforcement bars, it is called bar scheduling. In short, Bar Bending Schedule is a way of organizing rebars for each structural unit, giving detailed reinforcement requirements.
Preparation of highly detailed reinforcement drawing and bar bending schedule is an essential requirement in the construction field, all over the world except in India!! With this we can achieve a high level of quality control at site and will be advantageous in various aspects of construction.
Unlike the practice of doing reinforcement cutting and bending in a separate workshop, as in Nigeria, based on the bar bending schedule prepared by engineers in the design office, the practice in India has been doing reinforcement cutting and bending at the site only which is based on the bar bending schedule prepared at site by site engineers or supervisors.
In the present construction industry, the preparation of the bar bending schedule for the reinforcement work is by site engineers or the supervisors which is being done in India is becoming a bad practice. Due to lack of quality supervisors and unskilled labours in the site, our quality control in bar bending and laying is not up to the standard. Also proper cutting of bars is not done which results in cutting wastage .The fact is that the site engineers or the supervisors are not fully aware of all the design considerations that was made for the project, regarding the anchoring, curtailment and lapping of reinforcement bars and their positions, particularly in respect of ductile detailing for earthquake-resistant structures. So these schedules are to be prepared by the engineers in the design office only.
In the use of high grade concrete and steel, quality plays a major role. In order to prepare the bar bending schedule, the design office can have the information from site about the stock lists for bar diameters and their lengths available at the site. Fe 500 bars cannot be bend acutely as we bend the Fe 415 bars. Also there are rebending considerations to be followed. Proper scheduling, & bending with a mechanized system ensures this required quality level.
Let us focus on the detailed drawing to be done for reinforcement detailing (rebar) in reinforced cement concrete construction. Here rebars are drawn to 5mm accuracy as per the detailing rules in IS or British codes. The cost of a rebar shop drawing production can be in the range of Rs 3.5 to Rs 5 per square feet considering the quality standards maintained, whereas the advantages can be Rs 80- Rs 100/- as shown below. Thus 1 lakh square feet structure shop drawing preparation can save you about Rs 80 lakh. It is sad to know that every builder is loosing this amount in most of his projects.
This accuracy gives us, what you see is what you get format (WYS WYG), or in other words photolike drawings of the reinforcement layout. Every bar is marked with different number, at the same time providing the same number for the same type of bars. A schedule is prepared with all types of bars counted and sorted. So details of every bar can be seen in the schedule. This is called bar bending schedule system (BBS).
This schedule can be used to cut and bend the bars to the required shape in a cut and bend factory and also in a site. As the steel can be cut and can be brought to the site in a ready made form, Author would like to call it ready mix steel as like our favorite ready mix concrete.
1.1 Objective Of The Project
Bar Bending Schedule is a list details of bent reinforcement bars used in any given structural concrete (RCC) element. The list contains bar mark, its diameter, length, shape and weight. Bar bending schedule is used by site engineers/home owners to estimate the quantities of various diameters of bars used in a construction, perform bar bending at site, and check the reinforcement work done by the contractor. However, the objective of this work is to design and structural detailing of bar bending schedule of a 2-storey building.
1.2 Significance Of The Project
Bar bending schedule comprises of detailed reinforcement cutting and bending length. If bar bending schedule is utilized together with reinforcement detailed drawing, the construction quality gets better and cost and time is saved significantly for developing concrete construction works.
1.3 Advantages Of The Project
The following are the advantages of bar bending schedule in construction.
Provides better estimation of reinforcement steel to be used in each structural concrete member. Also you can compute the overall reinforcement required for the project.
Helps you in procurement of materials and better stock management. Reinforcement Steel is the costliest material out of all building materials accounting for almost 25% of the project cost. It is not always advisable to purchase the whole steel lot in one go (for house construction projects of more than 2 Floors). Steel requirement has to be divided in phases based on the construction. Bar bending schedule makes it easy for ordering the exact quantities of steel required for a specific phase of construction work.
Bar Bending Schedule provides exact estimate of the quantities required. So wastages at site can be avoided by careful monitoring of the contractor and using bar bending schedule along with that
Using Bar Bending Schedule, reinforcement can be cut and bend at factory and can be directly transported to site. This will not only reduce the wastage of reinforcement steel at site but also will reduce on labor costs, thus helping in reducing the overall cost of the project
Bar Bending Schedule helps site engineers and quality inspectors to check and approve the reinforcement thus aiding in better quality control
Billing can be prepared real fast and easy using Bar bending schedule. It is also easy for clients to approve those bills for payment
Bar bending schedule can help the team cut and bend the bars at a separate location while other activities are performed in parallel, thus saving time during construction
1.4 Application Of The Project
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 bending schedule helps the quantity surveyor to consolidate the number of bars required of each bar type.
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