Why We Provide Crank bar in Slab & Beam | What is Bent Up Bar | What is Cranked Bar

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If you are a technical person, you must have the knowledge about Why We Provide Crancked bar in Beam & Slab | What is Bent Up Bar | What is Cracked Bar
1. Cranked Bar
Cranked bars are reinforcement bars (rebars) that are bent or cranked at certain angles. They are commonly used in beam and slab design to address specific structural needs.
Purpose in Beams & Slabs:
Shear Strength: In beams, cranked bars help resist shear forces. They provide additional reinforcement in regions of high shear stress, such as near supports or in the vicinity of concentrated loads.
Moment Redistribution: In slabs, cranked bars are often used to enhance the distribution of bending moments, particularly in areas where the bending moments change direction.
Application:
Cranked bars are typically placed in regions of the beam or slab where the bending moment changes direction or where the shear forces are significant. The cranking allows the bars to follow the line of the principal stresses, which improves the overall strength and efficiency of the structure.
2. Bent Up Bar
Bent up bars are reinforcement bars that are bent upwards from their horizontal position. This bending is often done at specific points along the length of the beam or slab.
Purpose in Beams & Slabs:
Shear Reinforcement: Bent-up bars are used to improve the shear capacity of a beam. By angling the bars, they help resist the shear forces more effectively.
Support in Tension Zones: In areas where the tensile forces are high, such as the top of a simply supported beam near the support, bent-up bars provide additional support.
Application:
Bent-up bars are typically placed in the lower part of a beam, where shear forces are highest. The angle and position of the bends are designed according to the expected shear and moment conditions.
3. Cracked Bar
The term cracked bar is less standardized but generally refers to a reinforcing bar that has been placed in a region of concrete where cracks are anticipated or have already appeared.
Purpose:
Stress Redistribution: Cracked bars might be used to redistribute stresses in areas where cracks are expected due to high tension or bending.
Structural Integrity: In some designs, bars are placed to maintain structural integrity and prevent further cracking or failure.
Application:
In practice, engineers design reinforcements to minimize cracking by calculating appropriate bar sizes, spacing, and placement. Cracked bars are more of a consideration for maintenance and monitoring rather than a design element, as ongoing inspections might reveal issues with the bars and concrete.
Summary
Cranked Bars: Bent at angles to improve shear resistance and moment distribution.
Bent Up Bars: Reinforcement bars bent upwards to enhance shear strength and support in tension zones.
Cracked Bars: Reinforcement bars placed in or expected to be in areas with cracking, focusing on maintaining structural integrity.
Understanding and using these types of reinforcement effectively helps in designing concrete structures that are both strong and durable.
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[@tariqkhan3987]

Nice and Good

[@shahzaibali-li4mb]

D dia of bar ha?
Ya depth of beam ha?
Dia mm me put krna ha ya star me?

[@CivilEngineers99]

@shahzaibali-li4mb No Dear D= Depth of Beam- clear cover top -Clear cover bottom

[@CivilEngineers99]

@shahzaibali-li4mb Also watch me Video on Slab Reinforcement you will understand easily...How To Calculate Steel Quantity In Two Way Slab | How To Calculate Quantity Of Steel In Slab
Video link
th-cam.com/video/yFhsPczW8Eg/w-d-xo.html