ARTICLES
RC DESIGN
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glossaryWhat is concrete cover?
Concrete cover is the distance between outermost reinforcement and concrete surface. A must-have component for every reinforced concrete structure due to durability, fire resistance and bonding performance. Concrete cover is determined by code requirements and exposure conditions.
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glossaryWhat is effective depth?
Effective depth is distance from outermost concrete from compression side to centroid of reinforcement in the tension side. Tension concrete is assumed cracked and neglected in calcaultion, so tensile reinforcement position is critical.
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glossaryWhat is neutral axis?
Neutral axis is an imaginary line in a reinforced concrete section where longitudinal strain is zero. It separates the compression and tension zones, and its position depends on loading, material properties, and section geometry.
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glossaryWhat is lever arm?
The lever arm is the distance between the centre of the compression force and the centre of the tension force acting on a section. It is a key parameter in moment capacity calculations. Understanding the strain distribution and stress–strain behaviour of concrete and steel is essential for determining the lever arm.
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glossaryWhat is K coefficient?
K is a unitless coefficent defined as M/(fck • b•d²). It represents the ratio of design moment to section capacity parameters (width, effective depth, and concrete strength). It helps quickly assess whether a section satisfies code requirements, including ductility and compression zone adequacy, and provides a convenient way to determine the lever arm ratio (z/d) and hence the required tension reinforcement.
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assumptionsWhat Are the Assumptions of Bending Design in Reinforced Concrete? (EC2)
Learn the key assumptions used in Eurocode 2 bending design for reinforced concrete beams and slabs, including strain distribution, stress blocks, force equilibrium, and ductility requirements.
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proofDerivation of relationship of x/d, z/d and K
Drivation of relationship of neutral axis x/d, z/d and K