STRUCTURAL
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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