Concrete Floors Structural Design by Hand Calculations

Define design loads for floor slabs, based on structural mechanics, confirm with architect, account for self weight, dead and live loads, and live-load reductions on beams and flat slabs.

Learn core analysis equations for concrete floors, including simply supported and continuous beams, bending moments, shear forces, and deflection, plus practical notes on redistribution, construction joints, and live-load patterns.

Demonstrates a design example for a one way beam and slab using a 150 thick slab, free body and bending moment analysis, and compares Australian, Eurocode, and American load combinations.

Demonstrate rc flat plate design with design strips and column strips on an eight point four meter span, applying live load reduction and column-strip load distribution.

Explore bending design in reinforced concrete, compare singly and doubly reinforced sections, explain concrete’s plastic behavior and steel ductility, and show minimum strength and design moment calculations using section modulus.

Apply bending design calculations to a practical example, computing design moments, reinforcement, and effective depth for a one-way slab, and compare capacities under Australian, Eurocode, and AICI standards.

Designs a flat-plate bending scenario, identifies end-span hogging and sagging moments as critical, and evaluates efficient reinforcement strategies—from selective 16–300 and 24–300 bars to a blanket approach for sustainability.

Explore reinforced concrete shear design with the modified compression field theory, replacing traditional truss models, and learn to calculate concrete shear capacity and required reinforcement.

Apply the simplified concrete shear capacity method to a slab example, determine effective depth and critical shear, compare design shear with capacity, and conclude no shear reinforcement is needed.

Master two-way punching shear design for flat slabs by using the shear parameter and average depth, and improve capacity through prestress, concrete grade, column shape, stud anchors, or thicker slabs.

this lecture demonstrates punching shear checks for a flat plate, comparing Australian and American codes, computing the punching perimeter and design load, and suggests increasing column size.

Examine vibration and deflection for concrete floors in serviceability design. Mass dampens motion; thin or prestressed floors may require analysis if deflection exceeds 1–2 mm under one kilometre live load.

Explore serviceability checks for slabs and floors, focusing on deflection criteria, span-to-deflection ratios, and how cracking, creep, and long-term stiffness shape final deflections.

Use span-to-depth ratios as a preliminary check for slab thickness to control deflections. Refined deflection calculations with finite element methods account for cracking, tension stiffening, shrinkage, creep, and load history.

Follow how long-term deflections arise from construction loading, creep, and shrinkage, then balance sustained versus remaining live loads to control final and incremental deflections.

Demonstrates two deflection checks by calculating reinforcement ratio, k factors, effective width, and long-term loads. Compares European and American standards and highlights practical hand calculations for slabs.

Explains crack control in concrete, covering flexure cracking and temperature-shrinkage cracking. Prescribes 300 mm slab bar spacing and 300 mm centers for beams (or 2x slab depth) to limit cracks.

Learn crack control in concrete slabs: use 75% of the primary-direction reinforcement for one-way and two-way slabs, with exposure-based limits 0.175%–0.6%, and spacing rules for exterior slabs.

analyze a one-way slab design example to determine minimum reinforcement, crack control, and thermal and shrinkage provisions across international codes, with 300 mm bar spacing and bottom-layer placements.

Explore how concrete durability protects reinforcement by controlling abrasion, freezing and thawing, cement content and air voids, with adequate cover to prevent rusting and carbonation under sea-air chloride exposure.

Examine how exposure classification drives durability design, determining concrete grade, cover, and curing from ground to coastal and industrial settings, considering carbonation and chloride risk with climate and shrinkage.

Compare euro, australian, and american codes for an indoor one-way slab durability design, adjust cover from 20 to 25 mil, meet 0.7 water-cement ratio and concrete grade with spreadsheet help.

Analyze fire design for concrete floors by examining fire compartments and ensure structural adequacy, integrity, and insulation to limit fire spread and support evacuation.

Analyze fire design for concrete floors: one-way slab and flat slab, checking thickness, cover, and access distance against 90- and 120-minute fire ratings using Australian and American codes.

Detail reinforcement for a one-way slab by clearly communicating bottom and top bars, extensions, laps, and joints to on-site builders, with bottom bars extending 12 times bar size from supports.