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STRCUTURAL BEHAVIOUR OF RC SLABS.docx - STRUCTURAL...

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STRUCTURALBEHAVIOUR OF RCSLABSCCB 411UNIVERSITY OF BOTSWANAFACULTY OF ENGINEERING AND TECHNOLOGYDEPARTMENT OF CIVIL ENGINEERINGGOFAONE BC MATEKENYA201601473
STRCUTURAL BEHAVIOUR OF RC SLABSA concrete slab is a common structural element of modern buildings, consisting of a flat, horizontalsurface made of cast concrete. Steel- reinforced slabs, typically between 100 and 500 mm thick, aremost often used to construct floors and ceilings, while thinnermud slabsmay be used for exteriorpaving [ CITATION GGa06 \l 1033 ], [ CITATION Che92 \l 1033 ].In many domestic and industrial buildings, a thick concrete slab supported on foundations or directlyon the subsoil, is used to construct the ground floor. These slabs are generally classified asground-bearingorsuspended. A slab is ground-bearing if it rests directly on the foundation, otherwise theslab is suspended. [ CITATION Gro17 \l 1033 ]For multi-storey buildings, there are several common slab designs:Beam and block, also referred to asrib and block, is mostly used in residential and industrialapplications. This slab type is made up of pre-stressed beams and hollow blocks and aretemporarily propped until set, typically after 21 days. Systems where props are usedincorporate lighter beams while the prop line allows for structural cross support. Proplesssystems used heavier inverted T beams to compensate for the exclusion of props. The lintelsand blocks are packed above load bearing walls under supervision and design by a structuralengineer. This system is extremely versatile in achieving complex designs and using unskilledlabour. It is cost efficient as well as easily understood by all contractors. The use ofpolystyrene blocks to replace concrete hollow blocks are used for lightweight insulated slabs.This keeps buildings warmer in winter and cooler in summer. From a structural viewpoint alighter slab assists by allowing load bearing walls and foundations taking less strain.A hollow core slab which is precast and installed on site with a crane. Precast concretepopularity is linked with low-seismic zones and more economical constructions because offast building assembly, lower self weight (less material), etc. Precast hollow-core elements isalso known as the most sustainable floor/roof system and has far smaller CO2 footprint thaneven CLT slabs.The precast concrete slab has tubular voids extending the full length of the slab, typicallywith a diameter equal to the 2/3-3/4 the thickness of the slab. This makes the slab muchlighter than a massive solid concrete floor slab of equal thickness or strength. The reducedweight also lowers material and transportation costs. The slabs are typically 120 cm widewith standard thicknesses normally between 15 cm and 50 cm.Reinforcing steel wireropeprovides bending resistance.

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Term
Summer
Professor
ADEWUYI
Tags
Concrete Institute, RC Slabs, Concrete Centre

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