And the only way to have no stiffness is to form a zero capacity plastic hinge in the column. Concrete deck slabs can be constructed with castinplace or precast methods, and typically include mild steel reinforcement in the longitudinal and transverse directions. Typical layout of load bearing building design data. Pretty easy, we used to have the same stair case in my home in india. The basic design precepts employed in cantilever walls include considerations of dead man tiebacks, taking active pressures to the bottom of the wall and considering any reductions in passive resistance for inclined slopes. Apr 4, 2012 this is a typical reinforced concrete cantilever slab reinforcement detail with a constant slab width. Cantilever slab supported on a reinforced concrete beam with top and bottom reinforcement as well as middle torsion reinforcement. This design should always be used unless approval to use a thinner deck is obtained from the state bridge engineer. There are several cantilever beams spaced at 2m centres with a reinforced concrete slab spanning across the beams. This is a typical reinforced concrete cantilever slab reinforcement detail with a constant slab width for the cantilever and the adjucent slab. A decrease in moments from solid to voided slabs is about 11%, 7% and 5. Engineering books excel sheets design of cantilever slab spreadsheet. Design of cantilever slab civil engineering youtube. Another example of tent structure german pavilion, expo 67, montreal, canada.
Structural design of cantilever slabs solved example structville. Chapter 7 lfd design criteria new and reconstruction. A six storey building for a commercial complex has plan dimensions as shown in figure 1. Solved example a cantilever slab 200 mm thick is 1. Pdf design envelopes for cantilever slabs to resist blast loads. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. For designs, quasistatic and dynamic regimes are combined to form one regime and impulsive. File format dwg, dxf, pdf product type digital download index reinforced.
One way slab design procedure with example design of one. Reinforced concrete constant width cantilever slab detail youtube. A 2 2area 2 a c 2 2 posttensioned concrete design table 11 list of symbols used in the aci 31808 code cp area enclosed by the outside perimeter of the section, in a g gross area of concrete, in a 2 l total area of longitudinal reinforcement to resist torsion, in a o area enclosed by the shear flow path, sqin a oh area enclosed by the centerline of the outermost closed. Design envelopes for cantilever slabs were developed using kingery and bulmashs 1984 empirical method for estimations of blast parameters and the procedures described by cormie d et al. In this article the discontinuity layout optimisation dlo procedure which has been used to automate the yieldline method is briefly described and then applied to various example problems. Design of cantilever slab spreadsheet download link more from my sitevoided twoway slab design based on aci 31814 spreadsheetdeck toggle navigation. Introduction reinforced concrete slabs are a feature of many modern buildings and bridges. Crosssections can include a combination of rectangular, i, t and lsections, and spans can have constant or tapered sections. Cantilever slab design part1 by parag kamlakar pal. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. Pdf cantilever slab design ramjan shehzaad academia. How to design a cantilevered, slabless, waistless rcc.
Design envelopes for cantilever slabs were developed using kingery and. Using aashto lrfd bridge design specifications 4th ed. It was thrill walking on it as each step would swing little under weight. The following worked example is for a freestanding cantilever. Appendix a examples colorado department of transportation. Introduction 92 diaphragm design example 93 typical fastener layout 94 1. Design of cantilever slab spreadsheet engineering books. Analysis and design of cantilever slab beam structure. When no seismic loads are applied, the soil pressures have a slight trapezoidal form and the spread footing is subjected.
General overview of posttensioned concrete design instructor. Usually the cantilever wall stem is of concrete block construction rising from an insitu concrete foundation. As with any design function, the designer must ultimately understand and approve the loads for a given project as well as the overall design. Purpose of this exercise is to calculate the stresses in a reinforced concrete cantilever beam due to its own weight.
They are projections from wall face of lintel beams or floor slabs. Chapter 3 design loads for residential buildings methods for determining design loads are complete yet tailored to typical residential conditions. A detailed explanation will be given of the checksto be carried out, the aspects to be considered in the design and the construction procedures and sequences of a posttensioned slab. The construction and design of concrete slabs on grade. Hello in this video cantilever slab is design as per is. Reinforced concrete continuous beam analysis and design. This guide covers the design and construction of composite slabs and beams, and. For cantilever, the effective length of a cantilever shall be taken. For cantilever, the effective length of a cantilever shall be taken as 1, its length to the face of the support plus half the effective depth, note in. Usually balcony slabs are cantilever slab and hence a provision for wall load at free end is included so that the spread sheet is useful for practical purposes. Introduction concrete slabs on grade are a very common type of concrete construction.
In this post, we are going to show how we can analyse and design cantilever slabs subjected to floor load and block work load. Design of slabs today, we shall start design of slabs. When simple spans of an existing bridge are being replaced, consideration should be given to replacement with continuous beams and continuous for live load superstructure. Cantilever concrete retaining walls are commonly used for residential purposes, often as integral basement walls. Pdf blast resistant structural designs are becoming essential because of the. The service live load is 100 psf and 4000 psi concrete is specified for use with steel with a yield stress equal to 60000 psi. Before we start the design of slabs, let us see what our words says related to your effective span. Breadth of slab is already fixed b mm shear stress are usually low in a slab except when there are. Oneway and twoway slabs oneway slabs transfer the imposed. Any wall supporting the cantilever slab, except that for very small span. Slab design much simpler than beam design concrete slabs behave primarily as flexural members and design is similar to that of beams, although in general much simpler because. Design of cantilever slab spreadsheet download link. Asce, secb course content slab on grades construction.
Worked example 2 design of concrete cantilever retaining. Reinforced concrete design 1 design of slab examples. Cantilevered floor slabs rcc slab design is a free app for designing one way. Concrete volumes and slab design data 81 concrete slabs on form deck 82 83 ufs, uf1x, ufx, uf2x maximum span and cantilever tables 84. Special issues in this type of problem are the treatment of the structure as a composite and the presence of a compressiononly material the concrete.
Furthermore, the fact that weathering may lead to the early degradation of. Slabs are usually used in floor and roof construction. Analysis and design of cantilever slab free download as word doc. Even while designing they are considered as one slabs with cantilever fixed or continuous at supports. Pdf design envelopes for cantilever slabs to resist. So, we have a few more lecturers, so today we shall. Design and detailing of reinforced concrete beams and slabs. Any fool can design a example factor of safety gravity retaining walls figure 7. A copy of the tables is provided in the appendix and also. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Deflection generally governs design for cantilever walls more than 18 feet high. To make the slab design independent of the type of rail, we will place the wheel load 1 from the nominal face of the rail 1ft from the edge of the slab. This spread sheets is useful for design of cantilever slab as per is 456.
Reinforced concrete constant width cantilever slab detail. The construction and design of concrete slabs on grade d. The decking should not cantilever beyond a support more than 600 mm or. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Slab design example 03 design of cantilever slab span of slab 1. In the design and analysis of reinforced concrete members, the mechanics of members consisting of two materials. Comprehensive design example for prestressed concrete. Design a typical reinforced concrete cantilever balcony beam and slab system for a highrise apartment building to satisfy ultimate limit state requirements from the following description. The continuous beam along grid 3 is selected to demonstrate the analysis and design of continuous tbeams structural analysis, flexural design, shear design, deflection checks and the results of hand calculations are then compared with numerical analysis results obtained from the spbeam engineering software program. Use i wsd, ii usd to design the twoway slab shown below, carrying floor finish 30 psf, random wall 50 psf and live load 60 psf given.
Design of concrete structures sessional department of civil engineering. Generally, reinforced concrete deck slabs are the most often used type of deck for steel bridges. Inclined pitched roof concrete slab reinforcement example. Download as docx, pdf, txt or read online from scribd. This design example was not intended to follow the design and detailing practices of any particular agency.
Reinforced concrete slab bridges design considerations haunched slabs straight haunches preferred in lieu of parabolic depth at pier should be 2 2. The execution of the design will be explained with reference to an example. Analysis and design of cantilever slab d47ex7jzmjn2 idocpub. Sci p300 composite slabs and beams using steel decking best. Run a beam diagonally along a side and then design a step as cantilever and anchor. The result is this publication, the steel deck institute design manual for composite decks, form decks and roof decks, a. Example design a cantilever projecting out from a room slab extending 1. They typically have put out one for each edition of aci 318and its got a lot of worked examples and is.
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