Addtional slab costs betweeen soils h and p somersoft. When approaching a class p or difficult site, engineers must find innovative, collaborative design solutions that mitigate risks to residential projects. A mat foundation is a large concrete slab that supports column or line loads that. Here, we have tried to gather various reading materials available in the web about flat slab floor system in one place. Sorry i was wrong, the contract says mclass waffle pod slab and the promotion list says upgrade to hclass slab if required, sorry for the mistake. Dhang, department of civil engineering, iit kharagpur. Class p concrete shall contain 70 percent to 80 percent portland cement and 20. The example presented here is for twoway posttensioned design.
Features of the geometry and details of loads applicable to the floor slab covered by this report are included herein. P just means there is a problem with the soil and an engineer will need to design your slab. One of the most significant characteristics of this type of valves is its. Design criteria there are three criteria which must be considered for the design of a conventional one way slab system. Framing dead load selfweight superrimposed dead load 25 psf partitions, me, misc.
Besides being a medic, he loves blogging, and he always strives hard to share the highquality content with others. Part two is an example intensive course, with key concepts introduced along. Department of mechanics, materials and structures english. Accordingly, main reinforcement is required in the two directions. This manual p rescribes the criteria for the design of concrete floor slabs on grade in buildings for heavy loads and is applicable to all elements responsible for military construction. Following are the rcc slab design and detailing guidelines. Sum fatigue and erosion damage factors over all of the. Reinforced concrete design 1 design of slab examples and. Extra soil that has been placed on your block that. C 5 is the slope correction coefficient co is the consolidation correction coefficient as an example. Site class e, depth 30 ft site class c, depth 10 ft site class c, depth 30 ft 0. Reinforced concrete design 1 design of slab examples. Construction requirements the minimal thickness of the concrete layer above the profiled sheet should be.
Concrete slab, a very common and important structural element, are constructed to provide flat, useful surfaces. The attached excerpted resource materials have been made. A civil engineer must know all the aspects regarding the flat floor system. On the otherhand there could be some real problems that are costly. This manual supersedes tm 580912afm 883, chapter 15, dated 1 april 1977. In accordance with as28702011 residential slabs and footings construction a site classification of class p is applicable to this site due to fill. Posttensioned oneway slab pennsylvania state university. One method is to ignore the weight of the solid part of the slab in the analysis of the ribbed slab and the weight of the solid area added to the supporting beam. It is a horizontal structural component, with top and bottom surfaces parallel or near so. The construction and design of concrete slabs on grade d. Design and construction of concrete slabs on grade, aci. Structural steel composite slab 1 of 7 rev design project.
Structural details of slab culverts 3 for spans less than 3. Introduction concrete slabs on grade are a very common type of concrete construction. The slab has to carry a distributed permanent action of 1. Laboratory trial mix for class p concrete must produce an average 28 day flexural strength of at least 650 psi.
Usually the soil test has further clues that describe the problem with the soil. In the absence of the fill material, the designing engineer should recognise that the natural soils encountered on this site. Bending will take place in the two directions in a dishlike form. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Design of reinforced concrete 10th edition pdf free download.
Analysis of two way ribbed and waffle slabs with hidden beams. Tm 580912 concrete floor slabs on grade subjected to. Design of slab examples and tutorials by sharifah maszura syed mohsin example 1. Lecture series on design of reinforced concrete structures by prof. What is a soil test and how is it used to design house. Fundamentals of posttensioned concrete design for buildings. The depth of a concrete slab floor is very small compared to its span.
Aci 360, design of slabsongrade, refers to this as a type b slab. Building systems designed and constructed in accordance with this standard on a normal. The construction and design of concrete slabs on grade. The slab is propped at the centre during construction stage. Basic design criteria concentrically loaded d2 all sides c critical section for twoway shear b critical section for oneway shear a critical section for flexure outside face of concrete column or line midway between face of steel column. Hvac systems design fundamentals karachi, pakistan, february 22, 2011 wei sun, p. Instructional materials complementing fema p 751, design examples foundation analysis and desing foundation design 1. The ratio of the total costs was found to be within the range 1. The analysis and design of posttensioned, twoway slabs incorporate the full tributary slab width without the distribution of forces and reinforcement between column strips and middle strips, synonymous with mild reinforced two. The codes governing the design of the oneway slab will be aci 31802 and ibc 2003. Blended portland cement type sf, may be used in class dp or hp concrete.
Instructional materials complementing fema p751, design examples. Youll need an engineer to design your footings to solve these problems. Fundamentals of posttensioned concrete design for buildings part one. The p classification acts as a warning bell to the footingslab designer that particular site features need to be considered when designing the footings. Flat slab system is an important division of concrete floor system. Steel rods aiiia400 and steel wires bpi are used as reinforcement. Twoway slabs have two way bending unlike oneway slab. In the current research, a parametric study was carried out to investigate the structural response of industrial slab. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Class p sites class p sites are those sites that may contain some of the features described in the table below. This report is intended to serve as a manual of good practice for the design of prestressed concrete flat slabs in addition to the recommended procedures, other methods are described for the sake of completeness and to compare different methods of design. Design of reinforced concrete 10th edition pdf free. The pt slab analysis and design is a most complicated process because it involves primary moments from basic frame analysis and secondary moments from pt forces.
Simply supported one way slab a rectangular reinforced concrete slab is simplysupported on two masonry walls 250 mm thick and 3. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. This standard does not include design details for class p sites. Manual for the design of reinforced concrete building. Having poor or uncertified fill could result in a p class soil but an engineer could just design a modified m slab which might be a standard inclusion anyway which was us. Asce, secb course content slab on grades construction. Whoever is building your house will be the one to speak to because it varies between builders. The proposed slab system must meet the current code. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is 456.
As 28701996 residential slabs and footingsconstruction. These materials are originally located at different websites. The p classification acts as a warning bell to the footing slab designer that particular site features need to be considered when designing the footings. Analysis and design of slabs two way civil engineers pk. A simple way to think of it, which is like how the buidler explained, a h2 slab will be used, but due to the extra problems of the site p class, the slab needs extra support.
Flat slab analysis, design and detailing pdf civil. When approaching a class p site, engineers at intrax consider various elements, as discussed below, to find the. The slab is positioned on steel tbeams which can be rolled or compound. The proposed slab system must be able to be constructed at a reasonable cost. Design of reinforced concrete structures ii twoway slabs. In such a design, a wedge slides cross a general passageway in order to control fluid flow like a sliding gate hence, the name. Reinforced concrete slab design and detailing guide is456. Data is taken from manufacturers tables yield strength of steel, f yp 280 nmm 2 design thickness, allowing for zinc, t p 0. Reinforced cast on site concrete, 3 different floor solutions. Using udls simplifies the analysis and remains popular. Instructional materials complementing fema p 751, design examples reinforced concrete footings.
There is a nominal strength that is reduced by a factor which must exceed the factored design stress. Slabs may be supported on two sides only or have beams on all four sides. The following example illustrates the design methods presented in aci 31805 and ibc 2003. There are several factors that may greatly affect the design of slab footings on these sites. Sto 00472005 coiled steel is used for profiled sheets. If slab supported by four side of beams or walls, the slab is considered oneway if ratio of long span ly to short span lx greater than 2. In twoway slabs shorter direction strip carry greater %age of load. Some advisory material is included in the commentary. Heavy loads in building s such as warehouses include moving load s. There are various established methods for analysing ribbed slabs and dealing with the solid areas. Thus p is an extra given to your site because it has extra problems. Furthermore, assume that the top of the footing is 2 feet below grade the overlying soil. Ongrade concrete floor slabs shall be placed on a 4inch fill of coarse aggregate or on a. Australian standard residential slabs and footings materialstandard.
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