Palo verde, california structural design of mat raft foundation first draft. Example analysis using data from the portland cement association engineering bulletin 232, aashto lrfd design of castinplace concrete bridges this example demonstrates how slab bridge designer 2. Sci p300 composite slabs and beams using steel decking best. Safe is the ultimate tool for designing concrete floor and foundation systems. Asce, secb course content slab on grades construction. If the soil is unsuitable to hold the slab load design, pontex is used which in turn will create a one directional. Download geotechnical engineering software safe 2016 developed by computers and structures inc. For the flat slab with the general arrangement as shown below, let us design the punching shear for column b1 given the following design information.
The following example illustrates the design methods presented in the article timesaving design aids for reinforced concrete, part 2. Design of replacenent upper roof introduction as part of the works at south kensington station asset stabilization program there is a requirement for a design of replacement upper roof. A six storey building for a commercial complex has plan dimensions as shown in figure 1. Reinforced concrete ribbed slabs with widebeam lajes. Pile supported foundation pile cap analysis and design. Equivalent tensile stress design appendix 5examples using shrinkagecompensating concrete, p. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter.
For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. Unsubscribe from computers and structures, inc sign in to add this video to a playlist. If you continue browsing the site, you agree to the use of cookies on this website. From framing layout all the way through to detail drawing production, safe integrates every aspect of the engineering design process in one easy and intuitive environment. 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. The slab is to be finished with 25 mm thick cement concrete flooring. For slabs spanning in both directions published tables and charts should be used to find bending moment and shear per unit width of slab.
Ce 437537, fall 2002 slabongrade example design info 1 8. Refer to page r 2 for the location of the roof area to be designed. Example a mat foundation is to be design by the conventional method. Design example on composite steel deck floor slabs by thomas j. Would have been unsafe and uneconomical to assume it uniform over the entire transverse.
With some limitations, reinforcement for slabs can be sized using the subgrade drag theory in order to increase the spacing of control or construction joints. The lateral loads are independently resisted by shear walls. Ce 437537, fall 2002 slab ongrade example design info 1 8 design the thickness for a slab ongrade concrete slab in a warehouse. Design criteria for deflection capacity of conventionally. Introduction concrete slabs on grade are a very common type of concrete construction. Nov 27, 20 one way slab design criteria with design example according to aci code slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Heavy loads in building s such as warehouses include moving load s, stationary live loads, and wall loads. Example design combinations for deflection quasipermanent derived for typical uk reinforced concrete design. Pdf ribbed slabs have been widely used in buildings due to their many. Reinforced concrete slabs compatibility limit design. The 2012 edition of the reinforced concrete design manual sp1711 was developed in accordance with the design provisions of aci 31811, and is consistent with the format of sp1709. Nagy 1 and istvan szatmari 2 technical university of budapest, department of steel structures h1521 budapest summary there is an enhanced intention imposed on building construction industry to improve time and structural efficiency of structures. Two way slab design by direct design method as per aci 31811.
Two way slab design by direct design method as per aci 31811, step by step procedure and limitations of direct design method for two way slab is presented. Design manual to bs8110 outline of the bs8110 design process outline of the bs8110 design process calculate vc concrete shear capacity without reinforcement the design process for the now withdrawn bs8110 design standard works slightly differently to that used in. Twoway joist concrete slab floor waffle slab system analysis and design design the concrete floor slab system shown below for an intermediate floor with partition weight of 50 psf, and unfactored live load of 100 psf. Master of science and hereby certify that, in their opinion, it is worthy of acceptance. Assume partitions cannot be damaged by deflections. We assume that the verandah slab is a two way slab instead of one way slab in order to calculate mb,neg now, using moment coefficient method for analysis. The two examples in this tutorial provide stepbystep illustrations of how safe can be used to create, analyze, design and detail concrete slab systems. The bearing of the slab on the supporting walls may be taken as 230 mm. Bending will take place in the two directions in a dishlike fo. Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2. Design of waffle slab without beams by direct design method 32 32 32 c 1 c 2 c 3 c 4 2 c 5 c 6 c 7 c 8 32 s ss 22 3 7 c 9 c 10 c 11 c 12 32 8 11 b 1210 bb c c 14 c 15 c 16 16. Oneway and twoway slabs oneway slabs transfer the imposed. Structural design guidance provided in previously published three sci publications, design of composite beams using precast concrete slabs p287, design of asymmetric slimflor beams with precast concrete slabs p342. The first example is for a mildreinforced concrete slab rc, and the second example deals with a posttensioned structure pt.
Design of matraft foundation mat or raft foundation is a large concrete slab supporting several columns in two or more rows. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Design example of punching shear in slabs eurocode 2. The building is located in seismic zone iii on a site with medium soil.
Adopt m 15 grade of concrete and mild steel reinforcement. It is used where the supporting soil has low bearing capacity. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. Structural steel composite slab 1 of 7 rev design project. Moment division example 6000 6000 6000 6000 6000 5000 layout of building 7000. Design of reinforced concrete structures ii twoway slabs 1 1. The oneway slab is deflected in one way direction and primary reinforcement is placed in one direction whereas. Concrete slabs behave primarily as flexural members and the design is. How to design concrete structures using eurocode 2. Design the concrete slab and calculate the required tensile reinforcement for the main and the secondary direction. Punching shear strength of reinforced concrete slabs without transverse reinforcement article pdf available in aci structural journal 1054 july 2008 with 11,882 reads how we measure reads. Unfortunately, this book cant be printed from the openbook. As an introductory example consider the uniformly loaded beam shown in fig.
Design of flat slab with drop in safe 2016 part duration. 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. Design the minimum slab thickness to support a fork lift specified below and storage racks specified below throughout. As the slab is designed as simply supported, only anticrack reinforcement is needed. Unless otherwise noted, all referenced table, figure, and equation numbers are from that article. Design a thickened slab to support the columns and. The attachment of non structural elements is the responsibility of the architect or designer, unless specifically shown otherwise. The cross section of the profiled sheeting is shown in fig. This guide covers the design and construction of composite slabs and beams, and addresses the. Worked examples presented at the workshop eurocode 7.
Pdf punching shear strength of reinforced concrete slabs. In twoway slabs shorter direction strip carry greater %age of load. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. Design of reinforced concrete structures ii twoway slabs. Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. The recommendations derived from these and other studies vary from extremely light to extremely heavy. The slab is supported on beams of size 225 x 500 mm spaced at 4. A typical example of the decking layout for a composite floor is shown in. Designed to resist moment due to downward pressure from the weight of retained earth plus surcharge, if any and concrete slab safety factor f1, 2 and f3 should be considered to provide a combination which gives the critical design conditions worst. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length.
Aci 360, design of slabsongrade, refers to this as a type b slab. Pile supported foundation pile cap analysis and design based on a geotechnical study, a pile supported foundation is required to support a heavily loaded building column. Specifically, it integrates slab design moments across design strips and designs the required reinforcement. Slabs and flat slabs lecture 5 19 th october 2016 contents lecture 5 designing for shear in slabs including punching shear detailing solid slabs flat slab design includes flexure worked example exercise punching shear. This appendix presents design examples of the retrofitting techniques for elevation, dry floodproofing, wet. Aci 360, design of slabs ongrade, refers to this as a type b slab. Examples c1 through c5 are a set of examples that illustrate the elevation of a singlestory home with a crawlspace. The manual and advisory safety code of practice for concrete pumping67. Design of reinforced concrete slab with regard to explosions. It was actually the widespread use of the posttensioned slabonground which induced this interest in design procedure and in many studies of reported slab failures. Flat slab analysis, design and detailing pdf civil. Manual for design and detailing of reinforced concrete to. Find the following parameters for design moments in step 2 per unit width step 4 note. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design.
If you need to print pages from this book, we recommend downloading it as a pdf. Design and construction of concrete formwork 75 several considerations are involved in determining an economical form construction, such as. Twoway slabs have two way bending unlike oneway slab. The brazilian code, for example, proposes that ribbed slabs are. F is the total design ultimate load on the strip of slab between adjacent columns considered 1. Twoway joist waffle slab design approach and methodology.
A2 slab thickness design by wri method a3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. Reinforced concrete slab design and detailing guidelines for depth of slab, loads on slab, reinforcement guide for oneway and twoway slabs as per is following are the rcc slab design and detailing guidelines. Pontex is recycled polypropylene element that, combined with cupolex can be used to create beams so that aerated floors become selfbearing. Design of slab for flexure 067 m unit width of slab. Fanella, which appeared in the october 2001 edition of structural engineer magazine. Plan view of floor system assume partitions will not be damaged by deflections. Reinforced concrete design 1 design of slab examples.
They may be supported on two opposite sides only fig. Continuous one way slab figure 1 shows a clear area of 12 m x 8. Pdf this paper deals with the problem of optimum design of reinforced concrete. Ce 433, fall 2006 slab design example 1 6 design a oneway slab for an exterior bay of a multistory office building using the information specified below. Total moment in slabs supported on circular column capitals 0 moments at design sections of slabs supported on. Twoway joist waffle slab design approach and methodology twoway joist slab often called twoway ribbed slab or waffle slab is an economical floor system when the spans are long andor loads are high. Bridge approach slab analysis and design incorporating elastic soil support presented by. Design the 4 marked slab panels of an ordinary house. The results of the study show that the slab can be successfully used for residential buildings as it meets all the requirements and demands fewer materials. Cost and feasibility of adapting materials on hand vs.
To see an example of the strip method and to illustrate the choices open to the designer. Design the pile cap shown in the following figure with 12 in. The following example illustrates the example building. Generally, there are two types of slab which are one way and two way slabs. Reinforced concrete design 1 design of slab examples and. Bending will take place in the two directions in a dishlike form. Jul 22, 2015 design of two way ribbed slab 18 x 25 m clear span 1.
Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. Generally, load set 2 will be used for beams and slabs in the uk as it. Foundation design generalized design steps design of foundations with variable conditions and variable types of foundation structures will be different, but there are steps that are typical to every design, including. Analysis and design of slabs two way civil engineers pk. This session is not intended to teach concrete design, but more of an awareness of why things are the way they are. Design manual for bridges and structures sixth edition, 2016 nj. Waffle slab analysis and design is similar to the procedure used with flat plates except that special considerations need. Composite slab worked example 1 made by sssr date 140500 structural steel design project calculation sheet checked by pu date 080800 check the adequacy of the continuous composite profiled deck slab with spans of 3. The construction and design of concrete slabs on grade d. Since this is a potentially unsafe assumption, the. Pdf optimum design of reinforced concrete waffle slabs. In the current design, since the point pressure is within the allowable value. Reinforced concrete wall design basics mike oshea, p. Geotechnical design dublin, 14 june, 20 support to the implementation, harmonization and further development of the eurocodes.
Chapter 3 design of rectangular beams and oneway slabs 12. The superimposed load on the slab is to be 3500 n per square metre. Punching shear safe 2016 tutorial example and practical. Safe provides an immensely capable yet easytouse program for structural designers, provideing the only tool necessary for the modeling, analysis, design, and detailing of concrete slab systems and foundations. Instructional materials complementing fema p751, design examples reduction of overturning moment nehrp provisions allow base overturning moment to be reduced by 25% at the soilfoundation interface for a moment frame, the column vertical loads are the resultants of base overturning moment, whereas column moments are. Example calculations for this and all other example problems the following data from the canam united steel deck design manual and catalog of steel deck products will be used and are worked using lrfd methodology. Twoway joist concrete slab floor waffle slab system.
In addition to general ultimate and serviceability limit state design issues, practical design considerations such as the formation of holes in the slab, support details, fire protection, and attachments to the slab are discussed. The design of composite slabs and beams is discussed in detail in relation to the eurocodes and bs 5950. Mccabe1 the enclosed example is presented to demonstrate the intent and use of the aisi tentative recommendations for the design of composite steel deck slabs, and hereafter will be referred to as the criteria. Reinforced concrete slab design and detailing guide is456. A copy of the tables is provided in the appendix and also. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs onground. Rectangular beams and oneway slabs page 5 of 9 maximum permissible steel ratio, max an overreinforced beam will fail in a brittle manner while an underreinforced beam will. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Three worked examples of precast unit floors in different building types are also included. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. The crosssectional area of the reinforcement above the ribs should be not less than 0. Refer to document knukdescds1890003 rev 04 for conceptual design statement. In this video, we investigate how to analyze a slab for punching shear, how to design rebar and stud rails, and some theory, tips and tricks.