Nalitolela for the department of civil engineering of mbeya university of science and technology. Slab on grade is a misnomer, since these types of foundations invariably include turneddown edges similar to, but not as. Slab design construction of slabs on ground design considerations based on aci and astm. The crosssectional area of the steel is inserted into engineering formulae found in aci 318 to determine the load carrying capacity for a given slab design. Design of heavy duty concrete floor slabs on grade. Question for residential projects related to structural slabongrades. Concrete slab design procedure7 design of continuous slab basics of reinforced concrete slab design slabs are generally designed on the assumption that they consists of. Interior walls of the living area elevated are composed of 2x4 studs at 16 inches on center o.
Concrete slab on grade analysis calculator for post or wheel. Decking a structural element usually constructed from corrugated bent plate used to form an elevated slab. Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. Online concrete slab on grade analysis calculator for slab subjected to interior concentrated post or wheel loading assuming slab is reinforced for shrinkage and temperature only. 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. Download free demo updated august 8, 2019 soilstructure slab on grade software simplifies the calculation of a. An introduction to structural design criteria for buildings.
After this publication, it was subsequently adopted by the uniform building. The slab thickness depends on the type of loads on the floor slab. Determine the loads based on the buildings parameters section d. Pdf design of stiffened slabsongrade on shrinkswell soils. An interior load condition is assumed for flexural analysis.
Stiffened slab on grade elevated structural slab on piers stiffened slab on grade and on piers thin post tensioned slab figure 1. Nov 12, 2018 slabs which are directly laid on the earth to support walls and other structural elements are called as slab on grade or grade slabs. Grdslab is a spreadsheet program written in msexcel for the purpose of analysis of concrete slabs on grade. The slab is outside buildings which subjected to 1 hr fire resistance and design for 50 years design life. The designer determines the required slab thickness after determining the controlling loads, the appropriate safety fact o r, and the subgrade modulus. Direct design method ddm for slab systems with or without beams loaded only. These calculations shall govern the structural portion of the working drawings. Stresses in floor slabs on grade resulting from vehicular loads a re a function. A six storey building for a commercial complex has plan dimensions as shown in figure 1. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs onground. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Slab on grade or grade slab types construction procedure.
Often times we are designing slabs as structural slabs even though they are on grade either due to void form requirements, or backspanning of backfill, etc. These design elements must be enlisted and added in the contract documents by the designer in charge before asking for a bidding. The building is located in seismic zone iii on a site with medium soil. Tekla structural designer concrete beam design duration. The direct design method gives rules for the determination of the total static design moment and its distribution between negative and positive moment sections. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. The structural calculations included here are for the analysis and design of primary structural system.
Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2. Fpasc010 foundation design options for residential and other lowrise buildings on expansive soils 30 june 2004 issued for website publishing foundation performance association structural committee page 2 of 41 preface this document was written by the. Structural slab on grade structural slab fully suspended floor slab on beampile or stem wall foundations and structural ribbed slab reasons for a structural cupolex floor slab may include. The lateral loads are independently resisted by shear walls. Concrete slab design procedure7 design of continuous slab basics of reinforced concrete slab design slabs are generally designed on the assumption that they consists of a number of beams of breadth one. The basic objective in structural analysis and design is to produce a structure capable of resisting all applied loads. A3design examples using coe charts a4slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. Analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. Reinforcing is added to control shrinkage cracking and maximize the distance between designed joints.
The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete. Calculators for structural engineers, construction professionals and steel building specifiers. Kammel, professor, biological systems engineering department. Develop and report on criteria for design of slabs on grade, except highway and airport pavements 1. The structural design of a concrete floor slab on grade is primarily controlled by the stresses caused by moving live loads and in some cases the stationary loads. Tm 580912 concrete floor slabs on grade subjected to heavy. A3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l.
Learn more about construction procedure with video explanation. Construction of slab on ground design elements the construction of slab on ground requires certain basic design elements. Complete structural analysis, design and detailing of substation control houses, including interior steel roof beams and columns, spread footings, hollowcore roof slab, slab on grade, wall perimeter footing, wall openings and embedded plate design for support attachments. Tm 580912 concrete floor slabs on grade subjected to. Slab on grade design guidance structural engineering. Design forces the loads that act on the structural system, e. The major structural components of a slabongrade foundation are the floor slab itself and either grade beams or foundation walls with footings at the perimeter of the slab see figures 42 and 43. Pdf compressive strength of concrete cube test pdf, procedure, results. Introduction concrete slabs on grade are a very common type of concrete construction. In most cases, the slab thickness is designed as an unreinforced concrete section.
Aci 360, design of slabsongrade, refers to this as a type b slab. What is a good resource for design a slab on grade subjected to a column load. Reinforced concrete design 1 design of slab examples. The slab on grade worksheet assumes a structurally unreinforced slab, aci360.
Structural design calculations project south kensington station stabilisation permanent works to upper roof project no. Pdf aci 360r92 design of slabs on grade reported by aci. Slab design in tekla structural designer tekla software. This bending of the foundation is due to the shrinking and swelling of the soil during the dry and wet seasons under the edges of the structure. As such, the guide is organized around the following major objectives. Consequently, aci 360 was formed with this mission. Heavy arch ribs designed to resist axial force and bending. Pdf this article presents a methodology for designing slabs on grade for industrial floors where. Structural design calculations project south kensington station stabilisation permanent works to upper roof. Question for residential projects related to structural slab on grades. Complete structural analysis, design and detailing of substation control houses, including interior steel roof beams and columns, spread footings, hollowcore roof slab, slabongrade, wall perimeter footing, wall openings and embedded plate design for support attachments. Is the total structural dead weight sufficient to prevent flotation of the house from.
Often times we are designing slabs as structural slabs even though they are on grade either due. The structural design of a concrete floor slab on grade is. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Pdf a new method for designing floor slabs on grade due to the. Flat slab analysis, design and detailing pdf civil engineering. Difference between structural concrete slab and plain. Type b, reinforced only for shrinkage and temperature. Reinforced concrete design 1 design of slab examples and. Asce, secb course content slab on grades construction. 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.
Slabsongrade over backfill that are adjacent to basement walls shall be doweled into foundation wall and shall be design as structural slabs to span over the backfill to avoid settlement at less compacted soil. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabsonground. I have a column with an 18kip vertical load and soil with 150 pci subgrade modulus and im wondering if i can use a 12 slab. The attachment of non structural elements is the responsibility of the architect or designer, unless specifically shown otherwise. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs on ground. How to design a concrete slab on grade duane craig pin share tweet share email a foundation is an extremely critical part of the building. General design process though many details must be included in the design of a slab on grade, three important components are slab thickness, reinforcement requirements, and joint spacing. Mar, 2019 the slab on grade worksheet assumes a structurally unreinforced slab, aci360. The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. Both slab on grade and structural slabs can be created using this formwork. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. Slab on grade design process c posttensioning tendons are generated.
A civil engineer should study these lectures and materials for structural engineering acumen. Background information on design theories is followed by discussion. Stresses in floor slabs on grade resulting from vehicular loads are a function of. Flat slab analysis, design and detailing pdf civil. There are two different types supported slab on grade and monolithic slab on grade. Residential structural design guide v preface this document is a unique and comprehensive tool for design professionals, particularly structural engineers, seeking to provide valueadded services to the producers and consumers of american housing. Design the minimum slab thickness to support a fork lift specified below and storage racks specified below throughout. An introduction to structural design criteria for buildings course no. A structurally reinforced slab on ground uses a composite of concrete and structural steel to support the design load. Manual for design and detailing of reinforced concrete to. Fatigue failure due to slab flexure erosion failure due to foundation compression edge loads produce the worst stresses fatigue based on tensile stress due to edge loads corner loads produce the worst deflections erosion based on deflections due to corner loads 2.
It addresses the planning, design, and detailing of slabs. Dead load the weight of the structural frame or element itself plus any equipment permanently attached to it. Floor slab design floors are designed as slabs on grade. For most commercial and industrial floors, joint spacing is dictated by the location of columns or racks within the structure.
Slabongrade design process c posttensioning tendons are generated. To calculate the applied bending moment, the structural. Aci 360, design of slabs on grade, refers to this as a type b slab. The construction and design of concrete slabs on grade d. Is the total structural dead weight sufficient to prevent flotation of the house from the buoyancy. The major structural components of a slab on grade foundation are the floor slab itself and either grade beams or foundation walls with footings at the perimeter of the slab see figures 42 and 43. Grdslab concrete slab on grade analysis spreadsheet. Concrete slab on grade analysis calculator for post or.
Concrete slab on grade analysis the engineering community. The efm defines an equivalent frame for use in structural analysis to determine the negative and positive moments acting on the slab system. April 2008 discussions on design issues for structural engineers. The slab is outside buildings which subjected to 1 hr fire resistance and design for 50 years. That is, the concentrated post or wheel load is assumed to be well away from a free slab edge or corner. Some foundations used for light buildings on shrinkswell soils. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. Construction of slabs on ground design considerations aci. Besides these advantages, there are significant cost savings to the builder and owner by using the cupolex flooring formwork in the design of aerated concrete slabs for residential, industrial, commercial. Design of slabs on grade aci committee was specifically charged to cover design. Development of the design approach the primary design issues for stiffened slabs on grade are the sizing of the beams. Soil conditions the design procedure shown in this report is based on the use of the effective p. The structural observer shall report findings to the building inspector pursuant to section 1704.
Twoway joist concrete slab floor waffle slab system. Concrete structural design design all concrete facilities with two criteria in mind. Columns and deck not designed to resist longitudinal bending very flexible. Unsuitable ground conditions very low bearing pressures or expansive soils vapor, humidity, radon, methane. Concrete slab supported di rectly on foundation soil. Foundations come in many types, and each one has its strengths and weaknesses. The selection of slab thickness from structural viewpoint is often dictated by deflection control criteria. However, where any discrepancies occur between these calculations and the working drawings, the engineer shall be notified immediately so proper action may be taken. Design of slab examples and tutorials by sharifah maszura syed mohsin. Structural slabsongrade structural engineering general. Flat slab analysis and design pdf flat slab design pdf 1. Guide to design of slabs onground reported by aci committee 360 aci 360r10 this guide presents information on the design of slabs onground, primarily industrial floors.
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