As such, the guide is organized around the following major objectives. Powered by the equivalent frame method of analysis and design per latest american aci 31814 and canadian csa a23. 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. Concrete slab on grade analysis calculator for post or wheel. The result is a lightly reinforced slab designed to offset the effects of temperature and shrinkage of the concrete.
Structural design calculations project south kensington station stabilisation permanent works to upper roof. Grdslab concrete slab on grade analysis spreadsheet. Slab design in tekla structural designer tekla software. Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2. Stiffened slab on grade elevated structural slab on piers stiffened slab on grade and on piers thin post tensioned slab figure 1. Type b, reinforced only for shrinkage and temperature. The slab thickness depends on the type of loads on the floor slab. The efm defines an equivalent frame for use in structural analysis to determine the negative and positive moments acting on the slab system.
Flat slab analysis, design and detailing pdf civil engineering. Manual for design and detailing of reinforced concrete to. Reinforced concrete design 1 design of slab examples. 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. After this publication, it was subsequently adopted by the uniform building. Question for residential projects related to structural slab on grades. Slab on grade is a misnomer, since these types of foundations invariably include turneddown edges similar to, but not as. To calculate the applied bending moment, the structural. The structural design of a concrete floor slab on grade is. It addresses the planning, design, and detailing of slabs.
Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs on ground. Design of slabs on grade aci committee was specifically charged to cover design. 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. Aci 360, design of slabsongrade, refers to this as a type b slab. Learn more about construction procedure with video explanation. 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. Background information on design theories is followed by discussion. Pdf aci 360r92 design of slabs on grade reported by aci.
Slab on grade design guidance structural engineering. Design the minimum slab thickness to support a fork lift specified below and storage racks specified below throughout. Determine the loads based on the buildings parameters section d. 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. Nalitolela for the department of civil engineering of mbeya university of science and technology. A3design examples using coe charts a4slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. Unsuitable ground conditions very low bearing pressures or expansive soils vapor, humidity, radon, methane. What is a good resource for design a slab on grade subjected to a column load. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabsonground. Construction of slabs on ground design considerations aci. Stresses in floor slabs on grade resulting from vehicular loads are a function of. Decking a structural element usually constructed from corrugated bent plate used to form an elevated slab. Grdslab is a spreadsheet program written in msexcel for the purpose of analysis of concrete slabs on grade.
Slab on grade or grade slab types construction procedure. 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. The building is located in seismic zone iii on a site with medium soil. Often times we are designing slabs as structural slabs even though they are on grade either due. Structural design calculations project south kensington station stabilisation permanent works to upper roof project no. The structural calculations included here are for the analysis and design of primary structural system. The slab is outside buildings which subjected to 1 hr fire resistance and design for 50 years. Concrete structural design design all concrete facilities with two criteria in mind. Dead load the weight of the structural frame or element itself plus any equipment permanently attached to it. Pdf this article presents a methodology for designing slabs on grade for industrial floors where. Consequently, aci 360 was formed with this mission.
The wire reinforcing institute recommends the use of the subgrade drag theory for slabs up to 150 feet in length. 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. Ce 437537, fall 2002 slabongrade example design info 1 8 design the thickness for a slabongrade concrete slab in a warehouse. Flat slab analysis and design pdf flat slab design pdf 1. Concrete slab on grade analysis the engineering community. In most cases, the slab thickness is designed as an unreinforced concrete section. For most commercial and industrial floors, joint spacing is dictated by the location of columns or racks within the structure. Construction of slab on ground design elements the construction of slab on ground requires certain basic design elements. Foundations come in many types, and each one has its strengths and weaknesses. Stresses in floor slabs on grade resulting from vehicular loads a re a function.
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. The selection of slab thickness from structural viewpoint is often dictated by deflection control criteria. Kammel, professor, biological systems engineering department. Slabongrade design process c posttensioning tendons are generated. Design of slab examples and tutorials by sharifah maszura syed mohsin.
Soil conditions the design procedure shown in this report is based on the use of the effective p. Heavy arch ribs designed to resist axial force and bending. Floor slabs can range from a simple residential basement slab to a heavyduty industrial floor. Twoway joist concrete slab floor waffle slab system. A civil engineer should study these lectures and materials for structural engineering acumen. An introduction to structural design criteria for buildings. The slab on grade worksheet assumes a structurally unreinforced slab, aci360. 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. The attachment of non structural elements is the responsibility of the architect or designer, unless specifically shown otherwise. Interior walls of the living area elevated are composed of 2x4 studs at 16 inches on center o. 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.
Introduction concrete slabs on grade are a very common type of concrete construction. A3 design examples using coe charts a4 slab design using posttensioning a5shrinkagecompensatingconcreteexamples chapter lintroduction l. Question for residential projects related to structural slabongrades. Pdf compressive strength of concrete cube test pdf, procedure, results.
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. These calculations shall govern the structural portion of the working drawings. Download free demo updated august 8, 2019 soilstructure slab on grade software simplifies the calculation of a. Analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. A structurally reinforced slab on ground uses a composite of concrete and structural steel to support the design load. Both slab on grade and structural slabs can be created using this formwork. Develop and report on criteria for design of slabs on grade, except highway and airport pavements 1. The construction and design of concrete slabs on grade d. Tm 580912 concrete floor slabs on grade subjected to. Concrete slab on grade analysis calculator for post or. Aci 360, design of slabs on grade, refers to this as a type b slab. 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. The basic objective in structural analysis and design is to produce a structure capable of resisting all applied loads.
Is the total structural dead weight sufficient to prevent flotation of the house from the buoyancy. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabs onground. Slab design construction of slabs on ground design considerations based on aci and astm. There are two different types supported slab on grade and monolithic slab on grade. Asce, secb course content slab on grades construction. Slabs which are directly laid on the earth to support walls and other structural elements are called as slab on grade or grade slabs. The structural observer shall report findings to the building inspector pursuant to section 1704. These design elements must be enlisted and added in the contract documents by the designer in charge before asking for a bidding.
Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. 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. The design procedure set forth in that publication had at that time been in use by the author for about 15 years. Mar, 2019 the slab on grade worksheet assumes a structurally unreinforced slab, aci360. Reinforced concrete design 1 design of slab examples and. Development of the design approach the primary design issues for stiffened slabs on grade are the sizing of the beams. Pdf design of stiffened slabsongrade on shrinkswell soils. Flat slab analysis, design and detailing pdf civil. The slab is outside buildings which subjected to 1 hr fire resistance and design for 50 years design life. However, where any discrepancies occur between these calculations and the working drawings, the engineer shall be notified immediately so proper action may be taken. 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. The lateral loads are independently resisted by shear walls.
Slab on grade design process c posttensioning tendons are generated. Structural slabsongrade structural engineering general. Tm 580912 concrete floor slabs on grade subjected to heavy. Design of heavy duty concrete floor slabs on grade. The direct design method gives rules for the determination of the total static design moment and its distribution between negative and positive moment sections. 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. 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. 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. Tekla structural designer concrete beam design duration.
Reinforcing is added to control shrinkage cracking and maximize the distance between designed joints. Concrete slab supported di rectly on foundation soil. Difference between structural concrete slab and plain. An introduction to structural design criteria for buildings course no. 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. Information on other aspects, su ch as materials, construction methods, placement of concrete, and finishing techniques, is. Floor slab design floors are designed as slabs on grade. 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. April 2008 discussions on design issues for structural engineers. Ce 437537, fall 2002 slabongrade example design info 1 8. Columns and deck not designed to resist longitudinal bending very flexible.
Is the total structural dead weight sufficient to prevent flotation of the house from. 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. 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. 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.
The designer determines the required slab thickness after determining the controlling loads, the appropriate safety fact o r, and the subgrade modulus. 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. Calculators for structural engineers, construction professionals and steel building specifiers. Pdf a new method for designing floor slabs on grade due to the.
Direct design method ddm for slab systems with or without beams loaded only. Design forces the loads that act on the structural system, e. The construction and design of concrete slabs on grade. 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. An interior load condition is assumed for flexural analysis. 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. A six storey building for a commercial complex has plan dimensions as shown in figure 1.
638 1443 554 367 1316 263 1203 868 1300 1530 1049 1154 1515 947 789 308 890 799 1016 1165 598 769 716 411 1207 123 1263 172