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