Slab on Ground Design Workshop

Venue: Best Western Abercorn Inn

Location: vancouver, BC, British Columbia, Canada

Event Date/Time: Oct 21, 2010 End Date/Time: Oct 22, 2010
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This course is a practical structural design course that contains step-by-step procedures that include instructions that help understand and design for slab on ground. This course presents information on the design of slabs-on-ground, primarily industrial floors. The course addresses the planning, design, and detailing of slabs. Background information on design theories is followed by discussion of the types of slabs, soil-support systems, loadings, and jointing. Design methods are given for unreinforced concrete, reinforced concrete, shrinkage-compensating concrete, post-tensioned concrete and fiberreinforced concrete slabs-on-ground, followed by information on shrinkage and curling problems. Advantages and disadvantages of each of these slab designs are provided, including the ability of some slab designs to minimize cracking and curling more than others. Several design methodology will be introduced including the ACI design methodology. Examples using several design methods are also provided.


Additional Information

Objectives: This course will provide the participants with an understanding of the subgrade drag theory and how it relates to the reinforcing of slab-on-grades as required to help control shrinkage cracking. Two other alternate design methods are also discussed relative to the sizing of "distribution" slab-on-grade reinforcement. Different types of reinforcing materials are also discussed including welded wire fabric, conventional deformed reinforcing bars and post-tensioning tendons. Target Audience Structural site Engineers and even design Engineers needing to refresh their design skills according to the new building code and design standards Structural contractors wanting to know how the structures they erect are designed Structural draftsmen wanting to know how the structures they draw are designed Architects and non-structural engineers such as Mechanical, Electrical and Plant Engineers interested in upgrading their knowledge and skills in the area of structural design Learning Outcomes This course will introduce you to the current codes and standards that govern structural design of slab on ground, including the structural provisions of the ACI . You will also learn: Basic understanding of codes and design methods. This course will enable the user to become familiar with the following methods of designing slab-on-ground: PCA method Slab thickness design by WRI method COE charts Equivalent tensile stress design Shrinkage-compensating concrete using post-tensioning to minimize cracking Program Outline (1.2 CEUs / 12 PDHs) Concrete slabs-on-ground are highly susceptible to cracking due to shrinkage. Construction and control joints are typically used to control crack location. Since it is not always desirable or practical to use a large number of closely spaced joints, reinforcing of the slab-on-grade allows for greater flexibility with joint spacing. Welded wire mesh or deformed bar reinforcement normally used in slabs-on-ground helps to control the width or growth of any cracks that may occur. This type of steel is sometimes called distribution reinforcement to differentiate it from structural reinforcement that is added to increase the load-carrying capacity of the slab. Introduction Design theories for slabs-on-ground Slab types Design and construction variables Support systems for slabs-on-ground, Geotechnical engineering reports Subgrade classification Modulus of subgrade reaction Design of slab-support system Site preparation Inspection and site testing of slab support Special slab-on-ground support problems Loads Vehicular loads, concentrated loads, distributed loads, line and strip loads, unusual loads & construction loads Environmental factors Factors of safety Joints Load-transfer mechanisms Sawcut contraction joints Joint protection Joint filling and sealing Design of unreinforced concrete slabs Thickness design methods Shear transfer at joints Maximum joint spacing Design of slabs reinforced for crackwidth control Thickness design methods Reinforcement for crack-width control only Reinforcement for moment capacity Reinforcement location Design of shrinkage-compensating concrete slabs Thickness determination Reinforcement Design of post-tensioned slabs-onground Applicable design procedures Slabs post-tensioned for crack control Industrial slabs with post-tensioned reinforcement for structural support Residential slabs with post-tensioned reinforcement for structural action Design for slabs on expansive soils Design for slabs on compressible soil Fiber-reinforced concrete slabs-onground Polymeric fiber reinforcement Steel fiber reinforcement