Design Slabs on Grade, ACI 360R-92

Description

Design Slabs on Grade, ACI 360R-92 (Reapproved 1997) Boyd C. Ringo - Chairman, 57 pagesIntroduction This report covers the design of slabs on grade for loads caused by material stored directly on the slab or on storage racks, as well as static and dynamic loads associated with handling equipment and vehicles. Other loads, such as loads on the roof transferred through dual purpose rack systems are also covered. ACI Committee 360 considers use of the information presented in this report reasonable for slabs on grade which support structural loads provided the loading limit of the above definition is satisfied. In addition to design of the slab for these loadings, the report discusses subgrade-subbase, shrinkage and temperature effects, cracking, curling or warping, and other items affecting the design. Although the same general principles are applicable, the report does not specifically address the design of highways, airport pavements, parking lots, and mat foundations.CONTENTS Chapter l-Introduction, pg. 360R-2 l.l-Purpose and scope 1.2-Work of Committee 360 and other relevant committees 1.3-Work of non-ACI organizations 1.4-Design theories for slabs on grade 1.5-Overview of subsequent chapters Chapter 2-Slab types and design methods, pg. 360R-4 2.1-Introduction 2.2-Slab types 2.3-Design and construction variables 2.4-Design methods 2.5-Fiber-reinforced concrete (FRC) 2.6-Conclusion Chapter 3-Soil support systems for slabs on grade, pg. 360R-8 3.1-Introduction 3.2-Soil classification and testing 3.3-Modulus of subgrade reaction 3.4-Design of the slab support system 3.5-Site preparation 3.6-Inspection and site testing of soil support 3.7-Special problems with slab on grade support Chapter 4-Loads, pg. 360R-15 4.1-Introduction 4.2-Vehicle loads 4.3-Concentrated loads 4.4-Uniform loads 4.5-Line and strip loads 4.6-Unusual loads 4.7-Construction loads 4.8-Environmental factors 4.9-Factors of safety 4.10-Summary Chapter 5-Design of plain concrete slabs, pg. 360R-19 5.1-Introduction 5.2-Portland Cement Association (PCA) design method 5.3-Wire Reinforcement Institute (WRI) method 5.4-Corps of Engineers (COE) design method Chapter 6-Design of slabs with shrinkage and temperature reinforcement, pg. 360R-20 6.1-Introduction 6.2-Thickness design methods 6.3-Subgrade drag equation 6.4-Reinforcement location Chapter 7-Design of shrinkage-compensating concrete slabs, pg. 360R-21 7.1-Introduction 7.2-Thickness determination 7.3-Typical reinforcement conditions 7.4-Design implications 7.5-Maximum and minimum reinforcement requirements 7.6-Other considerations Chapter 8-Design of post-tensioned slabs on grade, pg. 360R-27 8.1-Notation 8.2-Definitions 8.3-Introduction 8.4-Applicable design procedures 8.5-Data needed for design of reinforced slabs 8.6-Design for slabs on expansive soils 8.7-Design for slabs on compressible soil 8.8-Maximum spacing of post-tensioning tendons in normal weight concrete Chapter 9-Reducing the effects of slab shrinkage and curling, pg. 360R-32 9.1-Introduction 9.2-Drying and thermal shrinkage 9.3-Curling and warping 9.4-Factors that affect shrinkage and curling 9.5-Compressive strength and shrinkage 9.6-Compressive strength and abrasion resistance 9.7-Removing restraints to shrinkage 9.8-Subgrade and vapor barriers 9.9-Distributed reinforcement to reduce curling and number of joints 9.l0-Thickened edges to reduce curling 9.11-Relation between curing and curling 9.12-Warping stresses in relation to joint spacing 9.13-Warping stresses and deformation 9.14-Effect of eliminating contraction joints with post-tensioning or shrinkage-compensating concrete 9.15-Summary and conclusions Chapter l0-References, pg. 360R-39 l0.1-Recommended references 10.2-Cited references pendix, pg. 360R-41 Al-Design examples using the PCA method A2-Slab thickness design by WRI method A3-Design examples using COE charts A4-Slab design using post-tensioning A5-Shrinkage-compensating concrete examples