CHAPTER 7:
ANALYSIS
OF TWO-
WAY SLAB
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Analysis of Two-Way Slab, Slides of Reinforced Concrete Design
A detailed analysis and design guidelines for two-way slabs, which are supported by beams and columns on all four edges and experience bending in both directions. It covers key topics such as column and middle strips, minimum slab thickness, minimum flexural reinforcement, flexural reinforcement spacing, and the direct design method (ddm) for calculating factored moments and shear. The document also includes example problems to illustrate the application of these principles. This comprehensive guide is valuable for civil engineering students, professionals, and researchers working on the design and analysis of two-way slab systems in building construction.
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2023/2024
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CHAPTER 7:
ANALYSIS
OF TWO-
WAY SLAB
TOPIC GUIDELINES
INTRODUCTION
1
ANALYSIS AND DESIGN OF TWO-WAY SLAB
2
2.1 COLUMN AND MIDDLE STRIPS (408.4.1.5-7)
2.2 MINIMUM SLAB THICKNESS (408.3.1)
2.3 MINIMUM FLEXURAL REINFORCEMENT IN
NON-PRESTRESSED TWO-WAY SLAB (408.6.1)
2.4 FLEXURAL REINFORCEMENT SPACING (408.7.2)
NOTATIONS AND SYMBOLS f’c (^) = specified compressive stress of concrete, MPa = specified yield strength of steel, MPa = width of compression face of member, mm = distance from extreme compression fiber to centroid of tension reinforcement, mm = total slab thickness, mm = spacing of bar, mm = diameter of bar, mm = diameter of aggregates, mm d fy b d h s = area of bar, mm A (^) bar A s = required area of steel, mm = minimum area of steel, mm = gross concrete area, mm b d^ agg 2 2 A s min 2 A g^ 2 = steel reinforcement ratio = minimum steel reinforcement ratio ρ min ρ = factored uniform load, kN/m = uniform service dead laod wu w D = uniform service live load wL
TWO-WAY SLAB INTRODUCTION 1 a slab that is supported by beams and columns on all four edges. The bending is in both directions.
ANALYSIS AND DESIGN OF TWO-WAY SLAB 2 2.1 COLUMN AND MIDDLE STRIPS (408.4.1.5-7) the purpose of column strip and middle strip is to simplify the design and distribution of loads across the slab
ANALYSIS AND DESIGN OF TWO-WAY SLAB 2.2 MINIMUM SLAB THICKNESS (408.3.1)
2.3 MINIMUM FLEXURAL REINFORCEMENT IN NON-PRESTRESSED TWO-WAY SLAB (408.6.1) ANALYSIS AND DESIGN OF TWO-WAY SLAB
2.4 FLEXURAL REINFORCEMENT SPACING (408.7.2) ANALYSIS AND DESIGN OF TWO-WAY SLAB
DIRECT DESIGN METHOD (DDM)
3.2 TOTAL FACTORED STATIC MOMENT FOR A SPAN (408.10.3) DIRECT DESIGN METHOD (DDM)
3.4 FACTORED MOMENT IN COLUMN STRIPS (408.10.5) DIRECT DESIGN METHOD (DDM)
DIRECT DESIGN METHOD (DDM)
3.6 FACTORED MOMENT IN MIDDLE STRIPS (408.10.6) DIRECT DESIGN METHOD (DDM)
3.7 FACTORED SHEAR IN SLAB SYSTEM WITH BEAMS (408.10.8) DIRECT DESIGN METHOD (DDM)