Design of RCC slab two way continuous supported

GOVERNMENT ENGINEERING COLLEGE,
BHAVNAGAR.
Civil Engineering Department

ELEMENTARY STRUCTURE DESIGN
• TOPIC:-
•Design of R.C. Slab: two way
continuous supported

INTRODUCTION
• Slabs could be simply supported, continuous or cantilever
• In two way slab the corners may be held down by restraints or may
be allowed to lift up
• Additional torsion reinforcement is required at corners when it is
restrained against uplifting as shown in Fig

INTRODUCTION
• Thickness of the slab is decided based on span to depth ratio specified in IS456-
2000. Min reinforcement is 0.12% for HYSD bars and 0.15 % for mild steel bars.
• The maximum diameter of bar used in slab should not exceed 1/8 of the total
thickness of slab
• Maximum spacing of main bar is restricted to 3 times effective depth or 300 mm
which ever is less
• For distribution bars the maximum spacing is specified as 5 times the effective
depth or 450 mm which ever is less

INTRODUCTION
• Generally 15 mm to 20 mm cover is provided for the main
reinforcements
• Alternate main bars can be cranked near support or could be bent
at 1800 at the edge and then extended at the top inside the slab as
shown in Fig
• Curtailment and cranking of bars and is shown in Fig

PROBLEM
• Prepare a detailed structural drawing of one way continuous slab for a hall of clear dimensions 7m wide and
11.77 m long, use following data
• Centre to centre distance of supporting beams = 3.0 m
• Span of the beams = 7.23m
• Beams are supported on walls of 0.23 m thickness
• C/s of beam = 230 x 450 mm
• Grade of concrete : M20
• Type of steel : Fe415
• Clear cover : 20 mm
• Slab thickness: 150 mm
• Beam depth is inclusive of slab depth, The hall is having walls on all 4 sides

TYPICAL TWO WAY SLAB
• Main positive reinforcement @ end span = 8mm diameter
@100 c/c
• Main reinforcement in other interior panels = 8 mm diameter
@ 200 c/c
• Negative reinforcement @ all supports = 8mm diameter @
200 c/c
• Distribution steel= 8mm diameter @ 200 c/c

THANK YOU FOR
BEARING
BHAVIK SHAH – 130210106049
DIGVIJAY SOLANKI – 130210106055
KARTIK HINGOL – 130210106030
NITIN CHAREL – 130210106011

Design of RCC slab two way continuous supported

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