Design of RCC slab two way continuous supported

Elementary Structure Design

1. GOVERNMENT ENGINEERING COLLEGE, BHAVNAGAR. Civil Engineering Department

2. Elementary Structure Design TOPIC:- Design of R.C. Slab: two way continuous supported

3. 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

4. Introduction

5. 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

6. 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

7. Introduction

8. Typical Two Way slab

9. 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

10. 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

11. PROBLEM

12. THANK YOU FOR BEARING PRESENTED BY: Bhavik Shah – 130210106049 Digvijay Solanki – 130210106055 Kartik Hingol – 130210106030 Nitin Charel – 130210106011