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Job No. DT/18 DESIGN OF TWO-WAY SLAB (Limit State Method)

Data fck 30 N/mm2 Clear Cover 25 mm Load Factor 1.5

Panel Type 9Slab Thickness 220 mm Dead Load 5.5 KN/m2 Mod Span / deff 26

Short Span (lx) 4.570 m Live Load 2.00 KN/m2 Total Load 10.20

Long Span (ly) 8.210 m Finish Load 2.50 KN/m2 ly / lx 1.796

Span / deff 26 W/proof Load 0.20 KN/m2 Effective Span 4.760

Proceed with design

Rebars: fy & Dia 415 10 415 8 415 8

Spacing (Strength) 147 mm c/c 165 mm c/c mm c/c

(Deflection) 147 mm c/c

(IS 456) 297 mm c/c 190 mm c/c 190 mm c/c

Critical spacing 147 mm c/c 165 mm c/c 190 mm c/c

Provide spacing mm c/c mm c/c mm c/c

Strength aspects

Effective depth 190.0 mm 181.0 mm 191.0 mm

Coeff. Alpha 0.101 0.056 0.000

Ultimate BM 35.117 KNm/m 19.413 KNm/m 0.000 KNm/m

xu / d 0.094 0.056 0.000

xumax / d 0.479 0.479 0.479

Reinforcement 0.280 % 0.168 % 0.000 %

Area of bars 5.33 cm2/m 3.04 cm2/m 0.00 cm2/m

Deflection aspects

Service Stress 240.7 N/mm2

Allowable Span/ deff 39.70 >= 24.05

Reinforcement 0.280 %

Area of bars 5.33 cm2/m

IS 456 guid elines

Reinforcement 0.12 % 0.12 % 0.12 %

Spacing of bars 297.5 mm c/c 190.4 mm c/c 190.4 mm c/c

Max Spacing 297.5 mm c/c 190.4 mm c/c 190.4 mm c/c

Working Loads Design Parameters

Short Bars at Bottom Long Bars at Bottom Short Bars at Support

Design

New Slab

Application: TWSlabDesign.xls Developed by : Umesh Dhargalkar

8/13/2019 Tw Slab Design

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DESIGN OF S.S. TWO-WAY SLAB (Limit State Method)

1. This application can be used for designing two-way slabs as per Table 26, IS-456: 2000

2. Cells with yellow fill are for data input.

3. Data should be entered in specified units only.

Notes

Steps for use

1. Enter required data: Materials, panel type, slab dimensions and loads.2. Enter first choice for reinforcement at bottom and top3. If "Proceed with design" message appears, click Design button, else revise slab

thickness or grade of reinforcement.4. For bars at bottom (short and long) as well bars at top (short and long), the

spacing required from the aspects of strength, deflection and provisions of IS

456 are displayed. Critical spacing is also displayed.5. Choose spacing based on the displayed values, else change the slab thickness or

grade of reinforcement and take more trials.

6. To proceed to the next slab, click New Slab button and repeat the above steps.

Appl icat ion: TWSlabDesign.xls Developed by: Umesh Dhargalkar