1 Analysis of Test Results

2 What we’ll have to do: Load-Deflection curve. Load Vs Strain curve for steel and concrete Find yield load (  s = 0.002) for flexural rebar and strain at failure load for concrete and rebar. First yield load for flexural reinforcement. Ductility of the slab. Energy absorption. Deflection profile.

3 Calculate flexural strength and Punching shear capacity of the slab. Compare test result with predicted result. Show a photograph depicting the crack pattern at failure. Make comment on the mode of failure of the slab.

4 Tension Reinforcement and Strain gauges arrangement T1(1050,845);T2(1260,1020);T3(1460,845);T4(1590,1020);T5(810,1080) T1 T2 T3 T4 T5 1900

5 Compression Reinforcement and Strain gauges arrangement C6(820,770); C7(1090,820); C8(820,580); C9(820,400) C9 C8 C7 C6

6 Concrete Strain gauge locations , 70, 100, 100

7 Load-Deflection curve

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10 Load vs Strain curve for steel and concrete

11 Load vs Strain curve for steel and concrete

12 Load vs Strain curve for steel and concrete

13 Load vs Strain curve for steel and concrete

14 Load vs Strain curve for steel and concrete

15 Load vs Strain curve for steel and concrete

16 Steel Strain Distribution 100 KN 150 KN 200 KN

17 Concrete Strain Distribution 50 KN 100 KN 150 KN 200 KN

18 Find yield load (  s = 0.002) for flexural rebar and strain at failure load for concrete and rebar. First yield load for flexural reinforcement.

19 Ductility and Energy Absorption of the Slab Ductility = Ratio of the deflection at 25% of maximum load (after reaching the maximum load) to the deflection at the first yielding of flexural reinforcement. Energy Absorption = Area under the load deflection curve up to 25 % maximum load (after reaching the maximum load)

20 Ductility and Energy Absorption of the Slab

21 Deflection Profile 1 division = 0.01 mm 1 cycle = 1 mm

22 Calculation of Flexural strength

23 Calculation of Punching Shear Capacity

24 Compare Test result with Predicted result P flex PvPv P pred. P test P test /P pred.

25 Show a photograph depicting the crack pattern at failure and Make comment on the mode of failure of the slab If   1, Flexural failure If   1, Punching Shear failure   From crack pattern Make comment on mode of failure