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Check Beam Shear

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Bending moment design 2.5m 245 166 Short direction

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Central band ratio = Central band of short direction = 0.83 As = 0.83 (10.1)=8.6cm2

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Footing Design Part II Combined footing

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Example 1 Design a combined footing As shown

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**Dimension calculation **

The base dimension to get uniform distributed load 2000kN 800 kN 1200 kN A x1=0.2m x2=6.2m x 800(0.2)+1200(6.2)=2000(x) x = 3.8m 800 kN 1200 kN Try thickness =80cm 2x =7.6 m

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Area required

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**Check for punching Shear**

d = 730 mm 1.13m 0.765 A

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B

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Draw S.F.D & B.M.D Stress under footing = 190 *1.8 = 342 kN/m

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Check for beam shear b = 1800mm, d = 730mm

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**Bending moment Long direction**

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**Bending moment Short direction**

Under Column A

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**Shrinkage Reinforcement in short direction**

Under Column B Shrinkage Reinforcement in short direction

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**Combined footing, strip footing, & Mat foundation**

Footing Design Part III Combined footing, strip footing, & Mat foundation

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Example 2 Design a combined footing As shown

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**Dimension calculation **

The base dimension to get uniform distributed load x2=4.2m 1200 kN 750 kN x 1950kN A 750(4.2)+1200(0.2)=1950 (x) x = 1.75m x1=0.2m

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Area required

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**Check for punching Shear**

h= 750mm d = 732 mm A B2=1m B1=4m

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B

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Draw S.F.D & B.M.D

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**Empirical S.F.D & B.M.D m Convert trapezoidal load to rectangle Mmax**

Clear distance between column B in moment design = ave. width = 2.5m

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Check for beam shear d = 665mm Y=1.5m 1m 4m x b

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**Bending moment Long direction**

Top Bottom

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**Bending moment Short direction**

Under Column A

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**Shrinkage Reinforcement in short direction**

Under Column B Shrinkage Reinforcement in short direction

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**Reinforcement details**

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**Example 3 (Strip footing)**

Design a combined footing As shown

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**Dimension calculation **

The base dimension to get uniform distributed load 3040kN 800 kN 1280 kN 960 kN A Assume L1=0.6 x1=5.2m L2 x2=10.7m x 800(0.6)+1280(5.1)+960(10.6)= 3040 (x) x = 5.65m, 2(x)=11.3m L2= (10.6)=0.7

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**B Check for punching Shear h = 700 mm d=630mm Example**

You can check other columns

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Draw S.F.D & B.M.D Stress under footing = 195 *1.8 = 351 kN/m

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Check for beam shear b = 1800mm, d = 630mm

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**Bending moment Long direction**

Design Short direction as example 1 (lecture 11)

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**Reinforcement details**

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Mat Foundation

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**Check for punching Shear**

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General Example, Ref. 2 Modified load

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**General reinforcement details**

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