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Published byYadira Kettell Modified about 1 year ago

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Check Beam Shear

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Bending moment design Short direction 245 166 2.5m

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Central band of short direction = 0.83 As = 0.83 (10.1)=8.6cm 2 Central band ratio =

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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 x2=6.2m x1=0.2m 800 kN 1200 kN x 2000kN A 800(0.2)+1200(6.2)=2000(x) x = 3.8m 2x =7.6 m 800 kN 1200 kN Try thickness =80cm

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Area required

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Check for punching Shear d = 730 mm A 1.13m 0.765

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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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Under Column B Shrinkage Reinforcement in short direction

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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 x1=0.2m x2=4.2 m 1200 kN 750 kN x 1950kN A 750(4.2)+1200(0.2)=1950 (x) x = 1.75m

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Area required

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Check for punching Shear h= 750mm d = 732 mm A B1=4m B2=1m

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B

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

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M max Empirical S.F.D & B.M.D m Convert trapezoidal load to rectangle 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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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 Assume L1=0.6 x1=5.2m 800 kN 1280 kN x 3040kN A 800(0.6)+1280(5.1)+960(10.6)= 3040 (x) x = 5.65m, 2(x)=11.3m L2=11.3 - (10.6)=0.7 960 kN x2=10.7m L2

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Check for punching Shear h = 700 mm d=630mm B Example You can check other columns

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Draw S.F.D & B.M.DStress 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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Modified load General Example, Ref. 2

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General reinforcement details

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