two way slab example

two way slab example - 13.1 Two-way Slab EXAMPLES continued...

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13.1 Two-way Slab - EXAMPLES ... continued . Example #2: Consider the flat plate slab shown in the figure below. The slab has no exterior or internal beams. All the columns have dimensions of 450 mm x 450 mm . In addition to self-weight, the slab supports a superimposed dead load of 1 kPa and a live load of 3.6 kPa . c f ' = 30 MPa , y f = 400 MPa The engineer has chosen a slab thickness of 260 mm Use a cover of 20 mm and 15M bars. The E-W bars should be placed in the outer layer Flexure E-W (outer layer): d max = h s – cover – d b /2 = Flexure N-S (inner layer): d min = h s – cover – d b – d b /2 = Shear checks (use an average "d"): d average = (d max + d min )/2 = Specified (kPa) Specified loads (kPa) Factored loads (kPa) Dead load: Self-weight Dead load: Superimposed Live load
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13.1 Two-way Slab - EXAMPLES ... continued . Q1) Verify that the conditions for using the Direct Design method are met. .. Firstly is it a two-way slab or a one-way slab ? Conditions for Direct Design method (Lecture 12.1, p.10) There must be a minimum of three consecutive spans in each direction Successive spans in each direction shall not differ by more than one-third of the long span All loads must be due to gravity only and uniformly distributed The factored live load shall not exceed twice
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two way slab example - 13.1 Two-way Slab EXAMPLES continued...

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