12.3 - Lecture 12.2: Two-way Slabs CSA A23.3 Clauses...

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Lecture 12.2: Two-way Slabs – CSA A23.3 Clauses related to shear p. 1 Lecture 12.1: Two-way Slabs – CSA A23.3 Clauses related to shear p. 1 Lecture 12.2: Two-way Slabs CSA A23.3 Clauses related to shear Date: Thursday April 2 nd 2009 Lecture outline: 1. Shear mechanisms: two-way slabs 2. Design for two-way shear (edge columns, interior columns) 3. Design for shear (corner columns) 4. CSA A23.3 Clauses: Two-way shear and One-way shear 1. Shear mechanisms – two way slabs Two-way slabs (just like footings) are susceptible to two types of shear mechanisms: One-way shear: (sometimes called beam action shear) where there is an inclined crack extending across the entire width of the structure. Two-way shear: (sometimes called punching shear) where a failure occurs across a truncated cone surface around the column The two mechanisms are illustrated in the figures below:
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Lecture 12.2: Two-way Slabs – CSA A23.3 Clauses related to shear p. 2 Lecture 12.1: Two-way Slabs – CSA A23.3 Clauses related to shear p. 2 An example of a punching shear failure in a parking garage slab is shown below:
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Lecture 12.2: Two-way Slabs – CSA A23.3 Clauses related to shear p. 3 Lecture 12.1: Two-way Slabs – CSA A23.3 Clauses related to shear p. 3 The critical sections used in the one-way shear and two-shear calculations are illustrated in the figure below: Critical sections for two-shear for various column shapes (shown for interior columns):
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Lecture 12.2: Two-way Slabs – CSA A23.3 Clauses related to shear p. 4 Lecture 12.1: Two-way Slabs – CSA A23.3 Clauses related to shear p. 4 2. Design for two-way shear (edge columns, interior columns) As seen previously in footing design, two-way shear is approximated to be critical on a vertical section through the slab and extending around the column. Clause 13.3.3.1
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This note was uploaded on 04/19/2011 for the course CIVE 463 taught by Professor Mirza during the Winter '10 term at McGill.

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12.3 - Lecture 12.2: Two-way Slabs CSA A23.3 Clauses...

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