12.1-a - Lecture 12.1 Two-way Slabs CSA A23.3 Clauses p 1...

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Lecture 12.1: Two-way Slabs – CSA A23.3 Clauses p. 1 Lecture 12.1: Two-way Slabs – CSA A23.3 Clauses p. 1 Lecture 12.1: Two-way Slabs CSA A23.3 Clauses Date: Tuesday March 31 st 2009 Lecture outline: Overview – Two-way slabs 1. Introduction 2. Two-way slab systems 3. Analysis techniques 4. Minimum Slab thickness Direct Design Method (extra handout given in class) 1. Moments using the Direct Design method 2. Unbalanced moments 3. Structural integrity reinforcement 4. Placement of flexural reinforcement 1. Introduction: Two-way slabs The two main requirements that must be met in the design of any floor system are: Strength Deflection control [Other requirements : vibration, fire resistance, acoustical properties, etc …] As seen in Lecture 3.2 and 10.2, reinforced concrete floor systems can be broadly classified in two main categories: One-way slab systems: o In one-way systems the load is transferred in primarily one direction o The primary reinforcement in each structural element runs in one direction only o Secondary/shrinkage reinforcement in other direction Two-way slab systems: o In two way systems the load is transferred in two directions o Therefore flexural reinforcement will run in both directions
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Lecture 12.1: Two-way Slabs – CSA A23.3 Clauses p. 2 Lecture 12.1: Two-way Slabs – CSA A23.3 Clauses p. 2 2. Two-way slab systems There are a number of different types of two-way floor systems. The choice of the system for a building will depend on the type of building application (loads, the spans between supports, etc…) and will largely be influenced by external factors such as economics, ease of construction and architectural considerations.
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