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ARCH5023/ARCH4343 -
ARCHITECTURAL STRUCTURES II
CONCRETE STRUCTURES
THE UNIVERSITY OF OKLAHOMA
- COLLEGE OF ARCHITECTURE
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TWO WAY SLAB
Design Methods
Analysis of 2-way slabs
=================
1. direct design method
2. equivalent frame method
The following methods
should be used when:
unusual geometric configurations
supports at irregular intervals
continuity of slab interrupted
3. finite analysis
4. model analysis
5. yield-line analysis
6. elastic continuum
Direct Design Method
The Direct Design Method
is based on the
moment distribution between
supports and midspan
the following conditions must apply
1. min 3 continuous spans
2. span to be similar length
max 1/3 length difference
3. live load to be uniform
< 3 * dead load
4. rectangular panels
long/short max 2.
5. 0.2
Equivalent Frame Method
Equivalent Frame Method:
====================
Applies if conditions for direct design method are not fulfilled.
Based on Interaction of slab and column
Pattern loading may be used
if live load exceeds 75% of dead load
Distinguish between
Exterior Column
Interior Column
Column stiffness coefficients
table 11.8
Value of torsion constant
table 11.9
Moment distribution factors for slab-beams
table 11.10
Moment distribution factors for slab-beams
with drop panels
table 11.11
Example Problem
CONCRETE FLOOR SLABS
ASSOCIATIONS
Other Related Topics
©Dr. Gruenwald 1996, 1997