The document discusses the moment coefficient method for analyzing statically indeterminate structures. It provides definitions of statically indeterminate structures as those where there are more unknown reactions or internal forces than available equilibrium equations. The moment coefficient method uses coefficients provided in the ACI code that are based on elastic analysis but account for inelastic redistribution. The coefficients are multiplied by the total factored load and span length to determine bending moments. The method was first included in the 1963 ACI code and remains permissible for analyzing two-way slabs supported on all sides. Advantages include providing a more exact analysis and potential cost savings through more precise design.

1. Solving Statically Indeterminate
Structure: Moment Coefficient Method
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CE-416
Pre-stressed Concrete Lab Sessional
Presented By:
Yousuf Bin Aziz
Id No:10.01.03.018
Course teachers:
Munshi Galib Muktadir
Sabreena Nasrin
Department Of Civil Engineering
Ahsanullah University of Science &
technology 12/1/2013

2. Definition Of Indeterminate
Structure
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
A structure of any type is classified as
statically indeterminate when the number of
unknown reaction or internal forces exceeds
the number of equilibrium equations available
for its analysis. Most of structures are statically
indeterminate

For example, reinforced concrete buildings
are almost always statically indeterminate.
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3. Moment Coefficient Method
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The ACI Code provides tables of moment
coefficient
for a variety of conditions. These coefficients
are based on elastic analysis but also account
for inelastic redistribution.
 The expressions for moment take the form of
coefficient multiplied by total factored load per
unit length on the span & the length of the
clear span.

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4. History Of Moment Coefficient
Method
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

The Moment Coefficient Method included for the
first time in 1963 ACI Code is applicable to twoway slabs supported on four sides of each slab
panel by walls, steel beams.
Although, not included in 1977 and later versions
of ACI code,its continued use is permissible under
the ACI 318-08 code provision (13.5.1). Visit ACI
13.5.1.relatively deep, stiff, edge beams.
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5. Advantage
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


The coefficients give more exact analysis.
Significant economy can be achieved by making a
more precise analysis.
There should be no reversal of moments at the
critical design sections near midspan or at the
support faces.
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6. Moment Coefficient Method: Cases
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7. Moment Coefficient Method: Cases
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8. Moment Coefficient Method: Cases
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9. 9
ACI Moment Coefficient For Two Way
Slab
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10. Moment Coefficient Method
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11. Moment Coefficient Method
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12. Moment Coefficient Method
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13. Moment Coefficient Method
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14. Moment Coefficient Method
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15. Design Of One-Way SlabMoment
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16. 16
Design Of One-Way SlabMoment
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17. Limitation of One-Way Slab
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18. 18
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