This document provides information about the Structural Analysis-I course CEE-311. It includes details about the course instructor, textbook references, evaluation criteria, and topics that will be covered such as truss analysis, influence lines, and structural stability and determinacy. Key concepts that will be discussed are the definitions of what constitutes a structure, and structural analysis which is a detailed evaluation to ensure structural failure will not occur under allowable deformations. Common structural forms such as beams, columns, frames, trusses, plates and shells as well as composite structures will also be examined.

1. CEE-311
Structural Analysis-I
(3.0 credit)
Lecture: 1
Bijit Kumar Banik
Assistant Professor, CEE, SUST
Room No.: 115 (“C” building)
bijit_sustbd@yahoo.com
Department of Civil and Environmental Engineering

2. Truss Analysis
Syllabus
Influence Line (IL)
Moving Concentric Load

3. Attendance 10%
Evaluation process
Final Exam 70%
Total 100%
Class performance 20%

4. 1. Theory of Simple Structures
– Sheed & Vawter
References
2. Elementary Structural Analysis
– Norris, Wilbur & Utku
3. Structural Analysis
– Hibler

5. What is Structure?
Structure is something that is built or constructed
and designed to sustain load.
Ex. Bridge or Building

6. What is Structural Analysis?
A detailed evaluation intended to assure that, the
deformations will be sufficiently below allowable values
that structural failure will not occur.

7. Roller
Supports
Hinge
Fixed
Pin (for one member)

8. Common Structural Form
Beam:
Column:
Frame:
Truss:
Plate:
Shell:
Composite Structures:
Primarily subjected to bending
Primarily subjected to axial compression
Combination of Beam & Column
Only subjected to axial forces
Composed of planer flat or sheet
like elements. Ex-Slab
If the sheet like elements are
curved rather than line elements.
Ex-Dome
Truss + Bridge

9. Stability and Determinacy
Beam
No of unknown > No. of known equations
Statically indeterminate beam
No of unknown ≤ No. of known equations
Statically determinate beam
(No of unknown - No. of known equations)
Degree of Indeterminacy (DOI)

10. Stability and Determinacy
Example
Statically determinate
DOI = 0
Stable
Statically indeterminate
DOI = 1
Stable

11. Stability and Determinacy
Statically determinate
DOI = 0
Unstable Equilibrium
Statically determinate
DOI = -1
Unstable Equilibrium
Unstable Equilibrium: Stable under specific types of
loading but unstable under general types of loading

12. Stability and Determinacy
Statically indeterminate
DOI = 0
Geometrically Unstable
Statically indeterminate
DOI = 0
Geometrically Unstable
Geometrically Unstable: If reaction elements are
concurrent or parallel, even there are three or more
reaction elements, they are geometrically unstable.
When a structure is geometrically unstable it becomes indeterminate
So, stability of a structure is determined not only by the no. of reaction
elements but also their arrangement.

13. Stability and Determinacy
1. No of unknown < No. of known equations
Statically determinate, unstable or possibly
in unstable equilibrium
3. No of unknown > No. of known equations
Statically indeterminate , stable (unless
geometric instability is possible)
2. No of unknown = No. of known equations
Statically determinate and stable unless
geometric instability is possible