1. LECTURE #1
Book Overview
Read Chapt. 1(skip sect. 1.9)
Chapter 2 - Design Loads
Skip Chapter 3- Lateral Forces
Chapter 4- Wood Properties

2. LECTURE # 1 COURSE OVERVIEW
Owner Retains Architectural/ Engineering Design Firm
Design firm Produces a Drawing to meet Owner’s Objectives and Goals
Iterative Process for Design Aims Towards an Optimum Solution (Cost, Efficiency, Life Cycle Costing)
Final Decision is made and Job Bidding Begins

3. Iterative Procedure
Planning - establish the various functions of the structure
Preliminary Configuration of Structure - arrange the structural elements of the bldg.
Model Loads - establish loading pattern (ex. LL,DL, etc)
Preliminary Member Selection - Based on elements and loads to meet planned function
Structural Analysis - perform a detail analysis of each member
Refine member design - refine design based on adequacy, strength, and services of the G.C.
Evaluation and Redesign - Has Optimum Solution been Achieved?

4. LECTURE # 1(contd...)
(CET 331)
Designing the loads begin from the top of the proposed structure
Stresses can be calculated in each member based on the tributary loading
Selection of material is based on the actual stresses
The entire structural system is analyzed for lateral forces (wind & seismic)
(CET 411)
Cost of the structure is evaluated

5. Centroids, Moments of Inertia,Radius of Gyration, and Section Modulus
Parallel Axis Theorem -is the summation
of the moments of inertia for for composite Areas
Section Modulus – most useful property for designing beams
S = I/c
where c is the distance to the extreme fiber from the neutral axis
Radius of Gyration – is useful for comparative
purposes but has no physical significance

6. Centroids, Moments of Inertia, Radius of Gyration, and Section Modulus
Centroid of an Area – Is the first moment (Center of Gravity)
The centroid of an area can be considered to be the point where
the area is concentrated
Moment of Inertia – Is the second moment
x datum y x x y c
y datum

7. INTRODUCTION TO CET331
WHAT KNOWLEDGE BASE SHOULD WE UNDERSTAND TO HANDLE TIMBER AND MASONRY DESIGN?
STRENGTHS OF MATERIALS
STEEL AND CONCRETE DESIGN
WHAT PARAMETERS AND PROPERTIES IN STRENGTH OF MATERIAL IS USEFUL FOR THIS COURSE?
PARAMETERS(INCLUDE):
AREA AND CENTER OF GRAVITY
MOMENT OF INERTIA
SECTION MODULUS AND RADIUS OF
GYRATION

8. HOW IS THE USE OF THIS MATERIAL GOVERNED??
MODEL CODES - BOCA, UBC, SBC
IBC 2000 IS HERE!!!
ASTM & ACI (STANDARDS FOUND IN THE TEXT BOOK)
AISC & ASSHTO (OTHER STANDARDS)
STRENGTH OF MATERIAL REVIEW
COMPRESSION
TENSION
TORSION
THIRD POINT LOADING

9. SAMPLE DEFLECTION PROBLEM
A steel bar 4 sq. inches. in area is used to support a gravity load in building construction. If 1 foot of the bar is hanging vertically, and a load of lbs is being supported at the lower of the bar, determine the total elongation of the bar. (neglecting its own weight)

10. GENERAL DEFORMATION EQUATION
Mild steel :

11. Uniformly distributed load
Static of Simple Structures
Concentrated Load
Uniformly distributed load
Regular varying load
Statically indeterminate structure is a structure that reactions cannot be computed from the equation of static equilibrium