1. CE 203:Structural Mechanics Week # 1

2. Policy • Get to know each other • Things to know about instructor policy • Grading

3. What is structural mechanics? • Calculation of stresses i.e. relation with external loads • Calculating deformations • Evaluating structure stability

4. What are the important steps in structural design? • Determine internal forces from statics • Know how the material behaves • Now determine required size, deflections and stability of structural members

5. Types of forces • External forces : can be surface or body • Reactions • Internal

6. Calculate internal forces at point C.

7. Calculate internal forces at point C.

8. Calculate the force in member AC.Given P= 200 kN

9. Can we calculate the stress in AC • What about at B? • What about the bolts? • What are the different types of stresses that we see here?

10. Concept of stress • Definition of average normal stress • Definition of average shear stress • Concept of allowable stress and safety factor

11. Calculate the normal stress at point A. X-sectional area of I-beam is

12. Shear stress

13. Shear stress