2.1. Stress-Strain Curve in Compression

Try these first

1. 1.

   What does the initial linear portion of the stress-strain curve represent?

   Hint

   Think about how materials usually respond to loads.

2. 2.

   Define ultimate compressive strength.

   Hint

   What is the key limit we assess in concrete design?

3. 3.

   What is the general shape of the stress-strain curve in compression?

   • Linear throughout
   • Linear then non-linear
   • Constant

   Hint

   Think about how materials typically respond to loads.

4. 4.

   True or False: The ultimate compressive strength is the only factor we consider for concrete performance.

   • True
   • False

   Hint

   Examine if there are other variables involved.

5. 5.

   Given a concrete column with a known Modulus of Elasticity, calculate the expected stress at a strain of 0.0025. The ultimate compressive strength is 30 MPa.

   Hint

   You will need to use concrete's characteristics to plug values into the modulus equation.

6. 6.

   Analyze the potential failure mechanism in a structure designed with lower than necessary ultimate compressive strength. What consequences might arise?

   Hint

   Consider the implications of inadequate material strength on structural safety.