29.4. Combination of stresses

Try these first

1. 1.

   What is the formula for critical stress during summer?

   Hint

   Recall the components we discussed in class.

2. 2.

   Name a critical load position in rigid pavements.

   Hint

   Think of the areas where loads can apply.

3. 3.

   What does C3 ext{ critical}E include during summer?

   • Only friction stress
   • Heat and friction stress
   • Edge
   • temperature and friction stress

   Hint

   Remember the acronym ETC!

4. 4.

   True or False: Corner stress is the least critical factor for pavement design.

   • True
   • False

   Hint

   Think about which areas are under maximum pressure.

5. 5.

   Calculate the total critical stress for a rigid pavement if the edge stress is 150 kg/cm², temperature stress is 45 kg/cm², and frictional stress is 20 kg/cm² under summer conditions.

   Hint

   Add all the stress components together as we discussed.

6. 6.

   Discuss the long-term implications of fluctuating temperature on stress in rigid pavements for urban areas.

   Hint

   Think about how constant changes could lead to material failures.