29.5.4. Tie bars

Try these first

1. 1.

   What is the primary function of tie bars in concrete pavements?

   Hint

   Think about how they help slabs work together.

2. 2.

   What happens if tie bars are not properly placed?

   Hint

   Consider the consequences of loose connections.

3. 3.

   What is the primary role of tie bars in rigid pavements?

   • Transfer loads
   • Connect slabs
   • Allow expansion

   Hint

   Think about how slabs need to stay together.

4. 4.

   Tie bars should be hooked or deformed. True or False?

   • True
   • False

   Hint

   Consider the importance of a secure fit for performance.

5. 5.

   If a cement concrete pavement requires tie bars with a total steel area of 2.0 cm²/m and the allowable tensile stress is 1750 kg/cm², what would be the required diameter of the tie bars assuming a circular cross-section?

   Hint

   Remember to rearrange the area formula to solve for diameter.

6. 6.

   Consider a scenario where the bond stress for deformed bars increases to 30 kg/cm². Re-evaluate the length of a tie bar with a 1 cm diameter and 1750 kg/cm² allowable tensile stress. How would the increase in bond stress affect the length?

   Hint

   Reflect on how stronger bond stress influences the anchoring requirement.