7. INTERNAL FORCES IN STRUCTURES

Try these first

1. 1.

   What type of load do arches primarily transmit?

   Hint

   Think about how cables work since arches are similar.

2. 2.

   Name one benefit of using a three-hinged arch.

   Hint

   Consider stability in structures.

3. 3.

   What type of stress do arches primarily deal with?

   • Tensile
   • Shear
   • Compressive

   Hint

   Remember, arches are like inverted cables.

4. 4.

   True or False: A three-hinged arch can experience bending moments at supports.

   • True
   • False

   Hint

   Think about how hinges affect structural behavior.

5. 5.

   Design a two-hinged arch for a bridge, ensuring it can withstand asymmetric loads. Discuss how you'll determine the necessary dimensions and materials.

   Hint

   Start by sketching a moment diagram to visualize forces.

6. 6.

   Analyze the potential failure modes of a semi-circular arch under varying live loads. What design principles would you employ to mitigate these risks?

   Hint

   Look at how varying loads can shift the center of gravity.