7.1. Arches

Try these first

1. 1.

   What is the primary mechanism of load bearing in arches?

   Hint

   Think about how weight is distributed across the structure.

2. 2.

   List one advantage of using an arch compared to a beam.

   Hint

   Consider the materials needed for beams.

3. 3.

   What is the main advantage of arches over beams?

   • They resist tensile forces
   • They resist compression only
   • They are lighter

   Hint

   Remember the efficiency of material use.

4. 4.

   True or False: A parabolic arch experiencing uniform loading will have bending moments.

   • True
   • False

   Hint

   Consider how different shapes respond to loads.

5. 5.

   A three-hinged arch spans 80 feet with a rise of 20 feet. If a uniform load of 300 lbs/ft is applied, calculate the horizontal thrust at the supports. Assume the arch is parabolic.

   Hint

   Break down the formula components to ensure clarity.

6. 6.

   Construct the moment diagram for a three-hinged arch subjected to a varying load distributed across its length.

   Hint

   Focus on equilibrium principles and stress distribution to guide diagram construction.