🔍 Key Concepts

• Effect of angle of the shore on how much of the load is pure compression versus sideways (sliding) force at the ends • How friction at the deck and coaming resists slipping when the load is applied along the shore • Which arrangement gives a shorter, more vertical compression member, reducing the tendency to buckle

💭 Think About

• Look at the direction of the arrows: in which shore does the force line up more nearly with the length of the timber, so the timber is mostly in compression and not trying to slide? • At the deck contact point, which shore’s angle creates a larger sideways (shear) force that would make the foot want to slip instead of just pushing straight down? • If you had to choose the safer, recommended method for shoring against a hatch coaming, would you prefer a long, shallow angle shore or a shorter, steeper shore? Why?

✅ Before You Answer

• Compare the angle of shore A vs shore B relative to the deck and the direction of the arrows. • Decide in which case the load produces more downward (normal) force and less sideways sliding force at the deck contact. • Think about which shore is shorter and stiffer, and therefore less likely to buckle under a heavy compressive load.