1 Pillars and Girders

2 Pillars also referred to as: –posts –stanchions –columns

3 Pillars give vertical support to: –girders (fore and aft members) –deck beams –decks –heavy concentrated loads ground tackle –anchor windlass –line handling winches –capstans

4 Pillars assume the load –transmit load downward toward the bottom of the hull where the load can be distributed over a large area

5 Use of Pillars when placed under a deck beam or girder: –reduces the deflection of the deck beam or girder reduces span of beam –relieves stress on beam brackets and transverse frames

6 Non Pillared vessel notice deflection of deck beam notice shape of unpillared vessel

7 Pillared Vessel notice shape of supported deck beam –additionally stress on beam brackets is reduced

8 Pillars act as tension members act as compression members (add weight on deck below main deck)

9 Notice Increase In Pillar Size also notice that pillars are in line with one another

10 Pillars pillars are –in line –increase in cross sectional area deeper down inside the vessel

11 pillars are usually circular in shape and either solid or hollow may be H or I beam (usually used in E/R not cargo holds) –top of pillar: head –bottom of pillar: heel

12

13 Girders heavy fore and aft members girders are slotted allowing the deck beam to pass through

14 With and Without Girders

15 Ideal Depth of Beam Brackets 2 and 1/2 times depth of beam