Upload
donald-sims
View
221
Download
0
Tags:
Embed Size (px)
Citation preview
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 Sizealso 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