Section 2 Scantling of Pillars

201. Sectional area of pillars

The sectional area of pillars is not to be less than that obtained from the following formula.

ŊĦËËĖ Ž (cm Ë)

JŶ

ËĦĒË G JÝ

Ŷ : length of pillar (m )

Ý : Minimum radius of gyration of pillar, obtained from the following formula (cm)

Ĭ

JÂ

Ý G JA

 : minimum moment of inertia of pillar (cmĖ )

A : sectional area of pillar (cm Ë)

Ž : deck load supported by pillar specified in 202. (ÝÀĤŶË )

202. Load supported by pillar

Load(Ž ) supported by pillar is not less than that obtained the following formula.

ÅẄY (ÝÀ)

Å : distance between the midpoints of two adjacent span of girders supported by the pillars the bulkhead stiffeners or bulkhead girders (m ) (see Fig 6.1)

Ẅ : distance between the midpoints of two adjacent span of girders supported by the pillars or

ner side of brackets (m ) (see Fig 6.1)

Y : deck load specified in Ch 4, 202. for the deck supported (ÝÀĤŶË)

or in-

203. Thickness of pillars

1. The thickness of tubular pillar is not to be less than that obtained from the However, this requirement may be suitably modified for the pillars provided spaces.

following formula. in accommodation

0.022 ẀỲ + 3.6 (mm)

Ch 6

ẀỲ : outside diameter of tubular pillar (mm )

2. The thickness of web and flange plates of built-up pillars is to be of sufficient for the prevention of local buckling.

204. Outside diameter of tubular pillars

The outside diameter of solid round pillars and tubular one is not to be less than 50 mm .

205. Pillars provided in deep tank

1. Pillars provided in deep tank are not to be of tubular one.

2. The sectional area of pillars is not to be less than that specified in 201. or that obtained from the following formula, whichever is the greater.

ËĦŊŊÅẄY

(cmË )

Å and Ẅ : specified in 202.

Y : 0.7 times the vertical distance from the top plate of deep tank to the point 2.0 m above the top of overflow pipe (m )