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Base Plate Design Gangway Column

The document summarizes the design of a base plate and anchor bolts for a column. It calculates: 1) The base plate should be 700mm x 500mm x 32mm thick to support the maximum moment of 30249099 Nmm. 2) Four 20mm diameter anchor bolts per side are required, with a length of 100mm, to support the 1.7kN load on each side of the base plate. 3) All requirements for the base plate and anchor bolt sizes are satisfied based on the load calculations.

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sandeep
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161 views2 pages

Base Plate Design Gangway Column

The document summarizes the design of a base plate and anchor bolts for a column. It calculates: 1) The base plate should be 700mm x 500mm x 32mm thick to support the maximum moment of 30249099 Nmm. 2) Four 20mm diameter anchor bolts per side are required, with a length of 100mm, to support the 1.7kN load on each side of the base plate. 3) All requirements for the base plate and anchor bolt sizes are satisfied based on the load calculations.

Uploaded by

sandeep
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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DESIGN OF BASE PLATE AND ANCHOR BOLT

MAX MOMENT Mz = 1.7 KNm


CORRESPONDING FY = 390 KN

BASE PLATE DESIGN


LENGTH (L) WIDTH (B)
SIZE OF BASE PLATE 700 X 500

ECCENTRICITY e=M/P 4.358974 mm

CASE 1 e<L/6 CASE 2 L/6<e<L/3 CASE 3 e>L/3

HERE OUR CASE IS CASE 1


WIDTH OF COLUMN = 332
a = 272
c = 184

c= 184 332

Tb `

a= 272
78

700

0.5
X= L/2+a - (L/2 + a)2 - {2 x(M +P a) = 26.22388 mm
0.45 fck B
MOMENT CAPACITY OF BASE PLATE

Md = 1.2 X fy x Ze
Ƴmo
fck = 30
Fy = 250
Ze = BxTb2 = 83.33333333 xTb2
6
Ƴmo = 1.1

Md = 22727 xTb2

max moment = 0.45 * fck *X * B (c-x/2)


= 30249099 Nmm

THICKNESS OF BASE PLATE (30249099/22727)^0.5 36.48255 mm

THERFOR BASE PLATE 700X X 500X32 mm THICK WITH CLEAT ANGLE 150X150X16 mm is provided.

DESIGN OF ANCHOR BOLT

LOAD ON ANCHOR BOLT (each side)_ =1.7/(2x0.272) KNm


= 3.125 KN
= 0.319 t

DIA OF BOLT = 20 mm
NET AREA OF BOLT = 245.04
PERMISSIBLE SHEAR STRESS = 0.4*Fy 100 N/mm2
= 1000 KG/cm2
STRENGTH OF ONE BOLT = 1000X2.4504 KG
= 2450.4 KG
= 2.4504 t
NO. OF BOLT EACH SIDE = 0.319/2.4504
= 0.130182827 No.

TOTAL NO. OF BOLT PROVIDED = 4

LENGTH OF ANCHOR BOLT

LOAD ON ONE BOLT = LOAD ON EACH SIDE OF PLATE


NO OF BOLT ON EACH SIDE

= 1.5625 KN
BOND STRESS OF CONCRETE 1.4 N/mm2

length of bolt = 1.5625*1000/(22/7*20*1.4)


= 17.76283 mm

provide length of bolt = 100 mm

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