The maximum axial compressive load P
P = σ_{ac} x A where, P = axial compressive load (n)
σ_{ac} = permissible stress in axial compression (MPa)
A = grosssectional area of the member (mm^{2})
IS8001984 uses the Merchant Rankine formula for σ_{ac,} which is given as
Where, f_{cc} = elastic critical stress in compression =
λ = slenderness ratio = I/r
l = effective length of the compression member.
r = appropriate radius of gyration of the member (minimum value)
E = modulus of elasticity of steel = 2 x 10^{5} MPa
n = a factor assumed as 1.4
Maximum Slenderness Ratio (Clause 3.7.1 IS: 8001984)
Effective Length
Table: (Effective length of compression members of constant dimensions (Clause 5.2.2 IS: 8001984)
Angle struts
Table: Angle Struts (Clauses 5.5, IS: 800 – 1984)
Tacking Rivets
Design of Compression Members
The following steps are followed for designing an axially loaded compression member:
Lacings
1. General requirements
2. Design Specification
Battens
1. General Requirements:
2. Design Specifications:
(ii) For welded connections, Lap where t is the thickness of the plate
(iii) The total length of weld at the end of the edge of the batten
(iv) Length of weld at each edge of batten total length of weld required
(v) Return weld along the transverse axis of the column where t and D are the thickness and overall depth of the battens, respectively.
t = thickness of batten
Slab Base
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1. What are compression members in civil engineering? 
2. What are the types of compression members commonly used in civil engineering? 
3. What factors should be considered in the design of compression members? 
4. How are compression members designed to ensure their stability and safety? 
5. What are some common materials used for compression members in civil engineering? 

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