Procedure 4-13 Design of Lug Supports

Q = vertical load per lug, lb Qa = axial load on gusset, lb Qb = bending load on gusset, lb n = number of gussets per lug Fa = allowable axial stress, psi Fb = allowable bending stress, psi fa = axial stress, psi fb = bending stress, psi 

Z = section modulus, in. w = uniform load on base plate, Ib/in. 

Ey = modulus of elasticity of vessel shell at design temperature, psi 

Es = modulus of elasticity of compression plate at design temperature, psi e = log base 2.71 Mb = bending moment, in.-lb 

K = spring constant or foundation modulus = damping factor 

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