In many structures the members are required to resist more than one kind of loading (combined loading). These can often be analyzed by superimposing the stresses and strains cause by each load acting separately. Superposition of stresses and strains is permissible only under the following conditions: a.The stresses and the strains must be a linear function of the applied loads (Hooke’s law must be obeyed and the displacements must be small). b.There must be no interaction between the various loads. COMBINED LOADS Examples: wide‐flange beam supported by a cable (combined bending and axial load), cylindrical pressure vessel supported as a beam, and shaft in combined torsion and bending.