Muller Breslau's principle for obtaining influence lines is applicable to (i) Trusses (ii) Statically determinate beams and frames (iii) Statically indeterminate structures, the material of which is elastic and follows Hooke's law (iv) Any statically indeterminate structureThe correct answer is

Structural analysis is the process of calculating and determining the effects of loads and internal forces on a structure, building or object. It is also a branch of solid mechanics which uses simplified models for solids like bars, beams and shells for engineering decision making.