What is structural engineering and their types

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 In structural engineering, a structure is considered statically indeterminate when it cannot be analyzed using only the equations of equilibrium. The term "statically indeterminate" refers to a structure where the number of unknown support reactions or internal forces exceeds the number of available equilibrium equations.

Structural systems can be categorized based on their static determinacy:

1. Statically Determinate Structures:**

   - The number of unknowns (support reactions and internal forces) can be determined using the equations of equilibrium.

   - The structure is stable and can be analyzed solely through statics principles.


2. Statically Indeterminate Structures:**

   - The number of unknowns exceeds the number of equations available from static equilibrium.

   - Additional equations, such as compatibility equations or deformation compatibility, are needed for a complete analysis.


Statically indeterminate structures are common in engineering design, and their analysis often involves advanced techniques such as the flexibility method, the stiffness method, or the finite element method. These methods allow engineers to solve for unknowns and determine the internal forces and deformations in statically indeterminate structures.


The degree of static indeterminacy is quantified by the excess of unknowns over available equilibrium equations. Common types include beams with overhangs, continuous beams, and frames with redundant supports. Dealing with statically indeterminate structures requires a more sophisticated analysis approach compared to statically determinate structures.

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