The strength of a structure or a system is often associated to the maximum static load which it can withstands, according to the relevant standard (extreme design load which can be encountered). This means that the corresponding validation of the design requires to perform** static calculations**, assuming usually a linear elastic constitutive model of the material. The results of calculations (in particular the values of stresses) are compared to the limits specified in the standard.

In fact, the check of the “strength”, in the broad sense of the term, include to perform some other investigations because the failure of a structure does not occur systematically when the stress values exceeds the allowable limit. It may occur for instance due to buckling (ex: structural instability of slender structures). As an example, the buckling check of stiffened panels on ship structures is systematically performed as per required by the applicable standards.

The **global buckling** of the structure is also to be checked, if relevant. It is more realistic to speak about “ultimate strength” instead, because it corresponds to the global collapse of the structure involving large plastic deformations and collapse mechanisms. Assessment of** ultimate strength** is the only way to get the real safety coefficient regarding collapse associated to a given loading pattern.

The strength of a structure in particular conditions may also depend on the fact that the mechanical characteristics of the material are degraded by a temperature increase (for instance in case of fire). This situation can be assessed by performing **thermal / thermo mechanical analyses**.

* Tecnitas *experience in all the above described checks and assessments constitute a solid basis for proposing customized services depending on the situation.

The following typical items are usual activities performed by * Tecnitas* :

- Static Calculations,
- Buckling and Ultimate Strength,
- Structural Analysis of Composite and Bonded Structures,
- Thermal and Thermo Mechanical Analyses.

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