User:L.menocal

=hyperstatic analysis II=

Structural Analysis
The Structural Analysis, is a tool that uses the equations of the resistance of materials to be able to predict the behavior of the structure which is used to analyze any given beam under prescribed loads and other external effects, such as the movements of a support to a temperature change. Performance characteristics of common interest in the design of the structures are or their resulting tensions, such as: To perform the analysis are idealized, both the geometry of the structure and the actions and conditions of support through an appropriate mathematical model should also reflect about the conditions of rigidity of the cross sections of the elements, their unions and of support on the ground. When necessary dynamic analysis, structural models must also consider the characteristics of mass, stiffness, and damping of each structural element as well as the masses of the other nonstructural elements.
 * Axial Forces
 * Shear forces
 * Bending moments
 * Deflections
 * Support Reactions

The objective of a structural system is to resist the forces that will be submitted, without failure or misbehavior. Structural analysis has three major activities to be carried out for the design of structures:
 * 1) Analysis schema definition: the real structure is idealized by a theoretical model which is feasible in graphic or symbolic representation of material things or imaginary.
 * 2) Determining load patterns: possible loads is determined considering each element in the structure.
 * 3) Determination of stresses for design: After making loads schemes already have those moments, axial loads, shear, etc.. To then combine and design the corresponding design elements.

Structural Systems indeterminate
First, we will recall a number of ideas and concepts that have been studied in the previous year. A static system is a bar chain with a number of external links, and a bar is a structural element in which a predominant dimension over the other two. Ie it has a length and a given section. Now, a static system can be hypostatic (also called mechanism ) when the number of links is not enough to ensure balance and when a force is an acceleration of the system or a fraction of the system. The second case, the system is isostatic In this case, the reactions may be obtained and to determine the characteristic efforts of the system at any point from the equations of statics. If, however, the reactions of link or determining characteristic efforts can not be obtained from equations static then These systems  ' indeterminate '. The method of the Forces or of the deformation are the traditional methods, but there are a large number of indeterminate resolution methods. Among the most popular method we can name the Cross is actually a derivative of the deformation method and can solve it iteratively. There are also tables for solving indeterminate. These tables provide dividers that allow to obtain moments and shears. In the first case these values ​​divide the light load multiplied by the square and the second the multiplied by the light load.

Finally we should mention the resolution of indeterminate systems by computers. At present there are many frames resolution programs not only flat but also space, which presents many possibilities for combination bar and also allow interleaving joints etc. . Even the generation has significantly improved since you can draw the structure and interprets program , reducing cumbersome data revenues. Also possible to obtain characteristic diagrams efforts.