Steel structures

[admin]

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[ennio curto]

More information about residual stress measurement NDT/NDE

The residual stress in a metal do not depend on it hardness, but from the module of elasticity or Young module and from its chemical composition (density).
The hardness of a metal indicates its ability to absorb energy elastic, plastic or kinetic energy, but through it not possible to determine the value of residual stress. In a metal with the same hardness we will have a different values of this stress. Therefore, the problem will be to measure the values that vary so exactly proportional to the residual stress values in a given metal.
The residual stresses tend to equilibrate themselves in the surface of the material.
The measurement made with all the major methods, X-ray, string gauge (destructive), optical etc. the residual stress is determined between the measuring the displacement of the equilibrium point the reticule crystalline.
The method discovered analyzes the value of acceleration vibratory generated by an impulse to constant energy with the subsequent reaction elastic (elastic field) from the metal, The equipment does not recognize the value of compression from that of tensile stress. It gives the value of the space resulting or volume but with the applying of a triaxial accelerometer we can have forces values axis x, y, z.

You will realize the convenience of this system.
1) Portable and easy to use and very rapid, high accuracy.
2) NDT/NDE non-destructive testing.
3) Repeatable in unlimited number of times.
4) Not dangerous (X-ray).
5) Do not expensive. Effective for welding, hardened treatments, vessels control, bridges, pipes line, aeronautics, NDT inspection for every metal types.



p.i Ennio Curto.

[YESIM]

I want to write something about this topic.

A steel building is a metal structure fabricated with steel for the internal support and, commonly but not exclusively, for exterior cladding. Such buildings are used for a variety of purposes including storage, office space and living space. They have evolved into specific types depending on how they are used

Advantages
High quality, aesthetic
Low maintenance costs
Steel is Non combustible
Environmentally friendly
Components can be re-used
Strong, durable and stable
Dimensionally stable
Construction is fast compared to other materials
Offers fast construction
Resistant to termites and other destructive insects.
Cost benefits compared to other construction methods
Components are functional
Disadvantages
Heat conductivity. Calculations show that the web of an 18-gauge steel stud is about 31 times thinner than a "two-by" wood stud; however, steel conducts heat 310 times more efficiently than wood. As a net result, a "two-by" steel stud will conduct 10 times more heat than a "two-by" wood stud.
Corrosion. Faulty design leads to the corrosion of iron and steel in buildings.

[aksavarna]

take a look at some astounding Japanese Highways, Bridges & Interchanges... All are made using steel. They can be included in steel structures categories? http://loveofmachines.blogspot.com/search/label/bridges

[rozordermit]

Wow, those are really wonderful Highways. Thanks for sharing with us,,,,

[engenhariacivil]

Here is a nice video about the effects of wind on a metallic bridge:
http://video.engenhariacivil.com/efeito-de-tunel-de-vento-em-ponte-97

[nick4u1]

wow, makes Britain look so ancient still, all the while its incredibly impressive to look at its not always practical or cost effective to build such highways.

[aaron.adley]

The quality of the alloy can be very well judged by its appearance and lustrous surface.
The more the luster on the surface, the more refine will the steel be. The quality can be measured by the steel specifications like hardness of surface, brightness and smoothness of the surface and absence of any depressions or troughs. The alloy has not only to be hard but it has to be durable.

[Haseeb Jamal]

Steel Structures Design and Behavior, AISC Steel Design, Steel Design Course

Design of Steel Structures (http://www.aboutcivil.com/design-of-steel-structures.html)