Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Plastic Analysis of steel beam

[Subject Prev][Subject Next][Thread Prev][Thread Next]
The theory of plastic analysis of a structure is based on the premise that the collapse load of the structure is greater than the one that produces yield moment at the most stressed section on the structure. The yielded section becomes a "plastic hinge" and rotates while the rest of the structure absorbs the increamental load. It is commonly assumed that the plastic hinge rotates without any additional moment at the section until the structure becomes a "mechanism". This would mean that in a structure with, relatively, higher degree of redundancy, the rotation at the first plastic hinge can be fairly large.

Commonly used carbon steel (A36, A992, A572...) has, not only a yield point, but also, an ultimate strength. While the deformation beyond the yield point can be large, the material can take only so much abuse before it will break, as defined by the ultimate strength.

Therefore, in the plastic analysis of a structure, constructed from above noted material, is it not probable that the section, where the first hinge was formed, would break before the mechanism developed? If it is, is there any procedure, amenable to manual computations, to calculate the load at which the first formed hinge would break?

Thanks.

Rajendran


Yahoo! Messenger with Voice. Make PC-to-Phone Calls to the US (and 30+ countries) for 2¢/min or less.