Steel structure has three methods of design
which are as under:
- Plastic
- Elastic
- Limit sate
Plastic design - is a criterion in analysis
of a design structure considering the final load of the structural design. The
expression plastic is derived from the final load that is created from the
strength of steel in the range of plastic.
This is a fast method providing a rational
method for the study of the steel structure that helps to provide a striking
economy as against the weight of steel since the sections needed by this
approach are comparatively small in size than those needed by the elastic
analysis method. It is better to know that plastic analysis and steel structure
design have its main application in the design and analysis of statically undefined
framed structures.
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| Steel structure |
Elastic design - is a traditional design
method. Majority of steel is elastic up to the given point and elastic theory
is a superior method on which ton base design. Elastic theory analyzes
structures and sections are sized so the tolerable stresses do not increase.
Design is in accordance with BS 449: plastic theory which is developed to take
into account of behavior past the yield point dependent on finding the load
that cases the steel structure design to collapse. Then work load collapses
divided by a load factor. This too is permitted under BS449.
Limit sate design - It is the primary duty
of a Civil Engineering Designer to ensure that the amenities he designs or are
prepared by steel design services are fit for its purpose; are safe, economic
as well as durable. Ensuring safety is one of the major duties of the designer.
Though, it is not easy to assess primarily that how safe a proposed design will
really be. There is a great deal of uncertainty about a few factors that influence
safety as well as economy. Uncertainties that may affect the safety of a
structural design are caused due to the following:
- Loading
- Material strength
- Structural dimensions plus behavior
Together these uncertainties make it
difficult for any designer to ensure that a design structure provided by the
structural design services will be completely safe. The designer can just
confirm about the risk involved or failure despite the uncertainties.
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