General Steel Design Requirements : Basis For
Design
The general design requirements are outlined in Section 3 of
IS 800:2007.
BASIS FOR
DESIGN
The bases of the design are given in Section 3.1 of IS
800:2007. It is as follows.
1. Design Objective
The objective of design, as
outlined in Cl.3.1.1 of IS 800:2007, is the achievement of an acceptable
probability that structures will perform satisfactorily for the intended
purpose during the design life. With an appropriate degree of safety, they
should sustain all the loads and deformations, during construction and use and
have adequate resistance to certain expected accidental loads and fire.
Structure should be stable and have alternate load paths to prevent
disproportionate overall collapse under accidental loading.
2. Methods of Design
Method of Design of steel
structures is given in Cl. 3.1.2 of IS 800:2007. In the previous version of the
code, the design of steel structures was essentially using Working Stress
Method. But IS 800:2007 permits us to design the structure to satisfy the
various Limit States. It also advocates the use of Working Stress Method only
to the situations where Limit State cannot be conveniently employed. As per Cl.
3.1.2.1 of IS 800:2007, Structure and its elements shall normally, be designed
by the limit state method. Account should be taken of accepted theories,
experimental information and experience and the need to design for durability.
This clause admits that calculations alone may not produce Safe, serviceable
and durable structures. Suitable materials, quality control, adequate detailing
and good supervision are equally important. As per Cl. 3.1.2.2 of IS 800:2007,
where the limit states method cannot be conveniently adopted; the working
stress design (Section 11 of IS 800:2007) may be used.
3. Design Process
Clause 3.1.3 of IS 800:2007
specifies structural design, including design for durability, onstruction and
use should be considered as a whole. The realization of design objectives
requires compliance with clearly defined standards for materials, fabrication,
erection and in-service maintenance.
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