9.1 Basis for Design
9.1.1 Design Objective
The objective of design 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.
9.1.2 Methods of Design
9.1.2.1 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. Calculations alone may not produce safe, serviceable and durable structures. Suitable materials, quality control, adequate detailing and good supervision are equally important.
9.1.2.2 Where the limit states method cannot be conveniently adopted; the working stress design [see Section 6(m)] may be used.
9.1.3 Design Process
Structural design, including design for durability, construction 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.