NSA in collaboration with Ahuja Consultants Pvt Ltd. Delhi did PBD analysis and Pushover analysis of a 42 storey building (Basement + ground + 42)

The design objectives in current building codes address life safety, control damage in minor and moderate earthquakes, and prevent collapse in a major earthquake. The idea of designing the structure based on performance objective is not new. A limit state is a form of performance objective.Target displacement was first applied as the response parameter of a substitute single degree-of-freedom (SDOF) system. The structural response in terms of displacement can be related to strain-based limit state, which in turn is assumed to be related to the level of damage. For a defined performance of a structure in terms of a state of damage, strain and deformation give better indicators of damage than stresses. The use of serviceability limit strains enables a consistent level of assessment to be achieved.To reduce the high costs associated with loss of use and repair of heavily damaged structures, different levels of performance objectives need to be considered. In effect,performance based-design is a powerful new approach that includes traditional methods of seismic design with significant upgrades.

There are several challenges to be addressed before procedures for performance-based design can be widely accepted. The development in performance-based design in seismic engineering will be directed towards the definition of performance objectives, a general design methodology, issues of ground motion modelling, and demand and capacity evaluations.