Efficient Robust Optimization of Structures Subjected to Earthquake Load and Characterized by Uncertain Bounded System Parameters - Structural Seismic Design Optimization and Earthquake Engineering - page 105

Chapter 5
Efficient Robust Optimization
of Structures Subjected
to Earthquake Load and
Characterized by Uncertain
Bounded System Parameters
Subrata Chakraborty
Bengal Engineering and Science University, Shibpur, India
Soumya Bhattacharjya
Bengal Engineering and Science University, Shibpur, India
ABSTRACT
An efficient robust design optimization (RDO) procedure is proposed in the framework of an adaptive
response surface method (RSM) for structures subjected to earthquake load and characterized by un-
certain but bounded system parameters. The basic idea of the proposed RDO approach is to improve
the robustness of a design by using a new dispersion index which utilizes the relative importance of the
gradients of the performance function. The same concept is also applied to the constraints. The repeated
computations of stochastic responses and their sensitivities for evaluating the stochastic constraint of
the associated optimization problem are efficiently obtained in the framework of an adaptive RSM. The
proposed RDO approach is elucidated through the optimization of a three-storied concrete frame struc-
ture. The numerical study depicts that the proposed RDO results are in conformity with the conventional
RDO results. However, definite improvements are achieved in terms of robustness and computational
time requirements indicating its efficiency over the conventional RDO approach.