Reliability-Based Design of Complex Structural Systems Under Earthquake Excitation.

Abstract eng:
This work presents an efficient strategy for dealing with reliability-based design problems of complex structural systems under earthquake excitation. The excitation is modeled as a non-stationary stochastic process which combines a pointsource model with a velocity pulse model. The solution of this class of problems is computationally very demanding due to the large number of structural analyses required during the design process. A model reduction technique combined with an appropriate optimization scheme is proposed to carry out the design process efficiently in a reduced space of generalized coordinates. In particular, a method based on substructure coupling technique for dynamic analysis is implemented to define a reduced-order model for the structural system. The re-assembling of the reduced-order model matrices due to changes in the values of the design variables are avoided during the optimization process. The effectiveness of the proposed methodology is demonstrated with one application problem consisting in the reliability-based design of a bridge structural model.

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