Nonlinear dynamic analysis of base-isolated frames using Julia
Abstract
Base isolation is a technique used in the field of structural passive control. In this technique, the superstructure is isolated from the ground motion by means of bearing systems. Thus, the transmission of the ground motion to superstructures is reduced. By “separating” the superstructure from its foundation, the input energy from the earthquake is mainly converted into the kinetic energy of the superstructure, only a small portion of it enters the superstructure in the form of strain energy, alleviating the damages to it. This article presents the modeling and the nonlinear dynamic analysis of base-isolated frame structures using linear theory (with non-classical damping matrix) and nonlinear theory (with 6-parameter Bouc-Wen bearing model). The computations are done with the aid from Julia scientific language. Results from case studies illustrate the effectiveness of the base-isolation technique. Solving the problem with provided Julia codes is easy. The Julia codes can be effectively applied to solve a wider range of base-isolated structures to obtain the structural responses, thus the design for such a new kind of structures can be made easier.
Keywords: Base isolation, base-isolated frame, nonlinear dynamic analysis, Julia.
Received: October 4th, 2017; revised: October 27th, 2017; accepted: November 2nd, 2017
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