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ABS Najjarzadegan

The Development of Simultaneous Dynamic Testing and Analysis of Connected Substructures

Abstract

This thesis presents the development of a novel structural testing method called "real

time hybrid dynamic test" in which actuators, shaking table and computational models

are simultaneously used for the seismic simulation of structures. According to

"substructuring technique", the arbitrary structure is divided into one or more

experimental and computational substructures. The experimental substructure is chosen

from those parts of the structure which do not show predictable and highly accurate

behavior under the dynamic loads and at the same time its modeling is too hard. After

the selection of the physical substructure, the appropriate boundary conditions should be

considered. Generally speaking, the interface forces between the physical and numerical

substructures are imposed by actuators while vibrations due to the earthquake are

exerted by shaking table on specimen. Since base excitation is applied by shaking table,

the inertial effects are considered in specimen members. Now the question is how to

distribute the load exerted on the specimen between actuators and shaking table. This

division is done through splitting functions. However, in case appropriate functions are

used, the test required power is optimized. Therefore, in this research, after reviewing

testing methods in earthquake engineering and the numerical integration algorithms

associated with hybrid simulation, the methods of the optimization of the required

power for simultaneous dynamic testing and analysis of the substructures are

investigated.

Keywords: substructuring technique, hybrid simulation, real time hybrid test, numerical

integration algorithms, optimizing of the required power.