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Öğe A comparative study between acceleration and energy-based Seismic demand spectra computed by an extensive computer algorithm on a grid computer (COMPDYN 2013)(National Technical University of Athens, 2013) Dindar A.A.; Yalcin C.; Yuksel E.; Ozkaynak H.; Buyukozturk O.This study aims to define the Seismic Energy that is imparted into the structure. When compared the energy-based spectra with the acceleration response spectra that are used in various codes, the latter do not take the duration and the frequency contents of the ground motion records, while the energy-based spectra takes these features into account and also combines the ground excitation and the structural response in its formulation. Therefore, enormous computations are required in the construction of the energy-based spectra while covering all the related parameters of ground motion and also the structural properties. This requirement is overcome by developing an extensive computer algorithm that ran in grid computer system in a computer laboratory of Istanbul Kultur University Civil Engineering Department.Öğe Evaluation of integration techniques used in PsD testing methodology(European Association for Structural Dynamics, 2014) Ozkaynak H.; Güney A.K.; Yüksel E.Pseudo dynamic testing (PsD) methodology is used to simulate earthquake effects on the structures or structural components and it consists of both the analytical and experimental parts with a coupled interaction. The dynamic equilibrium equation is generated and the displacement vector to be applied to the specimen in the next step is calculated by using an appropriate numerical integration technique. The overall success of pseudo dynamic tests not only depends purely on the resolution of the measurement devices but also highly depends on the sensitivity and convergence of the integration techniques used for the solution of the dynamic equation of motion. In this study, the success of the central difference method, operating splitting method (OSM) and ?operating splitting methods (?OSM) are evaluated by means of several PsD simulations performed on a steel single degree of freedom (SDOF) system having three alternative constitutive models. The main parameters are the integration technique, time intervals and constitutive models. The advantages of the techniques are compared in terms of the test duration and convergence capability. In conclusion, for all behavior types CDM and OSM methods can be used with the time interval which is equal or larger than the input earthquake data. This means great saving of time during the PsD test and it increase the overall success of the experiment.