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    Analytical investigation of effect of retrofit application using CFRP on seismic behavior of a monumental building at historical Cappadocia region of Turkey
    (2010) Ozturk B.; Senturk T.; Yilmaz C.
    This study focuses on analytical investigation of effect of seismic retrofit application using carbon fiber (CFRP) plates on seismic behavior of a monumental building constructed in historical Cappadocia region of Turkey. The investigated building is located at the town of Fertek which is two kilometers from the city of Nigde. It has been used as a worshipping temple since it was built in the year 1835. In addition to modal and response spectrum analysis, the building is subjected to ground motion records which were obtained during recent earthquakes in Turkey. These ground motions were recorded during Ceyhan earthquake (1998) which occured close to Nigde, Marmara earthquake (1999) and Duzce earthquake (1999). Furthermore, the building is exposed to static load combinations given in the Turkish Code. Seismic behavior of the monumental building both before and after the application of retrofitting using CFRP plates is investigated analytically. Carbon fiber (CFRP) retrofitting is applied at column and beam elements as surface coating of 0,5 cm and 1,0 cm thickness. The CFRP plates are applied at all convenient and available surfaces of column and beam elements. The analyses are conducted on the monumental building for the cases of with wall and without wall in order to consider the effect of structural walls on the seismic behavior of the building. In the light of the analytical results, expected level of structural damage of the retrofitted monumental building is examined within the scope of displacement based approach. It is observed that there is a stable decrease in maximum lateral drift demand upon application of CFRP retrofitting on the original building model.
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    Assessment of function in patients with rotator cuff tears: Functional test versus self-reported questionnaire
    (Medknow Publications, 2014) Basar S.; Citaker S.; Kanatli U.; Ozturk B.; Kilickap S.; Kafa N.
    Purpose: The rotator cuff tears (RCT) are a well-known cause of shoulder pain and loss of upper extremity function. The purpose of this study was to evaluate the upper extremity function using two different methods in patients with RCT and to determine the parameters that influence the upper extremity function.Materials and Methods: A sample of 38 patients (27-76 years; 10 men and 28 women) who were diagnosed with a chronic full-thickness RCT, confirmed by magnetic resonance imaging (MRI), was studied. Upper extremity function was determined using Western Ontario Rotator Cuff Index (WORC) and 9 Hole Peg Test (9PEG). Other assessments included active range of motion (ROM), muscle strength, shoulder pain, and scapular dyskinesis.Results: There was a weak association between WORC scores and 9PEG. A statistically significant, negative relationship was found between 9PEG and ROM in supination, as well as muscle strength of shoulder extensors, adductors, internal and external rotators.Conclusions: In addition to the weak association between WORC and 9PEG, the difference between the parameters related to each method suggests that they should not be used interchangeably to determine the upper extremity function. We recommend the utilization of 9PEG instead of WORC in assessing the upper extremity function in the setting of loss of muscle strength.
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    Investigation of effects of ground motions on SDOF systems using records from the recent earthquakes in Turkey
    (2007) Ozturk B.
    This study focuses on the evaluation of the calculated nonlinear displacement demands for single degree of freedom (SDOF) systems. The SDOF systems, which are subjected to ground motions recorded in Turkey during Marmara Earthquake (August 17th, 1999) and Duzce Earthquake (November 12th, 1999), have a variety of initial period, T values ranging from 0,1 sec. to 2,0 sec. In addition, nonlinear displacement responses of the SDOF systems are investigated for different base shear strength coefficients, Cy using both Reducing Stiffness and Elasto-Plastic models. A viscous damping of 2% of critical damping is assumed. The nonlinear displacement requirements are compared to the linear displacement response spectra developed by Lepage. In the light of the findings from the earthquake records; considering the velocity increment, ?V, an approach regarding the energy input to a system during the strong motion shaking is introduced. The concept of ground velocity increment, ?V and its effects on the nonlinear displacement response of SDOF systems will be investigated. The correlation between maximum nonlinear displacement response and ground velocity increment, ?V will be evaluated. The change in displacement corresponding to a velocity increment will be estimated by using an idealized model similar to those used by Westergaard and Newmark, considering a rectangular pulse of acceleration. © 2007 American Society of Civil Engineers.