Yazar "Savas, S." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Determination of energy damping upon impact load in reinforced concrete sandwich plates with different core geometries
    (Sharif Univ Technology, 2021) Savas, S.; Ulker, M.; Turgut, S.; Bakir, D.
    It can be challenging to analyze Reinforced Concrete (RC) sandwich plates with hollow structures under impact loads in terms of crushing, punching, cracking, and crack trajectories via static and dynamic equations. In the literature, the finite element solutions were provided after determining the behaviors of the materials based on the test results. Therefore, it is required to test the behaviors of RC plates. To this end, the behaviors of sandwich plates under impact loads were experimentally analyzed in this study. The sandwich plates were manufactured by cutting Polyester Foams (PF) into hexagonal prisms, square prisms, I-type, and S-type and installing them inside the RC plates. The manufactured sandwich plates were 27% lighter than full plates. A weight of 320 kg declined freely from 2.5 in, and the load was implemented at the center of the plate at a velocity of 7.5 m/s. Similar implementations were also conducted for filled plates and the maximum displacements were measured in both types of plate tests. The measurements obtained from each test were compared to determine the sandwich plate with the core geometry which provided the highest absorption and the lowest displacement. In the analyses, the S-type core geometry exhibited greater absorption than other core geometries. (C) 2021 Sharif University of Technology. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Effect of long-term training adaptation on isokinetic strength in college male volleyball players
    (Natl Olympic Committee Ukraine, Kharkov Regional Branch, 2019) Kafkas, A.; Kafkas, M. E.; Savas, S.
    Purpose: Most of this study focused on endurance, power, and anthropometric measurements but no research declared isokinetic strength changes during two years. The purpose of this study was to assess the effect of resistance exercises on two seasonal alters in isokinetic strength of knee muscles at different angular velocities, in college volleyball players. Material: Thirteen college volleyball players, (age: 21.75 years, body mass: 78.60 kg, and height: 187.0 cm) participated in the study. All college volleyball players take part in the two-year (8 month each year) volleyball-specific training and competitions. The measurement of peak isokinetic concentric knee extension and knee flexion torque in both legs were taken at 2 angular velocities of movement, low at 60 degrees s(-1), and intermediate at 180 degrees s(-1). Results: The pre- and post-test values of the peak isokinetic strength found that statistical significance difference, at 60 degrees s(-1) and 180 degrees s(-1) for knee extensor-flexor both dominant and non-dominant in favor of post-tests. Significant enhances were observed in the baseline dominant knee extensor-flexor muscle strength (extensor knee strength 60 degrees s(-1): 19.0%, 180 degrees s(-1): 20.5%, flexor knee strength, 60 degrees s(-1): 33.4%, 180 degrees s(-1): 31.4%) respectively. Non-dominant knee extensor-flexor muscle strength increased significantly over the two-year period (extensor knee strength 60 degrees s(-1): 21.3%, 180 degrees s(-1): 23.0%, flexor knee strength, 60 degrees s(-1): 37.4%, 180 degrees s(-1): 33.9%) respectively. Conclusions: As a result, our data suggests that the two-year planned program of specific volleyball and resistance training can increase the knee muscle extensor-flexor strength and H:Q ratios of volleyball players. Especially, at a 60 degrees s(-1) and 180 degrees s(-1) angular velocities, whilst the knee muscle extensor-flexor strength and H:Q ratios for dominant and non-dominant legs were increasing, also H:Q ratios disproportion were decreasing. Therefore, these alters indicated that regular specific-volleyball and resistance training can increase knee muscle extensor-flexor strength and H:Q ratios for dominant and non-dominant legs.