Abstract: Coordinates can be calculated using satellites such as GPS, GLONASS and Galileo with known orbits. All of these systems including Compass are called GNSS. To increase the accuracy of point coordinates, the error sources of GNSS are being researched for a long time. One of these errors is the antenna phase center unknown. Due to the fact that the antenna phase center is a dynamic point, it cause an error and this error consists of antenna phase center offset and antenna phase center variations that have to be known. In this study, types of antenna calibration, specifications of an antenna calibration area and national studies on this subject are explained. Also, a study on antenna calibration network which established at Istanbul Technical University is mentioned

• Publication Date: 26-Oct-2014
• DOI: 10.15224/978-1-63248-030-9-27
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Abstract: In the construction of nuclear power plants using massive walls, the use of high-strength reinforcing bars for shear design is necessary, to enhance the constructability and economy. In this study, heavily reinforced walls with aspect ratio of 2.0 were tested, to investigate the shear capacity under cyclic loading. The major test parameters were the grade of shear reinforcement (Grade 550 / 420 MPa), web bar ratio (half / full of permissible maximum bar ratio. According to the direct comparison between the walls with 550 and 420 MPa bars, they had negligible difference in the failure modes, peak shear strength, and lateral stiffness. Particularly, for the walls with Grade 550 MPa bars, the safety margin predicted by ACI 349 was significant. The test result indicates that Grade 550 MPa bars can be applicable to RC walls with aspect ratio less than or equal to 2.0.

• Publication Date: 26-Oct-2014
• DOI: 10.15224/978-1-63248-030-9-28
• Views: 0
• Downloads: 0