캐비닛내부응답스펙트럼을 위한 전기캐비닛 전도강성
Rocking Stiffness of Electrical Cabinet for In-Cabinet Response Spectrum
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초록
Electrical instruments and devices contained in cabinets for controlling nuclear power plants require seismic qualification; likewise, in-cabinet response spectrum (ICRS) is necessary. Gupta et al. (1999) suggested the Ritz method, where rocking, frame bending, and plate bending behaviors of cabinets are considered, as a method for determining ICRS. This research proposes a method to determine the rocking stiffness of cabinets, which represents its rocking behavior. The cabinet is fixed on mounting frames and is connected to the base concrete by anchors. When horizontal excitation is applied to the cabinet, the mounting frames at anchors are locally deformed, the mounting frames are bent, and then rocking in the cabinet becomes evident. A method to determine equivalent vertical spring stiffness representing the local deformation of the mounting frames at anchors is then proposed. Subsequently, the rocking stiffness of this mounting frame is calculated upon assumption of the mounting frame as an indeterminate beam.
Abstract
Electrical instruments and devices contained in cabinets for controlling nuclear power plants require seismic qualification; likewise, in-cabinet response spectrum (ICRS) is necessary. Gupta et al. (1999) suggested the Ritz method, where rocking, frame bending, and plate bending behaviors of cabinets are considered, as a method for determining ICRS. This research proposes a method to determine the rocking stiffness of cabinets, which represents its rocking behavior. The cabinet is fixed on mounting frames and is connected to the base concrete by anchors. When horizontal excitation is applied to the cabinet, the mounting frames at anchors are locally deformed, the mounting frames are bent, and then rocking in the cabinet becomes evident. A method to determine equivalent vertical spring stiffness representing the local deformation of the mounting frames at anchors is then proposed. Subsequently, the rocking stiffness of this mounting frame is calculated upon assumption of the mounting frame as an indeterminate beam.
참고문헌 (6)
- "IEEE Std 344-2004. IEEE Recommended Practice for Seismic Qualification of Class 1E Equipment for Nuclear Power Generating Stations", The Institute of electrical and electronics Engineers. Inc, ~ (2005)
- "KEPIC END-2000. Recommended Practice for Seismic Qualification of Class 1E Equipment for Nuclear Power Generating Stations. Korea Electric Power Industry Code", Korea Electric Association, ~ (2007)
- Gupta A, "Ritz Vector Approach for Evaluating Incabinet Response Spectra", Nuclear Engineering and Design, 190(2), pp.255~272 (1999)
- 김기현, "캐비닛내부응답스펙트럼 산정을 위한 리츠방법의 정식화 및 단순예제를 통한 검증", 한국지진공학회논문집, 23(5), pp.279~288 (2019), 한국지진공학회[DOI]
- "KS D 3568. Carbon Steel Square Pipes for General Structural Purposes", ~ (2018)
- Yang, JR, "Rocking Stiffness of Mounting Arrangements in Electrical Cabinets And Control Panels", Nuclear Engineering and Design, 219, pp.127~141 (2002)