구조물-비구조요소 2자유도 결합시스템 해석을 통한 비구조요소 내진설계변수 평가
Evaluation of Seismic Design Parameters for Nonstructural Components Based on Coupled Structure-Nonstructural 2-DOF
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
Seismic demand on nonstructural components (NSCs) is highly dependent on the coupled behavior of a combined supporting structure- NSC system. Because of the inherent complexities of the problem, many of the affecting factors are inevitably neglected or simplified based on engineering judgments in current seismic design codes. However, a systematic analysis of the key affecting factors should establish reasonable seismic design provisions for NSCs. In this study, an idealized 2-DOF model simulating the coupled structure-NSC system was constructed to analyze the parameters that affect the response of NSCs comprehensively. The analyses were conducted to evaluate the effects of structure-NSC mass ratio, structure, and NSC nonlinearities on the peak component acceleration. Also, the appropriateness of component ductility factor (Rp) given by current codes was discussed based on the required ductility capacity of NSCs. It was observed that the responses of NSCs on the coupled system were significantly affected by the mass ratio, resulting in lower accelerations than the floor spectrum-based response, which neglected the interaction effects. Also, the component amplification factor (ap) in current provisions tended to underestimate the dynamic amplification of NSCs with a mass ratio of less than 15%. The nonlinearity of NSCs decreased the component responses. In some cases, the code-specified Rp caused nonlinear deformation far beyond the ductility capacity of NSCs, and a practically unacceptable level of ductility was required for short-period NSCs to achieve the assigned amount of response reduction.
Abstract
Seismic demand on nonstructural components (NSCs) is highly dependent on the coupled behavior of a combined supporting structure- NSC system. Because of the inherent complexities of the problem, many of the affecting factors are inevitably neglected or simplified based on engineering judgments in current seismic design codes. However, a systematic analysis of the key affecting factors should establish reasonable seismic design provisions for NSCs. In this study, an idealized 2-DOF model simulating the coupled structure-NSC system was constructed to analyze the parameters that affect the response of NSCs comprehensively. The analyses were conducted to evaluate the effects of structure-NSC mass ratio, structure, and NSC nonlinearities on the peak component acceleration. Also, the appropriateness of component ductility factor (Rp) given by current codes was discussed based on the required ductility capacity of NSCs. It was observed that the responses of NSCs on the coupled system were significantly affected by the mass ratio, resulting in lower accelerations than the floor spectrum-based response, which neglected the interaction effects. Also, the component amplification factor (ap) in current provisions tended to underestimate the dynamic amplification of NSCs with a mass ratio of less than 15%. The nonlinearity of NSCs decreased the component responses. In some cases, the code-specified Rp caused nonlinear deformation far beyond the ductility capacity of NSCs, and a practically unacceptable level of ductility was required for short-period NSCs to achieve the assigned amount of response reduction.
참고문헌 (28)
- Applied Technology Council, "Reducing the Risks of Nonstructural Earthquake Damage - A Practical Guide", Federal Emergency Management Agency, ~ (2011)
- Lee CH, "Review of Equivalent Static and Dynamic Methods for Seismic Design of Non-Structural Components", Magazine of the Korea Society of Steel Construction, 32(1), pp.8~16 (2020)
- Korea Construction Standard Center, "Seismic Building Design Code (KDS 41 17 00)", ~ (2019)
- American Society of Civil Engineers, "Minimum Design Loads and Associated Criteria for Buildings and Other Structures (ASCE", SEI 7-16), 2017
- 전수찬, "비구조요소의 내진설계를 위한 등가정적 층가속도 평가", 대한건축학회논문집 구조계, 36(3), pp.121~128 (2020), 대한건축학회
- 최인섭, "건축 비구조재의 내진설계요소 및 내진설계하중에 관한 고찰", 대한건축학회논문집 구조계, 35(5), pp.117~124 (2019), 대한건축학회
- AnajafiH, "Evaluation of ASCE 7 equations for designing acceleration-sensitive nonstructural components using data from instrumented buildings", Earthquake Engng Struct Dyn., 47(4), pp.1075~1094 (2018)
- Miranda E, "Towards a new approach to design acceleration-sensitive non-structural components", Proceedings of the 11th U.S. National Conference on Earthquake Engineering, pp.25~29 (2018), Earthquake Engineering Research Institute
- Petrone C, "Seismic demand on light acceleration-sensitive nonstructural components in European reinforced concrete buildings", Earthquake Engng Struct Dyn., 44(8), pp.1203~1217 (2015)
- Singh MP, "Seismic design forces. I: rigid nonstructural components", Journal of Structural Engineering, 132(10), pp.1524~1532 (2006), ASCE
- Singh MP, "Seismic design forces. II: Flexible nonstructural components", Journal of Structural Engineering, 132(10), pp.1533~1542 (2006), ASCE
- Paolo M. Calvi, "Estimating floor spectra in multiple degree of freedom systems", Earthquakes and Structures, 7(1), pp.17~38 (2014), 테크노프레스[DOI]
- Wieser J, "Floor Accelerations in Yielding Special Moment Resisting Frame Structures", Earthquake Spectra, 29(3), pp.987~1002 (2013)
- Suarez, "Floor response spectra with structureequipment interaction effects by a mode synthesis approach", Earthquake Engng Struct Dyn., 15(2), pp.141~158 (1987)
- Gupta VK, "Acceleration transfer function of secondary systems", Journal of Engineering Mechanics, 123(7), pp.678~685 (1997), ASCE
- Lin J, "Seismic Response of Light Subsystems on Inelastic Structures", Journal of Structural Engineering, 111(2), pp.400~417 (1985)
- Lima C, "Seismic Response of Acceleration-Sensitive Non-Structural Components in Buildings", Buildings, 9(1), pp.7~ (2019)
- Adam C, "Seismic response characteristics of nonstructural elements attached to inelastic buildings", Proceedings of 7th European Conference on Structural Dynamics (2008), University of Southampton
- Villarverde R, "Simple method to estimate the seismic nonlinear response of nonstructural components in buildings", Engng Structures, 28(8), pp.1209~1221 (2006)
- Newmark NM, "Earthquake Spectra and Design", pp.103~ (1982), Earthquake Engineering Research Institute
- Chopra AK, "Dynamics of Structures" (2014), Prentice Hall
- Seismic demands for performance evaluation of steel moment resisting frame structures, "Gupta A", Department of Civil and Environmental Engineering, Stanford University, ~, pp.Report No. 132 (1999)
- Sankaranarayanan R, "Acceleration response modification factors for nonstructural components attached to inelastic moment-resisting frame structures", Earthquake Engng Struct. Dyn., 36(14), pp.2189~2210 (2007)
- AnajafiH, "Damping modification factor for elastic floor response spectra", Bull Earthquake Eng., 17, pp.6079~6108 (2019)
- AnajafiH, "Inelastic floor response spectra for designing anchored acceleration-sensitive nonstructural components", Bull Earthquake Eng, 18, pp.2115~2147 (2020)
- Survey and characterization of floor and wall mounted mechanical and electrical equipment in buildings, "Watkins DA", Department of Structural Engineering, University of California, ~, pp.Rep. No. SSRP -2009 (2009), 11
- Seimic Evaluation and Retrofit of Concrete Buildings, "Applied Technology Council", Redwood City, ~, pp.Report ATC-40 (1996)
- Seismic Analysis, Design, and Installation of Nonstructural Components and Systems-Background and Recommendations for Future Work, "Applied Technology Council", National Institute of Standards and Technology, ~, pp.Report NIST GCR 17-917-44 (2017)