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BROWSE대한건축학회 논문집(구조계)2020-03 > DETAIL
  LITERATURE >JOURNALS [395848] Download the full text :   
Title   비구조요소의 내진설계를 위한 등가정적 층가속도 평가 / Evaluation of Equivalent-Static Floor Acceleration for Seismic Design of Non-Structural Elements
Authors   전수찬(Jun, Su-Chan) ; 이철호(Lee, Cheol-Ho) ; 배창준(Bae, Chang-Jun) ; 김성용(Kim, Sung-Yong)
Organization   대한건축학회
Source   대한건축학회논문집 구조계, Vol.36 No.03(2020-03)
Page   Start Page(121) Total Page(8)
ISSN   1226-9107
Classification   구조  / 재료 
Keywords   내진설계; 비구조요소; 등가정적법; 동적해석법; 층응답가속도; 비틀림 증폭//Seismic Design; Non-Structural Elements; Equivalent Static Approach; Dynamic Method; Floor Acceleration; Torsional Amplification
Abstract1   본 연구에서는 비구조요소의 내진설계를 위해 제시된 ASCE 7의 등가정적법의 대표적 문제점을 계측가속도기록, 해석 및 이론적 분석에 근거하여 평가하였다. 본 연구의 분석결과 구조물에 작용하는 최대층가속도는 비구조요소를 지지하는 구조물의 주기, 고차모드, 비선형거동 및 비틀림 거동의 영향을 받음을 확인하였다. 현행 등가정적해석법은 주요 구조변수를 누락한 지나친 간략화로 인해 저층 정형 구조물 외에는 최대층가속도를 정확하게 평가하지 못하는 한계가 있음을 확인하였다. 최대층가속도에 대한 각 주요 구조변수의 영향을 평가하였다.
Abstract2   In this paper, the ASCE 7 equivalent static approach for seismic design of non-structural elements is critically evaluated based on the measured floor acceleration data, theory of structural dynamics, and linear/nonlinear dynamic analysis of three-dimensional building models. The analysis of this study on the up-to-date database of the instrumented buildings in California clearly reveals that the measured database does not well corroborate the magnitude and the profile of the floor acceleration as proposed by ASCE 7. The basic flaws in the equivalent static approach are illustrated using elementary structural dynamics. Based on the linear and nonlinear dynamic analyses of three-dimensional case study buildings, it is shown that the magnitude and distribution of the PFA (peak floor acceleration) can significantly be affected by the supporting structural characteristics such as fundamental period, higher modes, structural nonlinearity, and torsional irregularity. In general, the equivalent static approach yields more conservative acceleration demand as building period becomes longer, and the PFA distribution in long-period buildings tend to become constant along the building height due to the higher mode effect. Structural nonlinearity was generally shown to reduce floor acceleration because of its period-lengthening effect. Torsional floor amplification as high as 250% was observed in the building model of significant torsional irregularity, indicating the need for inclusion of the torsional amplification to the equivalent static approach when building torsion is severe. All these results lead to the conclusion that, if permitted, dynamic methods which can account for supporting structural characteristics, should be preferred for rational seismic design of non-structural elements.
Location   대한건축학회