수평하중을 받는 합성보의 탄소성거동에 관한 연구


Elasto-Plastic Behavior of Composite Girders Subjected to Lateral Loads

황성철, 박성수

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Composite girders can increase the stiffness and strength under the positive bending. It also tends to fracture at the bottom flange, which was observed in 1995 Kobe earthquake. The following problems are enumerated in using such composite girders.
1) Elastic and plastic flexural rigidity of the composite girders differ under the positive and negative bending, which increases the complexity of the frame analysis. 2) The strength estimate of the composite girders under the positive bending is dependent on the effective compressive strength of the concrete slab, so the resistance factor for composite girder is smaller than that for pure structural steel beam. 3) The bottom flange of the composite girder subjects to large strain reversal due to the movement of the neutral axis near to the upper flange under the positive bending, which is thought to be the reason of the bottom flange fracture observed.
This paper showed the elasto-plastic behavior of composite girder. The tests object performed in our country was set as the comparison target of analysis. This analytical method showed comparatively simple agreement with the results of tests on composite girder.


 1. 서 론
 2. 해석 대상의 시험체
 3. 합성보 탄소성 해석상의 가정
  3.1 합성보 유효폭의 가정
  3.2 등가단면 2차모멘트의 가정
  3.3 탄소성거동의 가정
  3.4 정·부모멘트 내력의 가정
 4. 해석치와 실험치의 비교
  4.1 합성보의 모멘트와 회전각
  4.2 에너지 흡수능력
 5. 결 론


  • 황성철 Hwang, Sung-Chul. 정회원, 부산대 건축공학과 BK21신진연구원, 공학박사
  • 박성수 Park, Sung-Soo. 정회원, 부산대 건축공학과 교수, 공학박사


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