Journal of Korean Society of Steel Construction (한국강구조학회 논문집)

Korean Society of Steel Construction (한국강구조학회)
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Seismic Performance of Shear Dominant Hybrid Steel Link Beam with Circular Web Opening

원형 개구부가 있는 전단지배 하이브리드 강재 연결보의 내진성능

  • Lim, Woo-Young (Department of Architectural Engineering, Wonkwang University)
  • 임우영 (원광대학교, 건축공학과)
  • Received : 2017.12.04
  • Accepted : 2018.01.23
  • Published : 2018.02.27
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Abstract

Cyclic loading tests for shear dominant hybrid steel link beams with circular web openings were performed to evaluate the seismic performance. Four half-scaled specimens with bolted connections were tested. The test parameter is a diameter of the web opening, i.e., shear strength ratio ($V_{pw}/V_p$) of the link beam and presence of top-seat angles. Using test results, adequate design shear strength of link beam was finally suggested. Test results showed that when the shear capacity is less than half of the plastic shear strength, seismic performance was improved due to mitigation of pinching under reversed cyclic inelastic deformations.

이 연구에서는 원형 개구부가 있는 전단지배 하이브리드 강재 연결보의 내진성능을 평가하기 위해 탑-시트 앵글이 있는 실험체 3개(SCB1, SCB2, SCB3)와 앵글이 없는 실험체 1개 (SCB4) 등 총 4개의 강재 연결보 시스템에 대한 반복가력 실험이 수행되었다. 실험변수는 웨브 개구부의 크기, 즉 전단강도비이다. SCB1, SCB2, SCB3, 그리고 SCB4 실험체의 전단강도비(웨브 개구부 크기)는 0.34(300mm), 0.49(268mm), 0.78(200mm), 그리고 0.34(300mm)이다. 실험결과, 제안된 연결보 시스템은 우수한 변형능력과 강성을 보여주었다. 실험연구를 통해 하이브리드 강재 연결보 시스템에 적용가능한 설계전단강도를 제안하였다. 연결보의 전단강도가 소성전단강도의 50% 이하일 때 핀칭이 완화되는 것으로 나타났으며, 이로 인해 내진 성능이 향상되는 것으로 나타났다. 핀칭을 최소화하고, 내진성능을 향상시키기 위해서는 연결보 구조설계 시 연결보의 전단강도를 50% 이상 저감시키는 방안도 고려될 수 있을 것으로 판단된다.

Keywords

References

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