• 한국강구조학회 논문집
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• 제27권5호
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• pp.447-454
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• 2015

원형강관구조 접합부는 재료의 발전과 접합부의 복잡한 국부 거동 때문에 지속적인 연구되고 있다. 이 연구는 지강관에 압축력이 작용하는 원형강관 X-이음 트러스접합부의 주강관 소성화변형과 접합부 강도에 재료강도와 주강관벽세장비가 미치는 영향을 파악하는 것을 목적으로 한다. 이를 위하여 재료강도와 주강관벽세장비를 변수로 하여 다양한 원형강관 X-이음 트러스접합부에 대하여 범용 유한요소해석 프로그램인 ANSYS Mechanical APDL을 사용하여 정밀유한요소해석을 수행하였다. 해석결과를 토대로 현행 건축구조기준에서 제시하는 주강관소성화 한계상태의 접합부 설계강도를 검토하였다. 결론적으로 원형강관 X-이음 트러스접합부 설계에서 고려해야 할 사항을 제시하였다.

• Steel and Composite Structures
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• 제5권1호
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• pp.49-70
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• 2005

This paper reports on finite element analysis techniques that may be applied to the study of circular hollow structural sections and related bearing connection geometries. Specifically, a connection detail involving curved steel saddle bearings and a Structural Tee (ST) connected directly to a large-diameter Hollow Structural Section (HSS) truss chord, near its open end, is considered. The modeling is carried out using experimentally verified techniques. It is determined that the primary mechanism of failure involves a flexural collapse of the HSS chord through plastification of the chord wall into a well-defined yield line mechanism; a limit state for which a shell-based finite element model is well-suited to capture. It is also found that classical metal plasticity material models may be somewhat limited in their applicability to steels in fabricated tubular members.

• Steel and Composite Structures
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• 제24권4호
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• pp.455-465
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• 2017

This paper presents a series of ultimate and fatigue experimental investigation on concrete-filled rectangular hollow section (CRHS) X joints with Perfobond Leister rib (PBR) under tension. A total of 15 specimens were fabricated, in which 12 specimens were tested under ultimate tension and 3 specimens were investigated in fatigue test. Different parameters including PBR stiffening, brace-to-chord ratio (${\beta}$) and inclined angle (${\theta}$) were considered in the test. Each joint was tested to failure under tension load. Obtained from test result, PBR was found to improve the tension strength and fatigue durability of CRHS joint substantially. Concrete dowel consisted by PBR and concrete inside the chord stiffened the joint, which leaded to a combination failure mode of punching shear and chord plastification of CRHS joint under tension. Finite element analysis validated the compound failure mode. Stress concentration on typical spot of CRHS joint was mitigated by PBR which was observed from fatigue test. Initial fatigue crack presented in CRHS joint with PBR also differentiated with the counterpart without PBR.