• Structural Engineering and Mechanics
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• 제86권3호
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• pp.417-430
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• 2023

As the key part in the reinforced concrete column-steel beam (RCS) frame, the beam-column joints are usually subjected the axial force, shear force and bending moment under seismic actions. With the aim to study the seismic behavior of RCS joints with and without RC slab, the quasi-static cyclic tests results, including hysteretic curves, slab crack development, failure mode, strain distributions, etc. were discussed in detail. It is shown that the composite action between steel beam and RC slab can significantly enhance the initial stiffness and loading capacity, but lead to a changing of the failure mode from beam flexural failure to the joint shear failure. Based on the analysis of shear failure mechanism, the calculation formula accounting for the influence of RC slab was proposed to estimate shear strength of RCS joint. In addition, the finite element model (FEM) was developed by ABAQUS and a series of parametric analysis model with RC slab was conducted to investigate the influence of the face plates thickness, slab reinforcement diameter, beam web strength and inner concrete strength on the shear strength of joints. Finally, the proposed formula in this paper is verified by the experiment and FEM parametric analysis results.

• Structural Engineering and Mechanics
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• 제5권5호
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• pp.625-634
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• 1997

Reinforced concrete (RC) interior beam-column joints with high-strength materials: concrete compressive strength of 100 MPa and the yield strength of longitudinal bars of 685 MPa, were analyzed using three-dimensional (3-D) nonlinear finite element method (FEM). Specimen OKJ3 of joint shear failure type was a plane interior joint, and Specimen 12 of beam flexural failure type was a 3-D interior joint with transverse beams. Though the analytical initial stiffness was higher than experimental one, the analytical results gave a good agreement with the test results on the maximum story shear forces, the failure mode.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1993년도 가을 학술발표회 논문집
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• pp.237-242
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• 1993

Precast concrete panel buildings are designed to tracsmit shear forces through the joint between the reinforced concrete panels. The shear strength is partly provided by the resistance to sliding at the interface between the precast and in- situ concrete and partly by the dowel action of the reinforcement crossing the joint. The shear resistance to sliding is largely dependent on the shapes and configurations of vertical joints and the vertical loads of horizontal joints. In this paper, the shear strength by the difference of relative strength between panel and joint, the effect of reinforcement, and the effect of vertical load are considered.

• 한국구조물진단유지관리공학회 논문집
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• 제19권4호
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• pp.1-9
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• 2015

본 연구는 철근콘크리트 기둥과 철골보로 이루어진 RCS합성구조에서 내부접합부의 전단강도에 관한 연구이다. 새로운 건물 구조시스템인 합성구조 시스템은 철근콘크리트 기둥과 철골보의 장점을 최대한 살린 구조로서 경제적, 실용적인 접합부 상세들이 많이 개발되어 왔다. 그럼에도 불구하고 접합부에 대한 구조적 거동 및 응력전달기구가 명확히 밝혀지지 않고 있으며 여전히 제안된 식들로부터 많은 차이를 보이고 있다. 따라서 본 연구에서는 접합부에서 철골보가 철근콘크리트 기둥을 관통하는 보 관통형 RCS 구조체를 대상으로 하여 기존의 전단파괴 실험체 37개를 접합부 형태에 따라 기존에 제안된 5개의 주요식들에 적용하였다. 회기분석을 통한 각 제안식의 신뢰성을 검증하였고, 기존식들의 단점을 보완할 수 있는 전단강도 추정식을 제안하였다.

• 대한건축학회논문집:구조계
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• 제35권9호
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• pp.151-158
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• 2019

A concrete core is used widely as lateral stability systems in high-rise modular buildings. As an alternative to traditional cast in-situ core, the precast concrete(PC) method can accelerate the construction of reinforced concrete cores. A core composed of precast elements differs from a in-situ core in having connections between the precast elements. The typical vertical connection between PC panels is consisted of shear keys, loop bars, lacer bars and grout. In this study, the effect of vertical connection components on shear strength is investigated experimentally. The test results show that the contribution to the shear strength is greater in order of grout strength, shear keys, lacer bars and loop bars. In addition, the numerical models to estimate the shear strength according to two crack patterns in the vertical joint of the PC panels are derived. The feasibility of the numerical models is evaluated by comparing the estimated shear strength and the test results.

• 한국생산제조학회지
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• 제8권6호
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• pp.113-118
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• 1999

In order to evaluate strength of spot welded joint, at first it is importent that we should know strain distribution near nugget zone. During loading, in HAZ, compressive strain increase with Increase of load, but in nugget zone tensile strain increase. During unloading, on the other hand, even through the decreases, the strain variation is not almost appeared in nugget zone and HAZ. In nugget boundary zone, the strain range increases continuously along with load increase on outer surface, but the strain increases continunously and decreases rapidly beyond yield strength on inner surface. In this paper, strain distribution are measured in inner and outer surface with variation of thickness and load under tensile-shear load. Tensile-shear strength increased as with increase of specimen thickness. As for thickness increase rates are 25%, 50%, 100%, and 150%, tensile-shear strength in crease rates are 40%, 81%, 130% and 228%.

• 한국안전학회지
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• 제19권2호
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• pp.125-129
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• 2004

수화열에 의한 균열은 대규모 콘크리트 타설시 흔하게 접하는 문제이며 이에 대한 해결은 시공이음을 만드는 것이다. 일반적인 방법으로 접합면을 할석으로 처리 하나 이 작업은 번거롭고 품질의 일관성을 유지하기 쉽지 않다. 본 연구에서는 접합면을 3가지 방법으로 처리하여 접합면의 전단강도를 비교하기 위한 18개의 시험체에 대한 push-out실험을 수행하였다. 할석으로 접합면을 만든 시험체에 비해 리브라스를 이용한 시험체가 전단저항에 월등한 성능을 보여 주었으며 그리고 리브라스를 절곡하여 만든 전단키가 전단저항을 향상시키는데 큰 역할을 하였다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 춘계학술대회 논문집
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• pp.517-520
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• 2008

Recently, use of adhesive bonding technology is increased to achieve the multi-material design for lightweight structure in automobile industry. In this paper, the fracture strength of adhesive has been studied with the single lap shear test conducted at different temperatures. The joint specimens are made from Al 5052 and SPRC 440 bonded with structural epoxy adhesive. The operating temperature has been considered up to $150[^{\circ}C]$ and the single lap shear test has been conducted with 5mm/min tensile rate. Fracture strength of adhesive bonded joint has been decreased with increase of operating temperature. The fracture strength at the $100[^{\circ}C]$ was shown about half of that at room temperature.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 봄 학술발표회 논문집
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• pp.471-477
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• 1999

A new stress, load and displacement controlled direct shear apparatus has recently been developed at the Hyundai Institute of Construction Technology This direct shear apparatus is capable of testing of rock joint under constant normal stiffness, constant normal stress or constant normal load boundary conditions. This paper describes this direct shear apparatus and illustrates results of shear tests at constant normal stress condition, constant normal load condition and constant normal stiffness condition with dental stones which have a same joint roughness and unconfined compressive strength.

• 한국강구조학회 논문집
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• 제25권6호
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• pp.623-634
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• 2013

본 연구에서는 RC 구조 슬래브와 SC 구조 전단벽이 만나는 접합부의 거동특성을 파악하고 RC구조 슬래브-SC구조 전단벽 이질접합부의 전단마찰내력을 평가하고 KEPIC SNG의 접합면 소요전단강도 기준의 안전율을 평가하기 위해 실험연구를 수행하였다. 연구결과, 접합면의 전단마찰내력은 약 300kN으로 나타났고, 변위가 증가할수록 철근의 내력분담이 증가하게 되며, 상부철근보다는 하부철근의 전단내력 분담율이 높은 것으로 나타났다. 하부철근을 구성한 경우에는 하부철근이 없는 실험체에 비해 40% 이상 전단내력이 증가하는 것으로 나타났다.