• Journal of Mechanical Science and Technology
• /
• 제15권7호
• /
• pp.823-830
• /
• 2001

The single fiber pull-out technique has been commonly used to characterize the mechanical behavior of fiber/matrix interface in fiber reinforced composite materials. In this study, an improved analysis considering the effect of thermal residual stresses in both radial and axial directions is developed for the single fiber pull-out test. It is found to have the pronounced effects on the stress transfer properties across the interface and the interfacial debonding behavior.

• 대한견주관절학회:학술대회논문집
• /
• 대한견주관절학회 2009년도 제17차 학술대회
• /
• pp.159-159
• /
• 2009

Repeated pulling-out of a suture anchor in the lateral row despite repeated attempts at insertion during a rotator cuff repair is not uncommon with the suture-bridge technique, especially in patients with osteoporosis. We describe a simple procedure for dealing with the pull-out of a PushLock anchor in the lateral row using a suture anchor with a suture eyelet during rotator cuff repair applying the suture-bridge technique.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2000년도 가을 학술발표회 논문집
• /
• pp.127-134
• /
• 2000

Soil nailing is in-situ ground improvement technique of reinforcing soils using passive inclusions for the purpose of slope stability. Also soil nailing, in general, was used and studied as a reinforcement technique at cut slope, but this paper presents the results of study for soil nailing application as a reinforcement technique at the banking over slided slope. In-situ pull-out tests of nails, instrumented with strain gauges, were performed to investigate the maximum pull-out load and to calculate the unit side resistance in each different layer. And the apparent average unit side resistance of this study was compared with that of other sites installed at cut slope.

• KCI Concrete Journal
• /
• 제11권3호
• /
• pp.181-189
• /
• 1999

An experimental study was performed on the Pull-out behavior of 90-deg standard hooks from the exterior beam-column connections. the effects of the number of hooked bars and fiber reinforcement of the joint area were investigated with the following conclusions : (1) Under the pull-out action of hooked bars. the damage and cracking of joint area the number of hooks pulling out from a joint increases; (2) Substitution of the transverse column (confining) reinforcement with steel fibers at the joint region effectively reduces the extent of cracking in exterior joints caused by the pull-out of hooked bars; (3) The pull-out strength and post-peak ductility of hooked bars are adversely influenced by the increase in number of hooks pulling out from an exterior joint. Current hooked bar anchorage design guidelines may be improved by considering the effect of the number of hooked bars on anchorage conditions at the exterior joints; and (4) The strength and ductility of hooked bars under pull-out forces are positively influenced by substituting the conventional confining reinforcement of exterior joints with steel fibers . The application of steel fibers to the exterior joints is an effective technique for improving the anchorage conditions of hooked bars, and also for reducing the congestion of reinforcement in the beam-column connections.

• 대한관절경학회지
• /
• 제9권1호
• /
• pp.40-45
• /
• 2005

목적: 본 연구의 목적은 내측 반월상 연골 후방 골 기시부 파열 환자의 임상적 특징과 골 기시부 봉합술 및 그 임상 결과를 알아보고자 한다. 대상 및 방법 2003년 9월부터 2004년 8월까지 본원에서 내측 반월상 연골 후방 골 기시부 파열로 진단받은 환자 27명을 대상으로 하였고 이 중 23명은 봉합술을 시행하였다. 평균 연령은 60.2세였다. 봉합술은 골 기시부 처리시 전외측 창을 이용한 1군(14예)과 후내측 창을 함께 이용한 2군(9예)으로 나누었다. 동반된 관절 연골 손상은 ICRS system을, 술 후 임상결과는 Lvsholm Knee Score를 이용하였다. 결과: 최종 추시상 Lysholm Knee Score는 1군이 77.1점(범위; $58{\sim}97$점), 2군이 81.4점(범위; $72{\sim}94$점)이었다(p>0.05). 봉합술이 실패한 경우는 23예 중 4예였다. 1군은 3예로 반월상 연골 부분 절제술로 치료하였으며 2군은 1예로 장력이 소실되었으나 관찰 중이다. 관절연골 병변은 20예에서 체중 부하 부위에 있었고 Outerbridge 분류상 III기 8예, IV기 5예였다. 결론: 내측 만월상 연골 골 기시부 파열에서 pull-out 봉합술이 원주 테 장력을 복원하고 관절염을 예방하는 데 유용한 치료라고 사료된다.

• 한국지반공학회논문집
• /
• 제34권11호
• /
• pp.5-19
• /
• 2018

지반앵커의 정착장에 작용하는 정착응력 분포 특성은 매우 비선형적이며 공학적인 메카니즘이 비교적 복잡하기 때문에 다양한 지반조건 및 비선형적 주면전단거동을 구체적으로 모사하여 지반앵커를 설계하는데 어려움이 크다. 이런 한계로 인하여 현재 대부분의 관련 설계 기준서에는 편의상 정착장 전장에 걸쳐 일정한 주면전단응력분포를 가정하여 설계에 적용하고 있다. 따라서 본 연구에서는 인장형 앵커의 인발거동 특성을 분석하기 위하여 풍화토 지반조건을 대상으로 현장인발시험을 수행하였으며 이를 토대로 앵커 정착장의 주면전단거동을 정립하고, 정착장 거동특성을 비교적 간편하게 예측하기 위한 다중선형모델 및 이를 적용한 해석적 기법을 제안하였다. 현장시험결과와 해석적 결과가 상호 유사하게 나타남에 따라 본 연구에서 제시된 다중선형모델 및 이를 이용한 해석적 기법의 적용성 및 유효성을 확인할 수 있었다. 정착장 주면전단거동의 경우 최대인발하중 보다 작은 하중조건에서는 정착장 시작점에서 최대전단응력이 분포하게 되나 최대인발하중이 발생한 이후부터는 정착장 시작점에서 전단응력이 가장 작게 분포하고, 정착장 시작점으로부터 일정거리 이격된 지점에서 최대전단응력이 발생함을 확인하였다.

• 대한기계학회논문집A
• /
• 제26권7호
• /
• pp.1384-1392
• /
• 2002

Single fiber pull-out technique has been commonly used to characterize the mechanical behavior of interface in fiber reinforced composite materials. An improved analysis considering the effects of transversely isotropic properties of fiber and the effects of thermal residual stresses in both radial and axial directions along the fiber/matrix interface is developed for the single fiber pull-out test. Although the stress transfer properties across the interface is not much affected by considering the transversely isotropic properties of fiber, interfacial debonding is notably encouraged by the effect. The interfacial shear stress that plays an important role in interfacial debonding is very much affected by the component of axial thermal residual stress in the bonded region, which can induce a two-way debonding mechanism.

• 대한관절경학회지
• /
• 제2권1호
• /
• pp.45-50
• /
• 1998

Recently, a variety of arthroscopic techniques have been reported for the treatment of the displaced tibial eminence fracture. The purpose of this study was to describe details of arthroscopic technique using pull-out wire and to evaluate the results. Eleven patients with irreducible type II and type III tibial eminence fractures underwent the arthroscopic reduction and internal fixation using double strand pull-out wiring. The anterior cruciate ligament tibial drill guide was utilized for the reduction of fracture and passage of the guide pins. The tibial eminence fracture was firmly fixed with double strand 26-gauge pull-out wire(0.45mm diameter). Fracture union was achieved at 7.2 weeks (range, six to eight weeks) after operation. All cases were united at the last follow-up. Subjectively, nine patients had no pain and no restriction of daily activities. Two patients with combined injuries had limitation of knee motion(10 to 130 degrees, respectively) and one patient showed mild anterior laxity. Early rehabilitation was enabled without loss of reduction and breakage of pull-out wire. The arthroscopic reduction and internal fixation using pull-out wire showed good results including early rehabilitation, early fracture union, minimal morbidity, and no requirement of the second operation for hard ware removal.

• 한국안전학회지
• /
• 제22권1호
• /
• pp.54-60
• /
• 2007

This paper describes typical design and construction practice for in-situ ground reinforcement technique using improved steel pipe pressure grouting. A case history is presented to illustrate the benefit gained by application of the technique. This technique was applied to cut slopes developed in the construction of auxiliary spillway of 00 dam. Applicable conditions, method of survey, slope stability analysis and construction are given in this parer. As for the construction method, a procedure is given and the main points are the control of construction work. As a result of the pull-out test, it is shown that seel pipe nailing is particularly useful for stabilizing rock slope.

• 한국구조물진단유지관리공학회 논문집
• /
• 제2권3호
• /
• pp.188-193
• /
• 1998

An experimental study was performed on the pull-out behavior of 90-deg standard hooks from exterior beam-column connections. The effects of lateral confinement and fiber reinforcement of joint area were investigated. It was concluded ; (1) Substitution of the transverse column (confining) reinforcement with steel fibers at the joint region effectively reduces the extent of cracking in exterior joints caused by pull-out of hooked bars; and (2) The strength and ductility of hooked bars under pull-out forces are positively influenced by substituting the conventional confining reinforcement of exterior joints with steel fibers. Application of steel fibers to exterior joints seems to be an effective technique for improving the anchorage conditions of hooked bars, and also for reducing the congestion of reinforcement in exterior beam-column connections.