• Title/Summary/Keyword: Strength strengthening

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The Influence of Muscle Strengthening Exercise and Stretching Exercise of Trunk Extensor Muscles on Muscular Strength and Flexibility in Adolescent of the Twenties (체간신전근의 근력강화운동과 신장운동이 20대 청소년의 근력 및 유연성에 미치는 영향)

  • Kim, Sang-Soo;Lee, Woo-Hyung;Song, Myung-Soo
    • PNF and Movement
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    • v.8 no.1
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    • pp.1-10
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    • 2010
  • Purpose : This study aimed to examine the Influence of muscle strengthening exercise and stretching exercise of trunk extensor muscles on muscular strength and flexibility in adolescent of the twenties. Methods : Muscle strengthening exercise group(n=10), stretching exercise group(n=10) and strengthening and stretching exercise group(n=10) were measured muscular strength by digital back and leg dynamometer and flexibility by sit and reach test and trunk extension test at pre-intervention and post-intervention in 4weeks. Results : The flexibility 1, flexibility 2 and muscular strength of muscle strengthening exercise group were significantly increased within the intervention period(p<.05). The flexibility 2 and muscular strength of stretching exercise group were significantly increased within the intervention period(p<.05). but flexibility 1 was not significantly different at in 4 weeks(p>.05). The flexibility 1, flexibility 2 and muscular strength of muscle strengthening and stretching exercise group were significantly increased within the intervention period(p<.05). Conclusion : We were found that muscle strengthening exercise and stretching exercise of trunk extensor muscles could improve muscular strength and flexibility for adolescent of the twenties.

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Evaluation of Strengthening Capacity of Axial Member Using Admixture-Modified Mortar (혼화재 첨가 모르터를 이용한 압축부재의 보강성능 평가)

  • 박준명;양동석;박선규
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.417-422
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    • 2002
  • Strength and Durability of reinforced concrete exposed at deteriorated environment are decreased by cover spatting and corrosion of reinforcement. The purpose of this paper is to evaluate capacity of strengthening axial member using admixture-modified mortar. To investigate the capacity of strengthened axial member, behavior and strength of strengthening specimens were compared with a monolithic basic specimen. Admixture-modified mortar was prepared with silica fume, zeolite, polymer as cement modifier. From the result of this experiment, strengthening specimens using polymer-modified mortar have apparrent strengthening capacity because of good flexural strength and tensile strength.

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Determination of Nominal Moment of Strengthening Beam with Carbon Fiber Sheets Using Strength Method (강도설계법으로 산정된 탄소섬유시트 보강 철근콘크리트 보의 공칭 휨모멘트)

  • 조백순;정진환;김성도;박대효;이우철
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.10a
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    • pp.593-598
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    • 2002
  • Routinely, strength method for the determination of the nominal moment of reinforced concrete beam is assumed to also be suitable for strengthening beams with carbon fiber sheets since typically strengthening beams compromise 98% by volume of reinforced concrete. Flexural capacity of strengthening beam is absolutely dependent upon the type of reinforcement materials, amount of reinforcement, anchoring system, adhesion capacity between reinforcement material and concrete. Therefore, it might be incorrect to use strength method for analysis and design of strengthening beam without considering the differences in the load-deflection curves, mechanism of failure, state of stress distribution, failure strain of the reinforcement. An flexural analysis based on force equilibrium and strain comparability has been developed for strengthening beam. Systematic experimental investigations are compared with analytical results. Then, the adaptation of strength method for strengthening beam have also been discussed.

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A Study on the strengthening of titania ceramic coating layer on the steel substrate (티타니아 세라믹 熔射皮膜의 强度向上에 관한 硏究)

  • 김영식
    • Journal of Welding and Joining
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    • v.10 no.4
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    • pp.181-189
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    • 1992
  • The purpose of this investigation is to examine the effects of the strengthening treatments on the mechanical properties of the flame-sprayed titania ceramic coating layer. The strengthening treatments for flame sprayed specimens were carried out in 12 different conditions in vaccum furance. The mechanical properties such as microhardness, thermal shock resistance, adhesive strength and erosion resistance were tested for the sprayed specimens after strengthening treatments. And it was clear that the mechanical properties of coating layer were much improved by the strengthening treatments. The results obtained are summarized as follows; 1. It was shown that the metallurgical bond was formed between substrate and coating layer by the strengthening treatments and that thermal shock resistance and adhesive strength were remarkably raised. 2. Microhardness of coating lay was considerably increased by the strengthening treatments. 3. Erosion resistance and porosity of coating layer were slightly improved by the strengthening treatments.

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A Development on Method of Strengthening Design for the Different Status of Damages (손상상태를 고려한 부재의 보강설계법 개발)

  • 한만엽;이성준
    • Journal of the Korea Concrete Institute
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    • v.12 no.1
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    • pp.69-77
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    • 2000
  • Recently, many strengthening methods are developed to repair damaged structures, when the original structure is under loading, which causes the difference of initial stresses between original member and bonded material. However, current design method or theory, which mostly depends on ultimately strength design, cannot account the difference of initial stresses between members, and it disregards the reduction of nominal strength. In this study, a new strengthening design theory and the amount of strengthening which can account the difference of initial stresses are developed, and applied to the case when a structure in service is repaired. The results show that the amount of strengthening material depends on the status of damages of structure, and the nominal strength is reduced depending on the degree of damages.

CFS Strengthening Effect of Reinforced Concrete Beams under Loading States (재하상태에 따른 철근콘크리트 보의 탄소섬유쉬트 보강효과)

  • 김민수;오용복;권영웅
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.757-762
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    • 2000
  • The target of this study is to compare and analyze the strengthening effect of damaged reinforced concrete beams under unloading and loading conditions through the simulation of strengthening condition in real structures. The conclusion of test results are as follows : For the concrete beam wrapped at the side in addition to be strengthened at the bottom, the strength and stiffness increase. although the flexural capacity depends on the strengthening method, it generally shows that the strength improve in the range of 22% to 39% in comparison with the specimen without strengthening. In case of applying th equation suggested by CangaRao & Vijay for the wraped concrete beam, it must be modified because it is likely to overestimate the flexural capacity considering the height of wrapping as the width of concrete. The strength an stiffness of reinforced concrete beams in proportion to the percentage of damage decrease. Damaged beams, which are strengthened by CFS, is structurally efficient and show reduction of strength comparing with the specimen without strengthening but stiffness is increasing.

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A Study on Strengthening Exercise for Stroke Patients through Comparison of Literature between Domestic and Foreign (국내·외 문헌적 비교를 통한 뇌졸중 환자에 대한 근력강화 운동의 고찰연구)

  • Oh, Taeyoung
    • Journal of The Korean Society of Integrative Medicine
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    • v.7 no.1
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    • pp.113-124
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    • 2019
  • Purpose : The purpose of this study is to investigate the effect of strengthening program for improving the muscle strength and body function in rehabilitation of patients with stroke Methods : We found the 15 precedent studies at online portal site of "Korea education and Research information service" and found 5 precedent studies at "Pubmed". We analyzed and describe the total 19 studies involving national and international research. Results : The strengthening exercise was adapted to lower extremities and trunk muscle of participants and the isokinetic (concentric and eccentric) exercise was most of exercise type and then manual isometric exercise, functional activities, progressive task oriented resistance exercise, PNF pattern exercise was following. The studies reported that the strengthening program increased target muscle strength and improved balance capacity and walking function for the participants positively. Conclusion : Conclusionally the several strengthening program can be the intervention to increase the muscle strength without increasing spasticity for patients with stroke. We think that the strengthening of lower extremities an improve balance capacity and walking ability and it can use the intervention to change the quality of life in patients with stroke. More than 3weeks strength program might be effectiveness, in case of acute patients with stroke, the improving of muscle strength is available but need to study for improving balance and walking capacity more in the future.

Study on the mechanical Properties of Carbon Fiber Sheet (탄소섬유쉬트의 재료 역학적 특성에 관한 연구)

  • 이한승
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10b
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    • pp.803-808
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    • 1998
  • As carbon fiber is a light-weight materials, high tensile strength and durability compared with rebar, the retrofitting method for RC structures using carbon fiber sheet (CFS) must be use widely. In this paper, the tensile strength test for carbon fiber sheet variable of CF's weight and elastic modulus to evaluate the design tensile strength of carbon fiber sheet which is needed for the strengthening design of CFS and the calculation of strengthening effect. As a result, the design tensile strength of CFS can be calculate using the effect coefficient of strengthening(α) of CFS, the average tensile strength of CFS and the standard deviation of CFS(equation 5)

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Effects of Gluteus Medius Strengthening Training Using Sling on Ankle Instability, Muscle Strength, Balance in Adults in Their 20s with Chronic Ankle Instability (슬링을 이용한 중간볼기근 강화훈련이 만성 발목 불안정성을 가진 20대 성인의 발목 불안정성, 균형, 근력에 미치는 영향)

  • Jeong, Jong-Hyo;Kim, Ho;Shin, Won-Seob
    • Journal of The Korean Society of Integrative Medicine
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    • v.10 no.4
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    • pp.57-69
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    • 2022
  • Purpose : The purpose of this study was to investigate the effect of ankle strengthening exercise combined with sling-assisted gluteus medius strengthening on ankle instability score, and static and dynamic balance ability, muscle strength in adults in their 20s with chronic ankle instability. Methods : Twenty-eight adults in their 20s with chronic ankle instability were recruited. After screening test, they were randomized through R studio program as an experimental group (n=14) to apply an ankle strengthening exercise combined with sling-assisted gluteus medius strengthening and a control group (n=14) to apply ankle strengthening exercise. The intervention lasted two times a week for 6 weeks. To compare the intervention effects, the Cumberland ankle instability tool (CAIT) score, static and dynamic balance ability, and muscle strength of lower extremities were measured. Results : The experimental group showed a significant increase in pre and post-intervention Cumberland ankle instability tool (CAIT) score, static and dynamic balance ability, and muscle strengt (p<.05). The control group showed a significant increase in pre and post-intervention CAIT score, dynamic balance ability, and muscle strength (p<.05). The experimental group showed a significant increase in CAIT score, dynamic balance ability, and muscle strength compared to the control group (p<.05), and showed a high effect size. Conclusions : The results of this study confirmed that ankle strengthening exercise combined with sling-assisted gluteus medius strengthening on people with chronic ankle instability the possibility that it could be effective in improving ankle instability and improving dynamic balance ability, and strength by movement. Although additional research is needed to increase the number of participants due to the small sample size, it is hoped that this study will be an optimistic clinical protocol for people with chronic ankle instability.

A Study to Improve Bonding Strength with Notch in Strengthening Plate (노치를 이용한 보강재의 부착력 증가 방안에 관한 연구)

  • 한만엽;송병표
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.04b
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    • pp.647-652
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    • 1998
  • Recently, many strengthening methods are developed and used to rehabilitate existing structure. One of the popualr methods is the strengthening with steel plate. But steel plate have a defect that is a debondig at the end of the steel plate due to stress concentration. The objective of this paper is an experimental study for improving bonding properties of a strengthening plate. The two normally reinforced beams and ten strengthened beams steel plate, which has various notches were tested. The test results show that the notches of strengthening plate improve post-yield behavior significantly compared. It is proved that the notch in a strengthening plate increase of ulimate strength after the yield strength 9% more than ordinary strengthening method.

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