• Title/Summary/Keyword: Static Strength Test

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The Effect of Progressive Resistance Training with Elastic Band on Grip Strength and Balance in Middle Elderly Women (중기 노인 여성의 점진성 저항운동이 악력과 균형에 미치는 영향)

  • Lee, Han Suk;Lee, Chun Hee
    • The Journal of Korean Physical Therapy
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    • v.25 no.2
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    • pp.110-116
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    • 2013
  • Purpose: This study was conducted in order to determine the physical effect on grip strength and balance ability of progressive resistance training using an elastic band for middle elderly women. Methods: We randomly recruited 13 middle elderly female subjects (from 75 years old to 84 years old). They practiced the elastic band exercise for 50 minutes once every week and were instructed to perform the same exercise as a home exercise for 16 weeks. Subjects who participated voluntarily had not participated in any other exercise program. Grip strength, one leg stance, and TIme Up & Go Test (TUG) were measured before and after elastic band exercise using the one group pre-posttest design. Wilcoxon's signed ranks test and simple regression analysis were performed using SPSS 18.0. Results: Significant differences in TUG and grip strength test scores were observed pre and post exercise (p<0.05), except one leg stance test. Significant correlation was observed only between age and change of right one leg stance. Conclusion: Progressive resistance training using an elastic band for middle elderly women was effective for dynamic balance and grip strength, but was not effective for static balance. Therefore, investigation of factors that affect improvement of static balance using an elastic band and the lasting duration of the effect and its association with age will be necessary in the future.

Fatigue Life Prediction of a Multi-Purpose Vehicle Frame (MPV 프레임의 피로수명 예측)

  • 천인범;조규종
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.5
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    • pp.146-152
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    • 1998
  • Recently, for the development of vehicle structures and components there is a tendency to increase using numerical simulation methods compared with practical tests for the estimation of the fatigue strength. In this study, an integrated powerful methodology is suggested for fatigue strength evaluation through development of the interface program to integrate dynamic analysis quasi-static stress analysis and fatigue analysis, which were so far used independently. To verify the presented evaluation method, a single and zigzag bump run test, 4-post road load simulation and driving durability test have been performed. The prediction results show a good agreement between analysis and test. This research indicates that the integrated life prediction methodology can be used as a reliable design tool in the pre-prototype and prototype development stage, to reduce the expense and time of design iteration.

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A Study on the Structural Strength of the Rolling Stock Seat Frame (유한요소해석을 이용한 철도차량 시트프레임의 정적 강도 평가에 관한 연구)

  • Koo, Jeong-Seo;Cho, Hyun-Jik
    • Proceedings of the KSR Conference
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    • 2003.10c
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    • pp.49-58
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    • 2003
  • In this paper, the structural strengths of a rolling stock seat were numerically evaluated under several design load conditions based on the UIC requirements. The rolling stock seat was designed for the high speed train of a Chinese conventional line. To maximize its weight reduction and structural strength, some aluminium alloys like 6N01-T5 and ALDC8-T5 were applied to the base frame, side frame and armrest. The designed seat frame satisfied the strength requirements on inertia loads due to accelerations, and fatigue test conditions. However, it violated the requirements on the static test of UIC 566 OR. Some design modifications were suggested and numerically evaluated to satisfy the static test requirements.

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Behavior Properties of Bridge by Non Destructive and Loading Test (비파괴 및 재하시험에 의한 노후 교량의 거동특성)

  • Min, Jeong-Ki;Kim, Young-Ik
    • Journal of The Korean Society of Agricultural Engineers
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    • v.46 no.1
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    • pp.61-71
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    • 2004
  • The performance evaluation and deflection of 3 spans concrete simplicity slab bridge analyzed by non-destructive and loading test. Compressive strength of slab and pier appeared in the range of each 353∼366 kgf/$cm^2$ and 152∼215 kgf/$cm^2$ in rebound number test. Also, it appeared that concrete quality of slab was good after performance improvement. The average compressive strength of slab by core picking appeared 229 kg/$cm^2$. In reinforcing bar arrangement test of span and member, it appeared that horizontal and vertical reinforcing bar was arranged to fixed interval. The value of calculation deflection that carried structural analysis with deflection analysis wave in static loading test appeared higher than that of experimental deflection and it appeared that hardness of this bridge was good. Maximum impact factor that estimated from deflection by running speed in dynamic loading test appeared by 0.216 in 10 km/hr running speed.

A Study on the Structural Analysis and Test of the Bogie Frame According to UIC Code (UIC code에 따른 대차 프레임 구조해석 및 시험에 관한 연구)

  • 최중호;송시엽;천홍정;전형용;박형순
    • Proceedings of the KSR Conference
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    • 2002.10b
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    • pp.884-891
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    • 2002
  • This report is the result performed the structural analysis and the static and fatigue load test of bogie frame for the purpose of designing and verifying the bogie frame which satisfy the load condition required in the UIC code. This investigation is proposed the efficient draft of the design to satisfy the load condition required in the UIC code. And It is performed the structural analysis to evaluate the static strength and the fatigue life of the patient material and the welded part. Also, This is proposed the efficient draft of the test to satisfy the method of the static and fatigue test required in the UC code. And it is carried out the static and the fatigue load test to verify it. We can designed the bogie frame in compliance with UIC 515-4 and 615-4 code.

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A Study on Strength Evaluation of Adhesive Joints(1st Report, Stress Analysis and Fracture Strength of Adhesive Single-Lap Joint) (접착이음의 강도평가에 관한 연구 (제1보 겹치기 접착이음의 응력해석과 파괴강도))

  • 정남용
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.4
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    • pp.667-674
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    • 1992
  • Recently advantages in composite and light weight material technique have led to the increased use of structural adhesives in various industries. In spite of such wide application of the adhesive joints, the evaluation method of fracture strength and design methodology of them, have not been established. In this study finite element method, theoretical and experimental analyses were investigated according to changes of lap length and adhesive for adhesive single-lap joint. As the results, the strength evaluation of adhesive joint by conventional nominal stress, was pointed out inadequate strength evaluation and design method regardless stress singularity, stress distribution and crack propagation in its adhesive layer. Also, it was examined the problems to apply fracture mechanics by means of static and fatigue test.

A Study on the Fatigue Strength of the Reinforced Concrete Beams Repaired with Glass Fiber Reinforced Polymer(GFRP) Bar and Glass Fiber Steel Plate(GSP) (GFRP Bar 및 GSP로 보수된 철근 콘크리트 보의 피로강도 연구)

  • Kim, Jae-Young;Kim, Chung-Ho
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.21 no.2
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    • pp.191-195
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    • 2009
  • After developing the pre-crack to simulate a damaged reinforced concrete beam, fatigue test was conducted on the beam repaired by GFRP Bar and GSP embedded method. In the result of fatigue test, most residual displacement and crack of the experimental beams occurs in the early loading cycle and an increasing rate of these due to number of cycles were insignificant. Comparing with a non-repaired beam, a static strength of the repaired beam greatly increased, but fatigue strength decreased. In S-N curves, fatigue strength of the beam repaired by GFRP Bar and GSP was 58%, 52% of the static strength respectively.

Static behaviour of multi-row stud shear connectors in high- strength concrete

  • Su, Qingtian;Yang, Guotao;Bradford, Mark A.
    • Steel and Composite Structures
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    • v.17 no.6
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    • pp.967-980
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    • 2014
  • In regions of high shear forces in composite bridges, headed stud shear connectors need to be arranged with a small spacing in order to satisfy the design requirement of resisting the high interface shear force present at this location. Despite this, studies related to groups of headed studs are somewhat rare. This paper presents an investigation of the static behaviour of grouped stud shear connectors in high-strength concrete. Descriptions are given of five push-out test specimens with different arrangements of the studs that were fabricated and tested, and the failure modes, load-slip response, ultimate load capacities and related slip values that were obtained are reported. It is found that the load-slip equation given by some researchers based on a single stud shear connector in normal strength concrete do not apply to grouped stud shear connectors in high-strength concrete, and an algebraic load-slip expression is proposed based on the test results. Comparisons between the test results and the formulae provided by some national codes show that the equations for the ultimate capacity provided in these codes are conservative when used for connectors in high-strength concrete. A reduction coefficient is proposed to take into account the effect of the studs being in a group.

A Study on Experimental of Two-spans Beam with Steel Fiber According to Repetitive Shear Stress (반복전단응력에 의한 강섬유 2경간 연속보의 실험적 연구)

  • Kwak, Kae-Hwan;Suk, In-Soo;Cho, Sun-Jung;Park, Jong-Gun
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2002.10a
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    • pp.181-184
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    • 2002
  • In this research, a basis test on steel fiber concrete's material property was carried out and optimum design as well as material property was examined. In corroboration of it, the compressive strength was compared with the tensile strength and this paper tried to get the initial load of flexural cracking and the ultimate load in the positive-negative moment section through the static test of beam. The addition rate of the steel fiber, 0.75 SFRC specimen was failed at $65{\sim}75%$ of the static ultimate strength and it could be concluded that fatigue strength to two million cycle was around 75.2%.

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Structural identification and seismic performance of brick chimneys, Tokoname, Japan

  • Aoki, T.;Sabia, D.
    • Structural Engineering and Mechanics
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    • v.21 no.5
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    • pp.553-570
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    • 2005
  • Dynamic and static analyses of existing structures are very important to obtain reliable information relating to actual structural properties. For this purpose a series of material test, dynamic test and static collapse test of the existing two brick chimneys, in Tokoname, are carried out. From the material tests, Young's modulus and compressive strength of the brick used for these chimneys are estimated to be 3200 MPa and 7.5 MPa, respectively. The results of static collapse test of the existing two brick chimneys are discussed in this paper and composed with the results from FEA (Finite Element analysis). From the results of dynamic tests, the fundamental frequencies of Howa and Iwata brick chimneys are estimated to be about 2.69 Hz and 2.93 Hz, respectively. Their natural modes are identified by ARMAV (Autoregressive Moving Average Vectors) model. On the basis of the static and dynamic experimental tests, a numerical model has been prepared. According to the European code (Eurocode n. 8: "Design of structures for earthquake resistance") non-linear static (Pushover) analysis of the two chimneys is carried out and they seem to be vulnerable to earthquakes with 0.25 to 0.35 g.