• Title/Summary/Keyword: Concrete pole

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Stress Analysis Acting on Electric Pole using Strain Gauge from Full Scale Pull-Out Test (실물인장실험시 변형률계를 이용한 전주에 작용하는 응력분석)

  • Ahn, Tae-Bong
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.9
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    • pp.49-55
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    • 2010
  • Many electric poles in the softground have been collapsed due to external load. In this study, 10 types of tests were performed with variation of location, numbers and depths of anchor blocks as well as depth of poles to find stresses acting on concrete electric poles. The stresses of concrete poles are relaxed at 600~700[kg] of tensile load, and stresses are concentrated at top of pole, and spread to lower part of pole. In the concrete pole collapse test, tensile load at failure was approximately 1,400[kg], which is twice of design load. As passive zone in the soil increases, the stresses acting on concrete pole are concentrated at lower part of pole based on moment arm earth pressure distribution.

Analysis of Electrical Resistivity Characteristics of Concrete by Using Flat Electrode Method (평판접지 전극방법을 이용한 콘크리트의 전기비저항 특성 분석)

  • Park, Chang Seon;Park, Hae Won;Lee, Kang Hun;Jeong, Jin Hoon
    • International Journal of Highway Engineering
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    • v.19 no.3
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    • pp.57-63
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    • 2017
  • PURPOSES : The pole electrode method damaged the concrete pavement on inserting the electrode into the pavement surface. This study examined the feasibility of the flat electrode method to observe the concrete pavement instead of the pole electrode method and analyzed the resistivity characteristics of the concrete by performing laboratory tests. METHODS : The resistivity of the concrete specimens manufactured with three different mixing ratios (38.50%, 39.50%, and 40.50%) were measured using the pole and flat electrode methods according to the concrete age (7 and 28 days) and electrode spacing (20 mm, 30 mm, and 40 mm). RESULTS :In both pole and flat electrode methods, the resistivity increased with increasing fine aggregate proportion regardless of the concrete age. The resistivity measured at a concrete age of 28 days was slightly larger than that measured at 7 days. In the case of a concrete age of 7 days, the resistivity measured by the flat electrode method was larger than that measured by the pole electrode method. The difference disappeared at 28 days. CONCLUSIONS :The results suggest that the flat electrode method can replace the pole electrode method because the resistivity measured by both methods was similar. Hence, the development of a technology to apply the flat electrode method to actual concrete pavement is necessary.

Research of Stresses Distribution and Loading Weight on Concrete Electric Pole Considering Field Condition (설치조건을 고려한 배전용 콘크리트전주의 응력분포 및 하중에 관한 연구)

  • Kim, Dong-Myung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.5
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    • pp.183-188
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    • 2004
  • A method of double-pole construction is developing to strengthen the mechanical intensity of the electric poles. Therefore the mechanical properties of the double-pole were researched in this paper. First, considering field special quality electric poles were established. In the next tensile force was applied and stress distribution and fatigue load were examined. When a base of the pole is concrete, mechanical intensity of the double-pole increased about 1.7 times compared a single pole. In the case of general soil base, the concrete base should be needed to expect the reinforcement effect of the double-pole.

Research of stresses distribution and loading weight on concrete electric pole (배전전주의 응력분포 및 하중에 관한 연구)

  • Kim, Dong-Myung;Kwon, Tae-Ho;Song, Il-Kweon;Lee, Byeong-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.249-251
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    • 2005
  • A method of double-pole construction is developing to strengthen the mechanical intensity of the electric poles. Therefore the mechanical properties of the double-pole were researched in this paper. First, considering field special quality electric poles were established. In the next tensile force was applied and stress distribution and fatigue load were examined. When a base of the pole is concrete, mechanical intensity of the double-pole increased about 1.7 times compared a single pole.

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Stress Analysis in Nodal Zone by using Complementary Pole Method (Complementary Pole을 이용한 Nodal Zone의 응력해석)

  • Kang, Sung-Hun;Hong, Sung-Gul
    • Proceedings of the Korea Concrete Institute Conference
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    • 2010.05a
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    • pp.53-54
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    • 2010
  • This study investigates stress analysis in nodal zone by using Complementary Pole Method (CPM). The CPM is convenient tools for the stress or strain analysis since it enables to express parallel directions of the normal stress or strain on the Mohr Circle. In this study, it is suggested to use of CPM to analysis stress or strain in the field of Concrete Plasticity.

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An Experimental Study on the Fundamental Properties of Electric Pole Recycled Aggregate(EPRA) and Characteristics of High Strength Concrete by Replacement Ratios of EPRA (폐전주 재생골재의 기초물성 및 대체율에 따른 고강도영역 재생골재 콘크리트의 특성에 관한 실험적 연구)

  • 이강우;이종호;강석표;최세진;최희용;김무한
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.05a
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    • pp.495-500
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    • 2001
  • In this study, it was analized and examined fundamental properties of Electric Pole Recycled Aggregate(EPRA) and hardened properties & chemical resistance with H$_2$SO$_4$by replacement ratios of EPRA, and the results are as follows 1) In the case of electric pole recycled coarse aggregate, All fundamental properties are better than that of normal recycled aggregate and both water absorption and amount of crushed loss are with level of natural aggregate 2) As the replacement ratio of electric pole recycled fine aggregate is increased strength development is decreased. but in the case of coarse aggregate, that of it is with level of natural aggregate 3) As the replacement ratio of electric pole recycled fine aggregate is increased chemical resistance is decreased. but in the case of coarse aggregate, that of it is with level of natural aggregate

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An Experimental study on evaluation of reinforcing installation increasing the penetration depth about upset of concrete pole (콘크리트 전주의 근입깊이 증대를 위한 보강장치의 실험적 성능평가)

  • Shin, Dong-Geun;Yoon, Ki-Yong;Lee, Seung-Hyun;Lee, Gyu-Se;Kang, Young-Jong
    • 한국방재학회:학술대회논문집
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    • 2008.02a
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    • pp.71-74
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    • 2008
  • For reinforcing the overturn of concrete pole instituted in slope ground and weak ground, in this paper, develop the reinforcing installation. The installation increase penetration depth and effect of increasing the penetration depth is verified by experimental paper of Lim, jong suk(2004). In this research, through the experiment of bending test using the reinforcing installation, evaluate the performance. In the result of experiment, concrete pole behave elastically in design load and all sample are safe up to failure load.

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Study on prestressed concrete beams and poles with cement replaced by steel dust

  • Sujitha Magdalene, P;Harishankar, S
    • Advances in concrete construction
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    • v.5 no.4
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    • pp.391-405
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    • 2017
  • Cement acts as the most important component of concrete as it binds and holds the concrete together. But it is one of the major $CO_2$ emitters all over the world, during manufacturing (900 kg of $CO_2$ per 1000 kg). Some of the modern construction methods aim at reducing the amount of usage of cement and came out with numerous solutions for replacement of the same. One such supplement in current trend is the Steel dust or the Electric Arc Furnace Dust (EAFD), which is a waste product from the electric arc furnace when the scrap metal is melted. When the concrete containing steel dust is exposed to atmosphere, the environmental oxygen and moisture play role to form rust and ultimately the member becomes harder. As Cement is the binder of conventional concrete, only certain percentage of the same could be replaced by the new material, steel dust. Tests were conducted for the 28 days cube strength of M45 grade (suitable for prestressing) concrete which has 0%, 10%, 20%, 30%, 40% and 50% steel dust instead cement. From the test, the optimum percentage replacement of steel dust was obtained, for which the beams and overhead poles were cast, prestressed and tested for the failure load and deflections. A conventional concrete beam and overhead pole were also cast, prestressed and tested to compare the results with those of the beam and pole that contained steel dust. The load vs. deflection plot and other results from the test is also discussed.

An Analytical Study on the Ultimate Strength of Concrete Poles (콘크리트 전주의 극한강도에 관한 해석적 연구)

  • Shin, Dong-Geun;Yoon, Ki-Yong;Lee, Seung-Hyun;Yi, Gyu-Sei;Kang, Young-Jong
    • Journal of the Korean Society of Hazard Mitigation
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    • v.7 no.5
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    • pp.19-25
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    • 2007
  • In this study, a program based on the P-M interaction curve is developed to calculate the nominal strength of concrete pole. Using this, it is verified to compare with previous studies and the nominal strength$(M_n)$ of concrete pole is calculated. It is less than the rupture strength$(M_r)$ of the design standard. Thus, to increase nominal strength, several parameters are selected like as size of tension and reinforced bars, position of those, number of reinforcement bars, thickness of concrete pole, and diameter of it. The effects of those are analysed in the study. It is supposed that section of concrete pole are satisfied rupture strength.

Lateral Displacement Analysis of Concrete Electric Pole Foundation Grounds (배전용 콘크리트전주 기초지반의 횡방향변위 분석)

  • Ahn, Tae-Bong
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.5
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    • pp.42-49
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    • 2009
  • The effects of various forces acting on concrete pole are analyzed using finite element method how the forces affect on ground displacement. The soil types, wind load location of anchor block embedded depth of pole, and distance between poles are varied to find out effects on lateral displacement. Anchor block is effective when it is located at 1/4 of embedded depth The displacement is decreases as elastic modulus increases. Concrete reinforcement for loosened ground is necessary for double poles because double poles cause large excavation. When embedded depth ratio decrease, lateral displacement increase as closer to ground surface. Large embedded depth is effective to reduce lateral displacement, and the distance between poles is not much large factor.