• Title/Summary/Keyword: Civil Movement

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Bulging of Reinforced Retaining Walls (보강토옹벽의 배부름에 관한 실험적 연구)

  • Ju, Jae-Woo;Park, Jong-Beom;Na, Hyun-Ho
    • Journal of the Korean Geosynthetics Society
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    • v.10 no.2
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    • pp.45-53
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    • 2011
  • Recently reinforced retaining walls secure their position as a stabilized method of construction replacing concrete retaining walls gradually. However, in the event of using extensible reinforcement, a bulging phenomenon can be happened in the front of reinforced retaining walls. Bulging of reinforced retaining walls means a phenomenon that, in the height of an arbitrary block, the upper part and the lower part of the block don't secure a relative position in design. Therefore, it is judged that it has the necessity to be examined in design since reinforcement needs metamorphosis to some degree to display tensile force. Therefore, the study examined about how extensibility of reinforcement had an effect on movement of reinforced retaining walls through a small-scale model test with aluminum rods. The study used Changhoji(traditional korean paper made from mulberry bark) as inextensible reinforcement and membrane as extensible reinforcement. As the result of the test, rigidity of reinforcement had a lot of effects on displacement of reinforced retaining walls and generally occurrence point of the maximum horizontal displacement had a tendency transferring to the upper part of walls according to rigidity of reinforcement was increased.

A Study of Theoretical Method and Application to Laboratory Tests for Three-dimensional Transient Seepage Analysis (삼차원(三次元) 침투류해석(浸透流解析)을 위한 이론적(理論的) 방법(方法)과 실험적용예(實驗適用例)에 관(關)한 고찰(考察))

  • Jin, Byung Ik;Kim, Jae Hong
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.4 no.2
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    • pp.13-24
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    • 1984
  • The main part of this thesis deals with a three-dimensional transient seepage flow, discussing its fundamental conception into Which the mathematical analysis was introduced based upon the finite element method, propriety of geometrical analysis and flow movement of seepage water. As is commented in the body of the report, the saturated-unsaturated method with respect to the free water surface method is revealed to have the relative merits and demerits. Generally, the unknown sections in the form of free water surface matters in case that tunnels or pores appear. On the other hand, the applicable range is quite large and variable to the methods accordingly. Also, an example as to the seepage analysis in the rock bed section is described. An unfavorable time-consuming problem is inevitale because the complicated and widely multifarious joints and faults are responsible for the intensity of seepage flow.

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Behavior Analysis by Verticality Error of Monopile Foundation for 5MW Offshore Wind Turbine (5MW급 해상풍력발전기 모노파일 기초의 수직도 오차에 따른 거동 분석)

  • Jang, Hwa Sup;Kim, Ho Sun;Eum, Hark Jin;Kim, Mann Eung
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.32 no.2C
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    • pp.61-68
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    • 2012
  • In general, verticality error necessarily occurs in marine pile foundation due to construction error or marine environmental effects. In marine structure, design by vertical load rather than horizontal load is dominant, but in the offshore wind turbine foundation, horizontal load is dominant. As the structure type that has dynamic movement by blade rotation, verticality error may have structurally significant effects. In this study, structural response feature of foundation and ground were analyzed according to verticality error of monopile foundation of 5MW offshore wind turbine. Marine environmental load was calculated per ISO standard and the margin of verticality error was calculated to be $L/{\infty}$(=0), L/300, L/200 and L/100. As a result of analysis, it was found that the maximum value of member force of the foundation with L/100 error increased about 7.2% compared to the monopile without verticality error.

Capacity and Saturation Flow Rate of Permissive Left-Turn Lane: in case for the Exclusive Use of Permissive Left-Turn Movements (비보호(非保護) 좌회전(左回轉)의 간격수락(間隔受諾)과 용량(容量) 및 보정계수(補整係數)에 관한 연구)

  • Do, Cheol Ung
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.14 no.6
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    • pp.1273-1279
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    • 1994
  • There are 3 cases that only permissive left-turn(PLT) vehicles use the possible lane for PLT. In these cases, left turn and through movements can not be included in the same lane group, hence saturation flow rate and left turn adjustment factor of PLT are obtained separately from through movement. In capacity analysis procedures at signalized intersection with PLT phasing, PLT capacity should be known to discriminate among 3 cases stated above. The capacity is directly used not only to get saturation flow rate and left turn adjustment factor, but as a threshold for the feasibility of PLT control. This study calculated through field data the critical gap and minimum headway of left turn which affect the PLT capacity. The capacity was obtained by using theoretical models, which consequently could be used to calculate the saturation flow rate and left turn adjustment factor.

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Development of Korean Life Cycle Cost Analysis Model for Road Pavement Asset Management (도로포장자산관리를 위한 한국형 생애주기비용 모형 개발)

  • Han, Daeseok;Do, Myungsik
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.33 no.4
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    • pp.1639-1650
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    • 2013
  • Road pavement management is an important activity that affects to national economy, movement and safety of people, and also demands huge amount of budget. Therefore, its management strategy must be established under objective information. In addition, decision support system that produces the management strategy needs to consider practical benefits from various aspects. Considering these aspects, this paper aimed to develop a customized Korean life cycle cost analysis model estimating various effects on road users and socio-environmental costs based on pavement condition. The suggested LCCA model focused on Korean national highway, and tried to adopt a national guideline recommended by Korean government for securing credibility of estimation results. In the development processes, some of the suggestions that do not fit well in the situations of pavement management field were added, altered, or partially modified. These attempts to develop customized asset management system would be an important step to break away from passive attitudes relying on ready-made software, but also to improve awareness about the social benefits from the better maintenance strategy.

A Geopolitical Approach of Transfrontier Peace Park in Southern Africa : Implication for the DMZ International Eco-Peace Park (남부아프리카 초 국경평화공원의 지정학적 접근: DMZ 세계생태평화공원 조성에 주는 시사점)

  • Moon, Nam Cheol
    • Journal of the Korean association of regional geographers
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    • v.23 no.2
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    • pp.311-324
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    • 2017
  • This study has the purpose of geopolitical analysis on the role, function and problem of (trans) frontier park in Southern Africa. Frontier parks in Southern Africa had been used as a buffer zone between colonial empires and British colonial administration during the colonial period and as an interdiction zone of communism and black liberation movement during the apartheid regime, the cold war and the civil war. The ecological transfrontier peace parks in Southern Africa which is integrating the adjacent Frontier parks is utilized as a means of a conflict resolution and peace building after the end of cold war, civil war and apartheid regime, The ecological transfrontier peace parks in Southern Africa is very highly regarded as an effective means for a conflict resolution and peace building. But it is also being criticized for a reproduction of South Africa's politico-economic domination and of a socio-spatial division between racial groups.

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A Tidal Model of the Arabian Gulf (아라비아만(灣)의 조석(潮汐)모델)

  • Choi, Byung Ho
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.8 no.2
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    • pp.67-76
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    • 1988
  • A fully non-linear two-dimensional model for studying basic tidal dynamics within the Arabian Gulf has been formulated. The model extends to the east as far as continental shelf edge and has a mesh resolution of 1/12 degree latitude by 1/10 degree longitude. The developed model was used to investigate the distribution of dominant $M_2$, $S_2$, $K_1$, $O_1$ and $N_2$ tides adopting the open boundary tidal information from Schwiderski's global ocean tidal model. Computed co amplitude and cophase charts were presented independently and comparison between these charts and existing Admiralty tidal charts were made. Maximum bottom stress vector during the semidiurnal period due to $M_2$ and $M_4$ tides are also presented to suggest the possible direction of sediment movement in the region.

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Analysis of Dynamically Penetrating Anchor based on Coupled Eulerian-Lagrangian (CEL) Method (Coupled Eulerian-Lagrangian (CEL) 방법을 이용한 Dynamically Penetrating Anchor의 동적 거동 분석)

  • Kim, Youngho;Jeong, Sang-Seom
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.34 no.3
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    • pp.895-906
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    • 2014
  • A fundamental study of the dynamically penetrating anchor (DPA - colloquially known as torpedo anchor) embedded into deep seabed was conducted using measurement data and numerical approaches. Numerical simulation of such a structure penetration was often suffered by severe mesh distortion arising from very large soil deformation, complex contact condition and nonlinear soil behavior. In recent years, a Coupled Eulerian-Lagrangian method (CEL) has been used to solve geomechanical boundary value problems involving large deformations. In this study, 3D finite element analyses using the CEL formulation are carried out to simulate the construction process of dynamic anchors. Through comparisons with results of field measurements, the CEL method in the present study is in good agreement with the general trend observed by in-situ measurements and thus, predicts a realistic large deformation movement for the dynamic anchors by free-fall dropping, which the conventional FE method cannot. Additionally, the appropriate parametric studies needed for verifying the characteristic of dynamic anchor are also discussed.

Evaluation of Anti-Stripping Performance in Asphalt Concrete using Byproduct Ash produced from Circulating Fluidized Bed Boiler (보일러 부산 애쉬를 이용한 아스팔트 콘크리트의 박리저항성 평가)

  • Kim, Yooseok;Kim, Nakseok
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.38 no.2
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    • pp.319-325
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    • 2018
  • Pot-holes are steadily increasing due to abnormal climate such as heavy rainfall and frequent snowfall. Pot-hole related to traffic accidents cause injuries, car damage and distress of road facilities. To reduce pot-holes, the use of an anti-stripping agent is mandatorily recommended to asphalt concrete mixture. Hydrated lime is commonly used as anti-stripping agent due to the convenience and economics. Byproduct ash from circulating fluidized bed boiler was reviewed as an anti stripping agent. According to the test results, the byproduct ash is satisfied with TSR specification using 1% to 3% by weight of the asphalt mixture. The byproduct ash was examined under various condition changes of aggregate and asphalt concrete mixture considering quality movement. According to the results, using the byproduct ash was measured average 0.87 of TSR and coverage rates of 60% after rolling bottle test. Test results also revealed that the byproduct ash showed stable performance. Using the byproduct ash to decrease pot-hole in asphalt concrete pavement is suitable for demonstrating stable performance as anti-stripping agent.

Community Vitality of Learning City through the use of Unused Facilities in the Elementary School - Focused on Busan - (유휴시설 활용을 통한 학습도시형 커뮤니티 활성화 연구 - 부산광역시를 대상으로 -)

  • Park, Jong Min;Kim, Jong Gu;Kang, Youn Won
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.38 no.1
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    • pp.141-148
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    • 2018
  • In recent years, there has been a movement to create a learning city where people can learn and enjoy what they want whenever, wherever, and whenever, so that the self-realization of individuals and the quality of life can be enhanced to improve the competitiveness of the city as a whole, It is becoming active. Many developed countries in the world are supporting projects to build learning cities by utilizing schools and public facilities, thereby providing local residents with opportunities for self-growth and solving community problems. In Korea, too, there are various programs using idle facilities. However, there is a lack of education programs for local residents and learning programs by partnership with local communities. It is when spatial and software strategies are needed to build a successful learning city. Therefore, we want to systematically organize the spatial data of the facilities that can be learned, analyze the current problems, and explore various ways to utilize them. We also analyze the programs that residents need to implement real and efficient learning cities.