• 국제학술발표논문집
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• The 10th International Conference on Construction Engineering and Project Management
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• pp.137-144
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• 2024

Public infrastructure projects are implemented to achieve targeted economic development of nations. However, due to the delayed execution of projects, the investment cost of the project increases in proportion to time overrun. The increased investment cost for the defined scope of project may have an effect on the achievement of planned future benefits, but the effect of delay on the loss of estimated benefits is not well explored. The primary objective of this research is to assess the effect of delayed execution of road and bridge construction projects on the estimated future benefits. Furthermore, the relationship between delay and the percentage loss of future benefits is modeled using the linear regression analysis. The data consists of 395 road and 248 bridge construction contracts under the Department of Roads, Nepal. The statistical analysis of road and bridge construction contracts showed that there is a reduction in estimated benefits in future years due to the effect of delay. The relationship between the percentage loss of estimated benefit and delay period in months was found to be significant for both road and bridge contracts. The results show that delay not only affects the short-term cost overrun but also the achievement of estimated future benefits. This research thus contributes valuable insights into the understanding of the impact of project delays on both cost overruns and the loss of estimated future benefits. Furthermore, this research has practical implications for policymakers, private sector investors, and financing agencies involved in infrastructure development projects.

• 한국재난관리표준학회지
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• 제1권4호
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• pp.51-56
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• 2008

여름철에 연평균 강수량의 50%이상이 집중 발생하는 우리나의 기후로 인해 매년 수해로 수많은 교량들이 유실되어 도로 기능유지에 심각한 지장을 주고 있다. 우기 전에 복구공사를 완료하기 위해서 공기단축을 위한 급속시공 교량공법이 필요한 실정이다. 본고에서는 PSC거더 교량에 프리캐스트 바닥판을 적용하여 교량공사기간을 50%이상 단축시킨 교량가설 공법인 "Precast deck and PSC girder 시스템"에 대해서 설명하고, 이를 국도 제44호선 인제~양양 구간의 수해복구 공사 중의 한계2교에 적용한 시공사례를 소개하고자 한다.

• 산업기술연구
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• 제18권
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• pp.43-50
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• 1998

According to complexity and high level of society, the rapid and accurate information for landuse, environment and traffic etc., is required, but the information management by a drawing and a map is confronted with a complicated and sudden change of facilities such as bridge; electricities, city gases and networks. This paper is aim to build a bridge management system of road with GSIS. It operated personal computer will bring easy computing management system of bridge on road. To build this system, presented bridge management system and domestic method for bridge management of road are investigated, and also apply to bridge management system using GSIS for site and character of bridges. And with that, position and character apply to bridge management system using GSIS.

• Structural Monitoring and Maintenance
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• 제10권3호
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• pp.191-205
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• 2023

In this paper, through operational modal analysis and ambient vibration tests, the dynamic characteristics of a multi-span simply-supported reinforced concrete highway bridge deck was determined and the results were used to assess the quality of construction of the individual spans. Supporting finite element (FE) models were created and analyzed according to the design drawings. After carrying out the dynamic tests and extracting the modal properties of the deck, the quality of construction was relatively assessed by comparing the results obtained from all the tests from the individual spans and the FE results. A comparison of the test results among the different spans showed a maximum difference value of around 9.3 percent between the superstructure's natural frequencies. These minor differences besides the obtained values of modal damping ratios, in which the differences were not more than 5 percent, can be resulted from suitable performance, health, and acceptable construction quality of the bridge.

• 동남아시아연구
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• 제24권1호
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• pp.191-221
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• 2014

South Sumatra's capital, Palembang, has long maintained a river-oriented transportation system. With road transportation's increased importance for exploiting natural resources, however, hundreds of roads have been constructed since the Dutch colonial period. This article examines how the construction of roads and bridges affected people's lives and social networks in Palembang, and what social and political significance it has in the context of a region in the postcolonial Indonesia, with a focus on the huge river called the Musi River, which horizontally crosses the city. After independence, there has been strong aspiration to link these two parts by road, and in 1965 the Musi Bridge (then the Sukarno Bridge) over the river was eventually opened. The construction of the bridge apparently initiated socioeconomic transformations and development in the region, including Ulu (the southern river bank)'s rapid urbanization. However, the features of regional development actually were prerequisites for "national" development. The regional development was impossible without financial support from the central government, and the local or regional aspiration for development was often supported only when it fitted with national envision. The Musi Bridge was a model case that fitted with such national envision. While it was the symbol of regional development, it was also celebrated as an exemplary sign of "national" development, by both Sukarno's government and Suharto's New Order regime. By analyzing the discussions and discourses regarding the Musi project since early 1950s, in addition to its social and economic impact after the construction, this article explores the continuities and changes in the roles and significance of the (construction of the) Musi Bridge with the changing political backstops in both regimes. Together with it, this article also aims to reexamine the interplay between "the national" and "the regional" in the prevalent aspiration for the national and regional "development" throughout the 1950s and 1960s.

• 한국강구조학회 논문집
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• 제9권3호통권32호
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• pp.309-321
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• 1997

차량이 교량을 통과할 때 교량에 발생하는 충격계수는 교량의 설계시 매우 중요한 인자이다. 본 연구에서는 2연속 강판형교의 지간 중앙점에 발생하는 충격계수에 관한 실험 및 해석적 연구를 수행하였다. 교량의 수치해석시 교량과 차량은 3차원으로 모델링하였으며. 교량의 노면조도는 Intelligent Total Station으로 직접 측정하여 사용하였다. 이때 교량의 주형은 보요소, 콘크리트 바닥판은 쉘요소를 사용하고 주형과 콘크리트 바닥판 사이는 Rigid Link를 사용하여 연결시켰다. 교량과 차량 사이의 상호작용을 고려하여 차량의 운동방정식을 유도하였으며, 차량의 여러 가지 주행속도에 따른 교량의 지간 중앙점에서의 충격계수를 구하여 우리나라 및 외국의 시방서 규정과 비교 검토하였다.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2003년도 추계 학술발표회논문집
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• pp.288-294
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• 2003

Increasing the volume of traffic on the roads causes social and economical problems such as increasing air-pollution and distribution cost. Prefabricated light weight bridge becomes a possible solution for these problems in the urban area where it is difficult to construct new one or expend the existing road. There are some merits in this kind of bridge. First, the design live and dead loads are minimized by allowing only passenger cars. Second employing prefabrication construction scheme reduces the construction time. Third, there is no need to buy land if the elevation road is placed on the top of existing one. In seismic design of bridges, base isolation has been an effective solution when the bridge has stiff piers and a heavy superstructure. The prefabricated light weight bridge has different dynamic characteristics from the ordinary bridges. In this paper, the applicability of base isolators such as lead rubber bearing and elastomeric bearing, to prefabricated light weight bridge is examined.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 춘계 학술발표회 논문집
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• pp.667-676
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• 2005

In this research, the reasonable local scour estimates considered conditions of the bed material and the flow was accomplished on two piers P14 and P17 of Il-san bridge. Especially, the Il-san bridge was located on the lower Han-river where is influenced by the tides of In-chon, and it has hydraulic condition that can cause the bridge piers local scour because of tides at ordinary times, as well as a flood. Therefore, the local scour depth has been presented influenced by the maximum velocity of the flow when a flood after construction and the tides on construction on the basis of the standards of river design and road design, furthermore, the results was made a comparative analysis. According to the results, the local scour depth on the basis of the standards of river design was higher than it on the basis of the standards of road design(SRICOS), and the local scour depth influenced by the maximum velocity of the flow when a flood after construction was determined the final local scour depth of P14 and P17 at the Il-san bridge. It was ascertained that the local scour depth did not exceed the inserted depth of bridge foundation.

• 기술사
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• 제34권4호
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• pp.17-29
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• 2001

After participating in the 2nd, Asian Civil Engineering Conference which is subjected by Japan, a trip of site during construction recent was done. The country Is being developed to use effectvely by the methods of aqua-line, truss suspersion bridge. double deck bridge, etc. The Japanese engineers have a pride to do their best for the construction In the given environment. 1 want to notify that our civil engineers must have the responsibility to develop the technical engineering, to make the useful country and to resolve the environmental problem via the oversea experience like as.

• 한국환경과학회지
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• 제14권10호
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• pp.905-910
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• 2005

The purpose of this study is the comparative analysis of Susan citizens' images of Eulsook-do as a coastal tourism destination before and after the construction of a road bridge across the Nakdong estuary in order to analyze local people's changes in leisure patterns. Analysis of the images of a pre-construction Eulsook-do that people aged both 40 and less and 50 and more had on five dimensions showed values higher than zero(0) that suggests neutral image, while their images of a post-construction Eulsook-do showed the shrinking size of pentagon on all five dimensions: ET(Entertainment), CA(Culture & Art), EE(Environment & Ecology), RC(Recreation) and LP(Leports) dimensions. Its pre- and post- construction image analysis conducted 20 years after it came to be built finds that the road bridge construction has led to the ecological, environmental disruption of the coast and the lower Nakdong river, having negative influence on the images of Eulsook-so.