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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
LHI Journal of Land, Housing, and Urban Affairs
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Journal DOI :
Land and Housing Institute
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Volume & Issues
Volume 6, Issue 4 - Oct 2015
Volume 6, Issue 3 - Jul 2015
Volume 6, Issue 2 - Apr 2015
Volume 6, Issue 1 - Jan 2015
Selecting the target year
A Study on the Demand Zone of Housing for New Town: Focused on Seoul Metropolitan Area
Kim, Jong-Lim ; Cho, Han-Jin ; So, Soon-Woo ;
LHI Journal of Land, Housing, and Urban Affairs , volume 6, issue 3, 2015, Pages 107~115
DOI : 10.5804/LHIJ.2015.6.3.107
Recently one of interest concern in domestic housing market is to reduce the difference of supply and demand. Exact demand estimation by accurate demand region is a essential cue to reduce the gap. This empirical study compared the data of housing subscriber's real address with estimated demand area on household movement, which are applied by advanced studies. This empirical case data is related to 3 housing development districts in metropolitan area. As a result, This study found that the real demand area has a more widened coverage compared with those of household movement one. For to establish exact demand area, we found, more complementary considerations should be taken. Especially some factors such as distance between a project site and downtown of Seoul Metropolitan City, locational competitiveness on main demand and behind demand, and development scale are more considerable variables. In additionally, we found the demand areas are influenced by housing rental types, sizes and the real estate business trends. And also, this study found those factors should be considered with housing price and locational competitiveness.
The Feasibility Analysis of Urban Public Rental Housing in Korea
Kim, Ok-Yeon ; Kim, Yong-Tai ; Kim, Yong-Soon ;
LHI Journal of Land, Housing, and Urban Affairs , volume 6, issue 3, 2015, Pages 117~127
DOI : 10.5804/LHIJ.2015.6.3.117
Korean government has launched a new public rental housing policy for younger generation suffering from instable housing conditions in CBD area. This paper is to analyze the financial feasibility of urban public rental housing projects, based on its cash flows. Urban rental housing projects should find out the way to reduce costs and to secure cheap land, because of the high land price in CBD area and complex relationship of legal rights. Project types are categorized by the land acquisition method and district characteristics. For 10 sample projects, financial feasibility was analyzed. Cash flows were calculated on the design plan and 16 scenarios were made by combining 4 important variables. The variables are increase rate of land price, increase rate of monthly rents, ratio of public and market rents, and the interest rate of National Housing Fund. The findings are as follows. Government land rent-type can reduce initial costs because it is not necessary to buy land. However, total NPV is lowered at the time of liquidation due to the land return. Private land acquisition-type require more initial costs. But the NPV at liquidation time increases with land disposal. To improve financial feasibility, acquisition-type should be preferred in high land-price area and rent-type should be preferred in low land-price area. Among influencing variables, the rate of increase in land price and the ratio of public and market rents turned out to be the most important. Although the ratio of public and market rents can be controllable, high ratio will cause the burden of tenants. Therefore, interest rate adjustment of National Housing Fund is more desirable.
Development of Hybrid OCB Beam for the Long-span Building Structures
Lee, Doo-Sung ; Kim, Sang-Yeon ; Kim, Tae-Kyun ;
LHI Journal of Land, Housing, and Urban Affairs , volume 6, issue 3, 2015, Pages 129~138
DOI : 10.5804/LHIJ.2015.6.3.129
The building structure in Korea is planned to maximize the use of space in recent. The hybrid OCB(Optimized Composite Beam) beam is developed to take advantage of using the space. The OCB beam is composed of the steel H-beam section reinforced by open strands in negative moment zone and the pretensioned PSC concrete section in positive zone. Flexural behavior of typical architectural hybrid OCB beam section was investigated by F.E.M. The 15m, 20m, 30m OCB models were tested on nonlinear material and geometry under static loading system. Following results are obtained from the analysis; 1)The OCB beam develop initial flexural cracking over full service loading. 2)Overall deflections of OCB beam under the service loads are less than those of the allowable limits in KCI Code(2012). 3)The ultimate load capacity get over the nominal strength of the OCB main section. The OCB beam is verified of structural reliability from the finite element analysis.
Analytical Study on the Appropriateness of Design Formula and Possibility of Improving Bearing Capacity of Bored Pile
Park, Jong-Bae ; Lee, Bum-Sik ; Park, Yong-Boo ;
LHI Journal of Land, Housing, and Urban Affairs , volume 6, issue 3, 2015, Pages 139~145
DOI : 10.5804/LHIJ.2015.6.3.139
To improve the pile design efficiency(design bearing capacity/the strength of materials) from 70 percent(160tonf) to 80 percent(190tonf), this paper analysed the existing pile loading test data and performed the precise dynamic loading test and Bi-directional loading test for the first time in Korea. Analysis result of the existing dynamic loading test data by Davisson method showed that bearing capacity of piles penetrated at weathered rock stratum(N=50/15) exceeded 190tonf. But the analysis result by CAPWAP method showed that piles less than the target bearing capacity were 40% due to the lack of impact energy. To get the target bearing capacity from the dynamic loading test, using the hammer over 6tonf to trigger the enough impact energy is necessary. Allowable bearing capacty of Bi-directional static loading test by Davisson method was 260.0~335tonf(ave. 285.3tonf) and exceeded overwhelmingly the target capacity. And this exceeded the bearing capacity of precise dynamic loading test(ave. 202.3tonf) performed on the same piles over 40%. The difference between the capacity of Bi-directional loading test and dynamic loading test was caused by the insufficient impact energy during dynamic loading test and increase by interlocking effect by near piles during Bi-directional static loading test.
Comparative Study on the Quantity Economic Analysis of Apartment Frames Using SDS Result of Dynamic Centrifuge Test at Pile Foundation
Kim, Sang-Yeon ; Park, Jong-Bae ; Park, Yong-Boo ;
LHI Journal of Land, Housing, and Urban Affairs , volume 6, issue 3, 2015, Pages 147~152
DOI : 10.5804/LHIJ.2015.6.3.147
Site coefficient and amplification factor of current domestic Seismic Design Code based on American Seismic Code, have no consideration for the domestic ground condition in which the base rock is normally placed within 30m form the surface. By previous studies, the measured spectral acceleration of the result of dynamic centrifugal test and analysis was smaller than the design spectral acceleration for the period over 1.5 sec. Accordingly, in this study structural analysis and design using dynamic centrifugal test result for pile foundation were achieved, and the quantity of concrete and reinforcement of wall frame was compared with each other. Comparison results of cost using KBC the design spectral acceleration of SC, SD site and SDS, the quantity of reinforcement using SDS for SD site was 17~23% smaller than using the design code SD site.