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임재춘 ( Jae Choun Lim ),나상훈 ( Sang Hun Na ),안종필 ( Jong Pil Ahn ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.1
The spot where bottom foundation of a marine bridge is constructed is deep in depth of water and a bedrock, bearing stratum, is very deeply distributed. So, I analyzed material of soil profile and then evaluate bearing capacity and safety of settlement when a stake of site construction is designed using a projection cast in place concrete pile and a sacrifice steel cast in place pile. Also, I analyzed and researched practical affairs like a slime processing and plumbing maintenance in supervision of execution.
LRFD 강관말뚝 설계를 위한 목표 신뢰성지수 결정 연구
임재춘,김현태,김대현,박주원,이증빈 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.2011 No.9
As a part of study to develop LRFD(Load and Resistance Factor Design) codes for foundation structures in GwangYang region, reliability analyses for driven steel pipe piles are performed and target reliability indices are selected carefully. The 16 data sets of static load tests and soil property tests conducted in the whole domestic area were collected and analyzed to determine the representative bearing capacities of the piles. The static bearing capacity formula and the Meyerhof method using N values are applied to calculate the expected design bearing capacity of the piles. The resistance bias factors were evaluated for the two static design methods by comparing the representative bearing capacities with the design values. Reliability analyed methods : First Order Reliability Method(FOSM), and Monte Carlo Simulation(MCS) method using resistance bias factor statistics.
광양지역에 적합한 항타강관말뚝의 목표신뢰성지수 및 저항계수 산정
김현태(Kim, Hyeon-Tae),김대현(Kim, Daehyeon),임재춘(Lim, Jae-Choon),박경호(Park, Kyung-Ho),이익효(Lee, Ik-Hyo) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.12
최근 구조물 기초 분야에 대한 한계상태설계법이 국제적인 기술표준으로 요구됨에 따라 연구기반이 미약한 연약지반 개량공법에 대한 하중저항계수설계법 개발의 필요성이 대두되었다. 본 연구는 신뢰성 분석을 통해 항타강관말뚝의 목표신뢰 성지수 및 저항계수를 산정하여 기초 구조물에 대한 LRFD code를 개발하고자 하였다. 프로그램의 검증을 위해 광양지역 16개의 항타말뚝 재하시험 결과와 2008년 한국건설기술연구원에서 이용된 57개의 항타말뚝 재하시험 결과를 취합하였다. 구조물기초설계기준에서 제안하고 있는 두가지 정역학적 설계공식에 대해서 대표 측정지지력과 설계지지력을 비교함으로써 저항편향계수를 평가하였고, 저항편향계수의 통계특성을 이용하여 일차신뢰도법 및 몬테카를로 실뮬레이션에 의한 신뢰성 분석을 실시하였다. 그 결과, 항타강관말뚝의 목표 신뢰성지수 2.0, 2.33, 2.5에 대해서 선단부 N치 50이하인 경우 두 지지력 공식의 저항계수는 각각 0.611∼0.684, 0.821∼0.537, 선단부 N치 50이상인 경우 각각 0.608∼0.545, 0.749∼0.643으로 제안되 었다. 본 연구결과는 향후 다양한 기초구조물 및 지반구조물의 하중저항계수설계법 개발을 위한 자료로서 그 활용성이 있을 것이다. Recently, the necessity of developing the load and resistance factor design(LRFD) for soft ground improvement method has been raised, since the limit state design is requested as international technical standard for the foundation of structures. In this study, to develop LRFD codes for foundation structures in Korea, target reliability index and resistance factor for static bearing capacity of driven steel pipe piles were calibrated in the framework of reliability theory. The 16 data(in Gwangyang) and the 57 data(Korea Institute of Construction Technology, 2008) sets of static load test and soil property tests conducted in the whole domestic area were collected along with available subsurface investigation results. The resistance bias factors were evaluated for the tow static design methods by comparing the representative measured bearing capacities with the expected design values. Reliability analysis was performed by two types of advanced methods : the First Order Reliability Method (FORM), and the Monte Carlo Simulation (MCS) method using resistance bias factor statistics. As a result, when target reliability indices of the driven pipe pile were selected as 2.0, 2.33, 2.5, resistance factor of two design methods for SPT N at pile tip less than 50 were evaluated as 0.611∼0.684, 0.537∼0.821 respectively, and STP N at pile tip more than 50 were evaluated as 0.545∼0.608, 0.643∼0.749 respectively. The result from this research will be useful for developing various foundations and soil structures under LRFD.
안종필 ( Jong Pil Ahn ),나상훈 ( Sang Hun Na ),임재춘 ( Jae Choun Lim ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.2
In this study, it has been indicated reasonable investment decision makings for an Sewer Pip Structures design and the process to analyze VE/LCC(Value Engineering/Life Cycle cost) analysis for selecting patterns. Through the process indicated, it makes the squandering of resources and environmental disruption minimize in public. In the ultimate, this study is accomplished to indicate objective analysis patterns for the value which is a main valuation pattern for the most reasonable investment decision makings. The VE/LCC process is applied to Sewer Pipe selecting patterns in real as well. To sum up the result of this study, it shows to indicate separately; technical element (hydraulic stability, durability, structure stability) and social element (greenness, maintenance and management, construction, function convenience) on the standard item of an Sewer Pipe Structures efficiency evaluation. consideration item could be apply and estimate more systematically through accomplishments; the result of the questionnaire to experts apply to AHP in the items which are function evaluations and estimating weight for Sewer Pipe Structures selecting patterns. The most suitable result has been selected according to the initial cost of construction from only experience decision of experts for selecting a most suitable alternative in established Sewer Pipe Structures but, in this study, alternatives could be selected from LCC analysis including the initial cost of construction as well as maintenance and management expenses. The proposed methodology incorporates a VE/LCC model and a performance evaluation technique to properly handle the uncertainties associated with the historical data and to analyze the value of alternatives more rationally.