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LRFD 강관말뚝 설계를 위한 목표 신뢰성지수 결정 연구
임재춘 ( Lim Jae-choon ),김현태 ( Kim Hyeon-tae ),김대현 ( Kim Dae-hyeon ),박주원 ( Park Ju-won ),이증빈 ( Lee Cheung-bin ) 한국구조물진단유지관리공학회 2011 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.15 No.2
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.
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.
간편 간접추론방법 퍼지 제어기를 이용한 2×2 상호 결합공정 제어에 관한 연구
임재춘,채창현,고택범,류창렬 금오공과대학교 산업기술개발연구원 2000 産業技術開發硏究 Vol.16 No.-
This paper describes the design of SIIM (Simplified Indirect Inference Method) fuzzy controller and decoupling filter for 2x2 interacting process. The overall system for Two-Input Two-output(TITO) interacting processes consist of two fuzzy SISO PID controllers and 4 decoupling filter elements. The proposed fuzzy controller preserves the simple linear structure of its conventional counterpart, but has nonconstant gains, which enhances its self-tuning control capability, thereby significantly improves tracking control performance. The fuzzification, control-rule execution and defuzzification routines are so simple that the proposed controller has the ability of high speed inference and to adapt the increase of fuzzy inputs. The proposed fuzzy control system with three types decoupling filters are tested in tow types of 2x2 interaction processes. All computer simulation results have demonstrated superior to the control performance of the one proposed by K.A Toh et al.
터널과 도로 및 교량에 대한 VE/LCC 분석에 관한 연구
안종필,박경호,임재춘 朝鮮大學校 建設技術硏究所 2006 建設技術硏究 Vol.26 No.1
It is actual state in our country that the number of tunnels on the road increases consistently but there is no study or computer program on life cycle cost Ihereinafter "LCC") of tunnel. This research is for the purpose of calculating the LCC for tunnel on the road and applying it to the systematic maintenance & management and analysis of economical efficiency. Further the developed computer program calculating the LCC for tunnel on the road increases the efficiency in tunnel design and in decision of investment considering the maintenance & management and the economical efficiency and it will be a useful tool with relation to VE/LCC technique. VE analysis is constituted of performance represented by P. life cycle cost represented by C and value represented by V. P is calculated under considering weight and degree of estimation which explain the importance of each facilities to the estimation item. C is determined from getting sum of the present prices of initial construction cost, maintenance & management cost during service life, break-up & disposal cost. V is obtained from dividing the P by C, that is V=P/C. The estimation list of the maintenance & management on tunnel has been set up as items whose maintenance & management cost was appeared to be relatively larger than the others and there were decision of the variables of effect such as frequency of maintenance & repair, unit cost, repairing rate, etc.. And also, all the cost were converted into present prices considering the economic variables for example discount rate, etc. Excel base LCC analysis system of tunnel on road was developed and tested on a sample tunnel.