사질토 지반 얕은기초의 목표신뢰도지수 및 저항계수 산정

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Load and Resistance Factor Design(LRFD) is one of the limit state design methods and has been used worldwide in civil engineering designs, especially in North America, Asia, and other developing countries. Accordingly, the studies on LRFD has been actively conducted in Korea. However, the data for LRFD in Korea were not sufficient to perform statistical and reliability analyses, so resistance factors suggested by American Association of State Highway and Transportation Officials(AASHTO) have been uesd for the civil structural designs in Korea.
The calibration of resistance factor based on the reliability theory for the development of limit state design of shallow foundation requires a reliable estimate of ultimate bearing capacity. The plate bearing test result is commonly used in geotechnical engineering practice to predict the ultimate bearing capacity of shallow foundation.
Many graphical methods are specified in the design standards to define the ultimate bearing capacity based on the load-settlement curve. However, the ultimate bearing capacity determined based on the load-settlement curve has a low level of reliability to obtain an uniform ultimate load depend on engineering judgement.
In this study, a well fitting nonlinear regression model is proposed to estimate the ultimate bearing capacity of shallow foundation and the results are compared with those calculated using previous graphical method. Applicability of LRFD for shallow foundations on weathered soils in Gwang-ju and Jeollanam-do provinces was investigated and resistance factor for these cases was proposed. The quantitative analyses on the uncertainty and resistance bias for shallow foundation on weathered soils were performed by collecting the statistical data about domestic case studies for design and construction of shallow foundation. Reliability analyses of shallow foundations were performed using LEVELs Ⅱ (First order Design value Approach) and Ⅲ (Monte Carlo Simulation) methods.
Alternative Title
Calculation of Target Reliability Index and Resistance Factor of Shallow Foundation in Sand
Alternative Author(s)
Kim, Sung Heon
조선대학교 대학원
일반대학원 토목공학과
Awarded Date
Table Of Contents
목 차


제1장 서 론 01
1.1 연구배경 및 목적 01
1.2 연구동향 02
1.3 연구방법 및 내용 04

제2장 얕은기초 설계 및 LRFD 설계기준 06
2.1 얕은기초 이론적 고찰 06
2.1.1 얕은기초 정의 06
2.1.2 얕은기초의 지지력 이론 10
2.2 허용응력설계법과 하중저항계수설계법의 설계기준 20
2.3 하중저항계수설계법 적용방안 및 개발절차 39
2.3.1 데이터베이스 구축 및 극한지지력 판정 39
2.3.2 목표신뢰도지수의 결정 및 한계상태설계법 개발절차 42
2.3.3 평판재하시험 시험방법 및 극한지지력 평가 44

제3장 저항편향계수의 통계특성 57
3.1 저항편향계수의 분석 57
3.2 저항편향계수의 산정 62

제4장 얕은기초의 신뢰도 해석 및 설계기준 65
4.1 해석대상 65
4.2 신뢰도 해석 적용 프로그램 72
4.3 일계 신뢰도 해석기법에 의한 신뢰도 평가 73
4.4 몬테카를로 시뮬레이션에 의한 신뢰도 평가 79
4.5 목표신뢰도지수 산정 81
4.6 하중 통계특성 86
4.7 안전율을 이용한 저항계수 예비산정 89
4.8 신뢰도 해석에 의한 저항계수 보정 90
4.8.1 저항의 통계학적 특성 90
4.8.2 지지력 이론식에 대한 저항계수 보정 91
4.8.3 저항편향계수와 변동계수에 따른 저항계수 91
4.8.4 목표신뢰도지수에 따른 저항계수 92

제5장 결 론 93

참 고 문 헌 95
조선대학교 대학원
김성헌. (2016). 사질토 지반 얕은기초의 목표신뢰도지수 및 저항계수 산정.
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General Graduate School > 4. Theses(Ph.D)
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