강관말뚝의 목표신뢰성지수 및 저항계수 산정

Abstract

The necessity of developing the load and resistance factor design(LRFD) for foundations has recently been increased, since the limit state design is requested as international technical standard for the foundation of structures. In this thesis, to implement LRFD for foundation structures in Korea, the 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 tests and soil property tests conducted in Korea were collected along with available subsurface investigation results. The static bearing capacity formula and the Meyerhof method using N values were used to calculate the expected design bearing capacities of the piles. The resistance bias factors were evaluated for the two static design methods by comparing the representative measured bearing capacities with the expected design values. Reliability analyses were performed by two types of advanced methods: the First Order Reliability Method(FORM) and the Monte Carlo Simulation(MCS) method using resistance bias factor. Based on the analyses, the target reliability indices and resistant factors were suggested for driven steel pipe piles under the LRFD framework, leading to accelerating the implementation of LRFD in place of allowable stress design.