์ต๊ทผ ๊ตฌ์กฐ๋ฌผ ๊ธฐ์ด ๋ถ์ผ์ ๋ํ ํ๊ณ์ํ์ค๊ณ๋ฒ์ด ๊ตญ์ ์ ์ธ ๊ธฐ์ ํ์ค์ผ๋ก ์๊ตฌ๋จ์ ๋ฐ๋ผ ์ฐ๊ตฌ๊ธฐ๋ฐ์ด ๋ฏธ์ฝํ ์ฐ์ฝ์ง๋ฐ ๊ฐ๋๊ณต๋ฒ์ ๋ํ ํ์ค์ ํญ๊ณ์์ค๊ณ๋ฒ ๊ฐ๋ฐ์ ํ์์ฑ์ด ๋๋๋์๋ค. ๋ณธ ์ฐ๊ตฌ๋ ์ ๋ขฐ์ฑ ๋ถ์์ ํตํด ํญํ๊ฐ๊ด๋ง๋์ ๋ชฉํ์ ๋ขฐ์ฑ์ง์ ๋ฐ ์ ํญ๊ณ์๋ฅผ ์ฐ์ ํ์ฌ ๊ธฐ์ด ๊ตฌ์กฐ๋ฌผ์ ๋ํ LRFD code๋ฅผ ๊ฐ๋ฐํ๊ณ ์ ํ์๋ค. ํ๋ก๊ทธ๋จ์ ๊ฒ์ฆ์ ์ํด ๊ด์์ง์ญ 16๊ฐ์ ํญํ๋ง๋ ์ฌํ์ํ ๊ฒฐ๊ณผ์ 2008๋
ํ๊ตญ๊ฑด์ค๊ธฐ์ ์ฐ๊ตฌ์์์ ์ด์ฉ๋ 57๊ฐ์ ํญํ๋ง๋ ์ฌํ์ํ ๊ฒฐ๊ณผ๋ฅผ ์ทจํฉํ์๋ค. ๊ตฌ์กฐ๋ฌผ๊ธฐ์ด์ค๊ณ๊ธฐ์ค์์ ์ ์ํ๊ณ ์๋ ๋๊ฐ์ง ์ ์ญํ์ ์ค๊ณ๊ณต์์ ๋ํด์ ๋ํ ์ธก์ ์ง์ง๋ ฅ๊ณผ ์ค๊ณ์ง์ง๋ ฅ์ ๋น๊ตํจ์ผ๋ก์จ ์ ํญํธํฅ๊ณ์๋ฅผ ํ๊ฐํ์๊ณ , ์ ํญํธํฅ๊ณ์์ ํต๊ณํน์ฑ์ ์ด์ฉํ์ฌ ์ผ์ฐจ์ ๋ขฐ๋๋ฒ ๋ฐ ๋ชฌํ
์นด๋ฅผ๋ก ์ค๋ฎฌ๋ ์ด์
์ ์ํ ์ ๋ขฐ์ฑ ๋ถ์์ ์ค์ํ์๋ค. ๊ทธ ๊ฒฐ๊ณผ, ํญํ๊ฐ๊ด๋ง๋์ ๋ชฉํ ์ ๋ขฐ์ฑ์ง์ 2.0, 2.33, 2.5์ ๋ํด์ ์ ๋จ๋ถ N์น 50์ดํ์ธ ๊ฒฝ์ฐ ๋ ์ง์ง๋ ฅ ๊ณต์์ ์ ํญ๊ณ์๋ ๊ฐ๊ฐ 0.611~0.684, 0.821~0.537, ์ ๋จ๋ถ N์น 50์ด์์ธ ๊ฒฝ์ฐ ๊ฐ๊ฐ 0.608~0.545, 0.749~0.643์ผ๋ก ์ ์๋์๋ค. ๋ณธ ์ฐ๊ตฌ๊ฒฐ๊ณผ๋ ํฅํ ๋ค์ํ ๊ธฐ์ด๊ตฌ์กฐ๋ฌผ ๋ฐ ์ง๋ฐ๊ตฌ์กฐ๋ฌผ์ ํ์ค์ ํญ๊ณ์์ค๊ณ๋ฒ ๊ฐ๋ฐ์ ์ํ ์๋ฃ๋ก์ ๊ทธ ํ์ฉ์ฑ์ด ์์ ๊ฒ์ด๋ค. 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.