本研究主要目的是在探討二階可靠度(SORM)逼近法於船體結構可靠度之適用性與精確度評估。對於造船與海洋工程上的大型且複雜結構物而言，其所面臨的海洋環境具有高度的不確定性與複雜性，因此船體所受的外在負荷與結構強度參數是呈非線性狀態，使得可靠度中之統御函數為非線性，當破壞面之曲率較大或曲率半徑較小時，以線性方程式來近似破壞曲面中之最可能破壞點的一階可靠度方法就變的相當不精準。利用二階可靠度逼近法來改善一階可靠度法的精確性，使可靠度分析不再受困於小曲率和隨機變數少時才可求解的限制，提高可靠度的適用範圍。
本文是針對二艘實船利用經驗公式來求取船舶之極限強度，再以經驗二階可靠度方法與多設計點可靠度方法，來進行一階與二階可靠度分析，並且交叉比較以期在進行可靠度分析時能夠獲得更加準確及可信的結果。

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