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-Working Stress Design Approach (WSDA) has been used extensively to design Footing, Raft and Pile foundations with a global safety factor. A new design concept, Limit State Design Approaches (LSDA), following the Eurocode 7 has become popular in recent years. A comparison study between a working stress design approach with a factor of safety equal to two and the Ultimate Limit State (ULS) using Eurocode 7 design approaches with Serviceability Limit State verification (SLS) is done to evaluate the most economic design approach. This is done by calculating the number of piles to support a building of a characteristic vertical permanent load of 60 MN and a characteristic vertical variable load of 20 MN on 18 m bored piles with a diameter of 0.5 m founded on a multi-layer system of silty clay and silty sand and spaced at 3 meter centres. A simulation of three pile load tests using Finite Element Method PLAXIS Software were used in this study to determine the characteristic value of pile resistance and demonstrate pile foundation design using static pile load tests following the Eurocode7.

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The static cone penetration test (s-CPT), or better known in Indonesia as the sondir, has been used as a soil investigation procedure since nearly half a century ago in Europe, especially in the Netherlands and Belgium. This s-CPT is one of the standard practices in soil investigation campaigns and can provide many soil engineering parameters, including soil bearing capacity. This study focuses on the soil bearing capacity analysis in the city of Banda Aceh on the data taken from the 35 points of s-CPT. The analysis of the soil bearing capacity at a depth of 1.4 meters and 2.4 meters below the existing ground level (mbgl) was carried out. Dominantly, at a depth of 1.4 mbgl at the research location, it has a low bearing capacity (<2.5 tons/m2) with a percentage of 91.43%. There are 2.86% for bearing capacity from 2.5 to 5 tons/m2, from 5 to 7.5 tons/m2, and from 7.5 to 10 tons/m2. No soil layer had a bearing capacity above 10 tons/m2. At a depth of 2.4 mbgl, the research location has a low bearing capacity (<2.5 tons/m2) with a percentage of 48.57%, for bearing capacity ranging from 2.5 to 5 tons/m2 is 17.14%, for bearing capacity of 5 to 7.5 tons/m2 is 2.86%, for bearing capacity of 7.5 to 10 tons/m2 of 5.71% and bearing capacity above 10 tons/m2 is 25.71%.