Stability analysis for vertical breakwater foundation according to ASD and LRFD

Tóm tắt

This paper analyzes the stability of breakwater foundations using two methods: the traditional allowable safety factor design (ASD) and the load factor and resistance factor method (LRFD), both based on reliability theory. Six vertical breakwater cross-sections were analyzed using the Bishop method to calculate the factor of safety (FS), with the basic load combination. Subsequently, the Monte Carlo simulation method was employed in reliability analysis to determine the load factors and resistance factors. All calculation steps are performed on the MATLAB platform. The analysis results show that the safety level of the stability of breakwater foundations using LRFD depends largely on the variation of the soil strength. When designing using LRFD with a target reliability index of 3.0, the design using ASD is safer than the LRFD design if the variation in soil strength is small. However, when the coefficient of variation of soil strength is great, the ASD approach is often less safe than the LRFD.