 This paper proposes a new structural reliability method for multi-dimensional systems. This method is based on the assumption that the system can be modeled as a single degree of freedom, DOF, system, where each DOF is assumed to have its own reliability function. The proposed method is then applied to two real world cases, one involving a wind turbine and another involving a tower. The results show that the proposed method is able to accurately predict the failure probability of the system. This article was authored by Oleg Gaidi, Yehanshin, Jin Xiangshu, and others.