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基于子集模拟提出了一种高效的浅基础扩展可靠度设计方法,极大地提高了扩展可靠度设计方法在小概率区域的设计效率,并系统推导了相关的计算公式.为了便于子集模拟在扩展可靠度设计中的应用,构建了一个代理响应量,用来定义子集模拟中的关键参数——驱动变量.同时,为了促进该方法的应用,解决工程师对可靠度分析算法不熟悉的实际困难,本方法以EXCEL的表单环境为计算平台,联合运用Visual Basic Application编写设计程序和用户界面.最后,以一个浅基础设计算例,说明了所提方法及所开发的计算程序的准确性和有效性,并系统地探讨了子集模拟中驱动变量对浅基础可靠度设计的影响,证明了在扩展可靠度设计中采用所构建的代理系统响应量定义的驱动变量相对于传统驱动变量的优势.
Based on the subsets simulation, an efficient design method of shallow base extension reliability is proposed, which greatly improves the design efficiency of the extended reliability design method in the small probability area and derives the relevant calculation formulas systematically.In order to facilitate the simulation of subsets In order to extend the application of reliability design, a proxy response is constructed, which is used to define the key parameter-driving variable in subset simulation. In the meantime, in order to promote the application of this method, it solves the problem that engineers are unfamiliar with reliability analysis algorithm Difficulty, this method takes EXCEL’s form environment as a computing platform and uses Visual Basic Application to write design program and user interface.Finally, with a shallow basic design example, it shows the accuracy of the proposed method and the developed calculation program and Validity of the proposed method, and systematically discusses the influence of the driving variables on the design of shallow foundations reliability in sub-set simulation, and proves that the advantages of the driving variables defined by the response of the constructed system to the traditional driving variables are demonstrated in the extended reliability design .