Reliability analysis and design criteria for static strength of spherical tanks
LIU Cen
YANG Fan
WU Senlin
LIN Hui
HONG Kai
LIU Xiaoning
Abstract：[Objective]To address the reliability design challenges of steel spherical tanks when static strength and load distribution parameters are interval values,a set of reliability design criteria for spherical tanks based on the combination of probabilistic and non-probabilistic theories was established.[Methods]Firstly,by introducing set theory,a reliability index model was established when the strength distribution parameters were interval values.Then,various conditions,including hydraulic,gas pressure,and gas-liquid combination tests under both extreme and general requirements,as well as normal operation,were systematically analyzed.Finally,the reliable indicators,stress limiting coefficients and safety factors for yield and burst strength were derived based on the median diameter formula.[Results]The range of values for yield and burst strength coefficients that meet reliability requirements under various test and operational conditions are determined,and corresponding condition factors are given.The research results offer a quantitative reliability reference scheme for the static strength design of spherical tanks,enhancing the safety and rationality of the design.
Keywords：Spherical tankStatic strengthReliabilitySafety factorWorking condition coefficientTest stress limiting coefficient
Publication Date：2026-03-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 29-36 )