可靠性安全系数法在结构静强度设计中的应用

Application of Reliability Safety Coefficient Method on Design of Structure Static Strength

针对传统静强度设计中常出现的结构失效、可靠性低等现象,研究应力-强度干涉模型的原理、安全系数与可靠性系数的关系,利用可靠度安全系数法来进行结构静强度设计,提高结构静强度可靠性。简要介绍了结构静强度设计的基本流程,说明了构件强度和应力分布类型以及参数的确定方法;详细介绍了应力和强度都符合正态分布的可靠度系数和概率安全系数的计算方法,并给出了可靠度安全系数的计算公式,提出了可靠性安全系数法实施步骤。以某设备为例,详细说明了如何利用可靠性安全系数法设计螺钉直径,并进行校核。试验证明该方法有效、可行。

To solve the structure failure and the low reliability of structure, the principle of stress-strength interference model and the relation of safety coefficient and reliability were researched.The reliability of structure static strength was improved using reliability safety coefficient method. The basic flow chart of structure static strength is briefly introduced. This paper explicates the methods of defining parameters of stress and strength.The calculating methods of reliability coefficient and safety coefficient and the expressions are introduced.The implementation procedure of reliability safety coefficient method is put forward. Taking a type of equipment as an example, it expounds the method of designing bolt diameter by reliability safety coefficient method and checks the result.The test has proved the method is effective and feasible.