结构安全性设计的广义方法

发布时间：2018-05-23 10:11

本文选题：结构可靠度 + 分项系数法　；参考：《建筑结构学报》2017年10期

【摘要】：基于概率的分项系数法是结构可靠度通用设计方法,也是我国现行结构设计规范的重要基础,但在30多年的实际应用中,该方法已逐渐显现出广义性和可靠度控制精度不足等缺陷。借鉴国际标准ISO 2394:2015中设计值法的基本思路,根据前期提出的结构安全性设计的广义表达式和标准灵敏度系数的取值方法,提出结构安全性设计的广义方法,并对其进行了必要的简化。该方法可在设计中直接考虑基本变量概率特性、目标可靠指标和设计使用年限变化对设计结果的影响,基于作用和结构性能的新近统计结果,建立新材料、新型结构的可靠度设计方法,并允许业主选取不同的目标可靠指标和设计使用年限,具有良好的普适性,较国际标准中的设计值法也更具有实用性。理论和实例分析结果表明:广义设计方法采用了利用解析优化提出的标准灵敏度系数建议值,可更好地实现对可靠度的控制;该法较目前的分项系数法和设计值法具有更高的可靠度控制精度。
[Abstract]:The method of sub-coefficient based on probability is the general design method of structural reliability, and it is also the important foundation of the current structural design code in China. However, it has been applied in practice for more than 30 years. The method has gradually shown some defects such as broad sense and low precision of reliability control. Referring to the basic idea of the design value method in the international standard ISO 2394: 2015, and according to the generalized expression of the structural safety design and the value method of the standard sensitivity coefficient, the generalized method of the structural safety design is put forward. And it is necessary to simplify it. This method can directly consider the probability characteristics of basic variables, the influence of the reliability index of target and the change of design life on the design results. Based on the recent statistical results of function and structural performance, the new materials are established. The reliability design method of the new structure, and allows the owner to select different target reliability index and design service life, has good universality and is more practical than the design value method in the international standard. The results of theoretical and practical analysis show that the generalized design method adopts the suggested value of standard sensitivity coefficient proposed by analytic optimization, which can better control the reliability. The reliability control accuracy of this method is higher than that of the current method of subdivision coefficient and design value.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金项目(50678143,51278401)
【分类号】：TU318

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