钢桁梁体系的疲劳耐久性评估方法

FATIGUE DURABILITY ASSESSMENT METHOD FOR STEEL GIRDER SYSTEM

结构的整体性、损伤的随机性和破坏的过程性是大型钢结构体系疲劳破坏的主要特征,现行的疲劳评估方法难以全面地考虑这些问题.本文在系统模块分解方法和结构系统可靠度理论的基础上,提出复杂钢桁梁体系疲劳耐久性评估的结构系统可靠度模块分析(SRBA)方法,并介绍了所开发的程序(FRAPSS)和评估算例.这种方法在工程应用中具有通用性和简单性.

<ABSTRACT> Structural integrity, probabilistic damage and progressive failure are three main features of fatigue of large scale steel structures, which should be considered with a systematic approach. Nowadays most fatigue assessment of structures is limited to the level of elements, or apply unpractical systematic methods. A new algorithm called Systems Reliability Blocking Analysis (SRBA) is proposed in this paper to estimate the fatigue durability of steel girder structures, based on the systematic blocking technique and structural reliability theory. Meanwhile, a computer program FRAPSS using this algorithm is developed- The SRBA method of fatigue assessment is more common and convenient in engineering practice.