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随着模糊数学的广泛应用,研究人员认识到结构的失效标准具有谱的性质,在谱的高值发生高度破坏,在谱的低值发生轻度破坏。因而结构的安全状态不能再用简单的安全与失效两种状态来描述,而是用一系列的中间状态来描述更符合结构的实际情况。结构的可靠度不仅与确定影响因素和不确定影响因素有关,而且与破坏准则的模糊不确定性有关。引入模糊数学理论,建立了预应力混凝土箱梁桥模糊失效准则的隶属函数;基于模糊失效准则,建立了开裂预应力混凝土桥的可靠度计算模型;并以HS大桥为例进行了实例分析。
With the widespread use of fuzzy mathematics, researchers recognize that structural failure criteria have spectral properties that are highly destructive at high values of the spectrum and slightly destructive at low values of the spectrum. Therefore, the structure of the security status can no longer use simple security and failure of two states to describe, but with a series of intermediate states to describe more in line with the actual situation of the structure. The reliability of the structure is not only related to the determination of the influencing factors and the uncertain factors, but also to the fuzzy uncertainty of the failure criterion. The membership function of fuzzy failure criterion of prestressed concrete box girder bridge is established based on fuzzy mathematics theory. Based on the fuzzy failure criteria, the reliability calculation model of prestressed concrete bridge is established. The case of HS Bridge is taken as an example.