Reliability analysis method for hybrid uncertainty structure

An uncertainty and analysis method technology, applied in the field of reliability analysis for mixed uncertainty structures, can solve problems such as obstacles, poor accuracy, and narrow application range, and achieve the effect of expanding the application range.

Active Publication Date: 2020-07-10
ANHUI WATER RESOURCES DEV
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Problems solved by technology

[0004]In practical activities, the actual structure is often a mixed uncertainty structure, and two types of uncertainties exist at the same time. The more mature stochastic uncertainty structural reliability th

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  • Reliability analysis method for hybrid uncertainty structure
  • Reliability analysis method for hybrid uncertainty structure
  • Reliability analysis method for hybrid uncertainty structure

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[0034] In order to make the object, technical solution and advantages of the present invention more clear, the content of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Such as figure 1 As shown, the reliability analysis method for the mixed uncertainty structure in this embodiment mainly includes the following steps:

[0036] Step 1: Statistically structure the information and data of uncertain parameters, use random variables to represent random uncertain parameters, and use interval variables to represent cognitive uncertain parameters; for the random uncertain parameters, use statistical information and data based on The method of probability distribution goodness-of-fit test obtains the probability density function of random variable; For cognitive uncertainty parameter, adopts non-statistical measure method to analyze statistical information and data, obtain interval variabl...

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Abstract

The invention discloses a reliability analysis method for a hybrid uncertainty structure. The method comprises the steps: firstly, respectively adopting a random variable and an interval variable to represent a random uncertainty parameter and a cognitive uncertainty parameter; generating a probability representative point and an attached probability according to a probability density function ofthe random variable; for each probability representative point, calculating upper and lower bound values of a structure performance function in an interval variable distribution interval; finally, according to the PDEM, numerically solving a generalized probability density evolution equation, and acquiring a structural reliability distribution interval. According to the method, the defects of poorprecision, low calculation efficiency and narrow application range of a traditional reliability analysis method under the hybrid uncertainty are overcome, the method better conforms to engineering practice, and a foundation is laid for reliability-based hybrid uncertainty structural design and optimization.

Description

technical field [0001] The invention relates to the field of structural reliability analysis methods, in particular to a reliability analysis method for mixed uncertainty structures. Background technique [0002] The high-level and high-efficiency design and construction of engineering structures play a decisive role in the rapid development of the national economy. Engineering structures are full of various uncertainties related to structural resistance and external loads in the process of design and construction, and the existence of uncertainties has an important impact on the quality and safety of engineering structures. If the uncertainty is ignored in actual engineering, it will affect the structural performance and even bring catastrophic accidents. Therefore, the reliability analysis theory with uncertainty structure is one of the key research contents in engineering practice. Uncertainty is often divided into two categories in the existing research: random uncerta...

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Application Information

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IPC IPC(8): G06F30/13G06F30/23G06F119/02
Inventor 赵时运王磊陈刚陶双龙
Owner ANHUI WATER RESOURCES DEV
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