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Method for establishing probability models of fatigue failure and fatigue life of 9cement-based materials in consideration of stress level

A technology of cement-based materials and stress levels, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems that there are no relevant research reports on the fatigue life probability of cement-based materials

Active Publication Date: 2017-01-04
ZHEJIANG UNIV
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Problems solved by technology

However, there is no relevant research report on how to establish the probability model of fatigue life of cement-based materials.

Method used

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  • Method for establishing probability models of fatigue failure and fatigue life of 9cement-based materials in consideration of stress level
  • Method for establishing probability models of fatigue failure and fatigue life of 9cement-based materials in consideration of stress level
  • Method for establishing probability models of fatigue failure and fatigue life of 9cement-based materials in consideration of stress level

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Embodiment Construction

[0026] The specific implementation of the technical solution provided by the present invention will be further described below in conjunction with the accompanying drawings. This implementation example is an illustration of the present invention, rather than limiting the present invention.

[0027] The uniaxial compression fatigue test of three stress levels was carried out on the sample of the ultra-high toughness cement-based material, and the average value of the compressive strength of the material under quasi-static loading was 42.3 MPa. Fatigue test The stress ratio R is 0.1, the loading frequency is 4Hz, and the stress levels are 0.90, 0.80, 0.70 respectively, and the fatigue life of the samples under each stress level is obtained, as shown in the table below. A quasi-static uniaxial compression test was performed on the cement-based material, and the quasi-static loading strengths obtained were 41.2MPa, 42.7MPa, 41.0MPa, 42.4MPa, 44.1MPa and 42.4MPa, respectively.

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Abstract

The invention discloses a method for establishing probability models of fatigue failure probability and fatigue life probability of a cement-based material in consideration of a stress level. Based on the quasi-static loading strength and the fatigue life at different stress levels of cement-based materials, the fatigue life probability model of the cement-based materials can be obtained easily and quickly. On the one hand, the model can predict the fatigue failure probability of the cement-based materials and structures using the cement-based materials by the number of fatigue load cycles. On the other hand, the fatigue life of the cement-based materials and structures can be calculated by setting the fatigue failure probabilities, which provides a new way and a new method for the fatigue performance design and service condition detection and evaluation of the structure under fatigue load.

Description

technical field [0001] The invention patent belongs to the technical field of cement-based material fatigue probability model. Background technique [0002] Cement-based materials are engineering materials that use cement as the cementitious material. Since the advent of Portland cement in the 19th century, concrete and other cement substrates have been widely used in transportation, construction, water conservancy, marine and other engineering fields, and are the most used materials in engineering construction. At the beginning of the 20th century, with the construction and development of reinforced concrete bridges, related research on the fatigue performance of cement-based materials was gradually carried out. Since the 21st century, with the construction of large-scale infrastructure such as highways, high-speed railways, super high-rise buildings, super-high dams, sea-crossing bridges, and ocean platforms, the fatigue performance of cement-based materials and their str...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 李庆华徐世烺黄博滔
Owner ZHEJIANG UNIV
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