Establishment Method of Fatigue Life Probability Model of Cement-Based Materials Considering Loading Frequency
A cement-based material, fatigue life technology, applied in the analysis of materials, the use of repetitive force/pulse force testing material strength, instruments and other directions, can solve the problem of cement-based materials fatigue life probability and no relevant research reports.
Active Publication Date: 2019-03-01
ZHEJIANG UNIV
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However, there is no relevant research report on how to establish the probability model of fatigue life of cement-based materials.
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[0022] 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.
[0023] The uniaxial compression fatigue tests of 4 kinds of loading frequencies were carried out on the samples of ultra-high toughness cement-based materials, and the average value of the compressive strength of the materials under quasi-static loading was 30.2 MPa. Fatigue test The stress level is 0.85, the stress ratio R is 0.1, and the loading frequency is 8Hz, 2Hz, 0.5Hz, 0.125Hz. The fatigue life of the sample under each loading frequency is obtained, as shown in the table below. The quasi-static uniaxial compression test was carried out on the cement-based material, and the quasi-static loading strengths obtained were 28.21MPa, 28.91MPa, 29.86MPa, 30.45MPa, 30.45MPa, 30.60MPa, 30.66M...
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Abstract
The invention discloses a building method for a cement-based-material fatigue-failure-probability and fatigue-service-life-probability model considering the loading frequency. Based on the quasi-static loading strength and the fatigue service life in different kinds of loading frequency of a cement-based material, a fatigue-service-life-probability model of the cement-based material can be simply, conveniently and rapidly obtained. By means of the model, on one hand, the fatigue failure probability of the cement-based material and the fatigue failure probability of the structure of the cement-based material can be forecasted through the fatigue loading cycle index; on the other hand, the service life of the cement-based material and the service life of the structure can be calculated by setting the fatigue failure probability; the novel path and the novel method are provided for the fatigue performance designing of the corresponding structure and detection and assessment of the service conditions of the structure under fatigue loading.
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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IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0005G01N2203/0073G01N2203/0252
Inventor 黄博滔徐世烺李庆华
Owner ZHEJIANG UNIV