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Method for calculating crack width of reinforcing steel bar-steel fiber concrete shield duct piece

A technology of steel fiber reinforced concrete and crack width, applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve problems such as not satisfying engineering practice, and achieve the effect of accurate calculation results

Inactive Publication Date: 2019-05-21
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

The traditional method of calculating the cracking moment of steel fiber reinforced concrete is relatively conservative, and only for members with strength grades of CF20~CF40, which is not satisfied with engineering practice.

Method used

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  • Method for calculating crack width of reinforcing steel bar-steel fiber concrete shield duct piece
  • Method for calculating crack width of reinforcing steel bar-steel fiber concrete shield duct piece
  • Method for calculating crack width of reinforcing steel bar-steel fiber concrete shield duct piece

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Embodiment Construction

[0064] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0065] Through the loading test of the steel-steel fiber reinforced concrete beam, the cracking moment, the crack width and the corresponding external load at different loading levels after cracking were tested, and the calculation method of the cracking moment was pushed to the calculation method of the cracking moment by using the method of equal conversion. And the test data were analyzed by linear regression to obtain th...

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Abstract

The invention discloses a method for calculating the crack width of a reinforcing steel bar-steel fiber concrete shield duct piece. The method comprises: S1, carrying out loading testing on a reinforcing steel bar-steel fiber concrete beam; S2, carrying out calculation based on loading test data to obtain a crack width influence coefficient; S3, determining a corresponding pre-crack width according to the crack width influence coefficient; S4, carrying out calculation based on loading test data to obtain a tensile strength influence coefficient; S5, determining a corresponding crack bending moment based on the tensile strength influence coefficient; and S6, carrying out correction based on the calculation formula of the pre-crack width and acquiring a corresponding crack width according tothe corrected calculation formula. The calculation result is more accurate and close to the actually measured result. The method is easy to apply directly in the engineering practice and the reference is provided for the tunnel duct piece design. The method has the important engineering application value. An assessment basis is provided for evaluating the durability of the high-strength reinforcing steel bar-steel fiber concrete shield duct piece.

Description

technical field [0001] The invention belongs to the technical field of calculating the crack width of concrete members, and in particular relates to a calculation method for the crack width of a steel bar-steel fiber concrete shield segment. Background technique [0002] Rebar-steel fiber concrete is prepared by mixing a certain amount of short steel fibers randomly distributed in the ordinary reinforced concrete matrix, which greatly improves the ductility and toughness of the concrete, and prevents the development of micro-cracks inside the concrete and the formation of macro-cracks. Expansion, so that the damage of concrete has certain ductility characteristics, and its durability and fatigue resistance have also been greatly improved. [0003] With the wide application of tunnel shield technology, the problem of segment cracking has gradually emerged. The shield segment needs to bear the uncertain load in the process of manufacturing, handling and installation and the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/00
Inventor 周佳媚周瑶马敏王英学邹仕伟程毅黄柯赵大权李朗朱宇刘同财
Owner SOUTHWEST JIAOTONG UNIV
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