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A calculation method of ultimate bending capacity of reinforced severe damage beam with fiber reinforced polymer

A calculation method and bearing capacity technology, applied in calculation, special data processing applications, instruments, etc., can solve problems such as less research

Inactive Publication Date: 2017-01-25
SHIHEZI UNIVERSITY
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  • Application Information

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Problems solved by technology

[0003] However, the current strengthening research is limited to ordinary reinforced concrete beams or slightly damaged or corroded reinforced concrete beams, and there are few studies on the use of FRP sheets to strengthen severely damaged reinforced concrete beams.

Method used

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  • A calculation method of ultimate bending capacity of reinforced severe damage beam with fiber reinforced polymer
  • A calculation method of ultimate bending capacity of reinforced severe damage beam with fiber reinforced polymer
  • A calculation method of ultimate bending capacity of reinforced severe damage beam with fiber reinforced polymer

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specific Embodiment

[0118] Now take the B0-yl-1 beam as an example to apply the calculation formula. The concrete strength grade of heavily damaged reinforced concrete beams is C40, and the average cubic compressive strength is 42.8MPa. According to the code, take f ck =26.8MPa, b=200mm, h=300mm, h 0 =269mm,E B =105GPa,A B =1×190mm×0.115mm=21.85mm 2 , f y =426.7MPa,A s =340mm 2 , a s = 31mm, l 0 = 2.1 m. The specific calculation process is as follows:

[0119] (1) Bring the above parameters into formula (9) to calculate the values ​​of a, b and c, and get a=309508258.1N·mm, b=-36639892.2N·mm, c=-2271307.5N·mm.

[0120] Putting the values ​​of a, b and c into formula (8), we can get ξ n =0.1633, then the compression zone height x n = ξ n h 0 = 43.93mm.

[0121] (2) According to Figure 4 It can be seen that the cracks have extended to the height of the compression zone before reinforcement, and the compressive strength of concrete needs to be reduced according to formula (12). but...

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Abstract

The invention relates to a calculation method of ultimate bending capacity of reinforced severe damage beam with fiber reinforced polymer, comprising the steps of the geometrical relationship that S1, going through the cross section of beam strain, the material stress- strain relationship, the establishment of mechanical model, calculating the relative compression zone height; S2, reducing the compressive strength of the concrete in the compression zone; S3, adopting the axial compressive strength of the concrete after the reduction, according to the above steps to recalculate the height of the compression zone; S4, calculating the ultimate bending moment; and S5, calculating the ultimate bending load capacity. The invention provides a prediction for the design and research of the ultimate flexural capacity of the RC beam with a single section of the reinforced concrete with a single rib, and saves the measured cost and a lot of test timeso as to make the ultimate bearing capacity of the reinforcement structure design more accurate;accurately calculating the ultimate bending capacity of the reinforced beam, which makes the engineering and technical personnel more accurate and convenient to control the loading process of the fiber reinforced concrete beam; The method has great economic benefit.

Description

technical field [0001] The invention relates to the field of structural reinforcement, in particular to a method for calculating the ultimate bending bearing capacity of a severely damaged beam reinforced with fiber cloth. Background technique [0002] In recent years, the research and application of Fiber Reinforced Polymer (FRP) in the reinforcement of reinforced concrete beams has developed rapidly. When the reinforced concrete structure has design errors, fire, earthquake, corrosion or fatigue damage, etc., the bearing capacity is insufficient, and many cracks will appear. In fact, it is precisely because of these cracks that people will reinforce it. reason. Therefore, it is of great practical significance to study the reinforcement of reinforced concrete beam members after damage. [0003] However, the current reinforcement research is limited to ordinary reinforced concrete beams or slightly damaged or corroded reinforced concrete beams, and there are few studies on...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13
Inventor 秦子鹏田艳李刚许政吕廷波马玉薇蓝明菊杨骏李玉芳
Owner SHIHEZI UNIVERSITY
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