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Method for calculating shear capacity of reinforced concrete camber beam

A technology for shear bearing capacity and reinforcing steel bars, which is applied in the field of reinforced concrete beams, can solve the problems of rare, corroded RC beam oblique section reinforcement research, etc., and achieve the effects of strong practicability, accurate prediction results, and comprehensive considerations

Active Publication Date: 2019-05-21
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Application Information

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Problems solved by technology

However, no consistent conclusions have been reached on the damage mechanism of corroded RC beams and the calculation model of the shear bearing capacity of oblique sections; a lot of research has been done on carbon fiber reinforced RC beams, and some satisfactory conclusions have been obtained, but for the oblique section of corroded RC beams Relatively little research has been done on reinforcement

Method used

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  • Method for calculating shear capacity of reinforced concrete camber beam
  • Method for calculating shear capacity of reinforced concrete camber beam
  • Method for calculating shear capacity of reinforced concrete camber beam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) Selection of test materials

[0070] The cement used in the test is P.Ⅱ42.5R Portland cement, and the water is tap water. Table 1 shows the basic properties of the cement part provided by the manufacturer.

[0071] Table 1 Basic properties of cement

[0072]

[0073] The river sand used in the test is medium sand, and its sieving test conditions and related properties are shown in Table 2 and Table 3, respectively.

[0074] Table 2 Screening results of sand

[0075]

[0076] The fineness modulus of sand (M x ) is calculated according to the following formula:

[0077]

[0078] Table 3 Basic properties of sand

[0079]

[0080] Continuously graded crushed stone with a nominal particle size of 5-25mm was used in the test. See Table 4 and Table 5 for the sieving test conditions and related properties, respectively.

[0081] Table 4 Screening results of stones

[0082]

[0083]

[0084] Table 5 Basic properties of stones

[0085]

[0086] Th...

Embodiment 2

[0171] (1) Test piece design

[0172] 14 beams were designed for the test, and the parameters are shown in Table 10.

[0173] Table 10 Test beam design parameters

[0174]

[0175]

[0176] In general, concrete plays a large role in the shear capacity of reinforced concrete beams. Therefore, in order to clearly reflect the influence of the corrosion of stirrups and longitudinal bars on the shear capacity of reinforced concrete beams, the strength grade of concrete was reduced as much as possible in this test, and the strength grade of concrete was designed according to the requirements of C20. The concrete mix ratio is cement: sand: stone: water = l: 2.5: 3.36: 0.55.

[0177] A total of 14 reinforced concrete simply supported beams were produced, which were divided into three types: 6 beams with corroded stirrups (numbered L1~L6), 6 beams with corroded longitudinal bars and stirrups (numbered LT~L12) and 2 beams with corroded stirrups For non-corroded (numbered L13, L...

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Abstract

The invention provides a method for calculating shear capacity of a reinforced concrete camber beam. The method comprises the following steps: 1, measuring basic parameters of the reinforced concretecamber beam before corrosion; 2, measuring basic parameters of stirrups in the reinforced concrete camber beam before corrosion; 3, determining the weight loss rate of the stirrups before and after corrosion of the reinforced concrete camber beam by measuring the weight of the stirrups before and after corrosion of the reinforced concrete camber beam; 4, performing carbon fiber reinforcement on the rusted reinforced concrete camber beam; 5, determining basic parameters of the carbon fiber cloth; and 6, establishing a calculation model of the shear capacity of the reinforced concrete camber beam reinforced by the stirrup rusted carbon fiber cloth, and predicting the shear capacity of the stirrup rusted reinforced concrete camber beam. According to the method, factors are comprehensively considered; a calculation model is more reasonable; a prediction result is accurate; and the practicability is high.

Description

technical field [0001] The invention relates to the technical field of reinforced concrete beams, in particular to a method for calculating the shear bearing capacity of reinforced concrete bending beams. Background technique [0002] If the corroded reinforced concrete structure is not repaired and strengthened in time, it will bring safety hazards to use and cause huge loss of life and property. However, there are relatively few studies on the reinforcement of corroded reinforced concrete structures, and even fewer studies on the reinforcement of oblique sections of concrete beams after corrosion of steel bars. [0003] Both Hu Ruolin et al. and Shao Yunda et al.'s studies showed the feasibility of strengthening the flexural capacity of corroded RC beams with CFRP. Ray et al. [93] After energizing the longitudinal reinforcement of reinforced concrete beams to accelerate corrosion, paste carbon fiber cloth on the bottom of the beam for bending reinforcement, and load it t...

Claims

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Application Information

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IPC IPC(8): E04G23/02G06F17/50
Inventor 吴瑾王蒙涛李洪明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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