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Method for calculating shear capacity of reinforced concrete flexural beam

A technology of shear bearing capacity and calculation method, which is applied in the field of reinforced concrete beams, can solve the problems that the calculation model is not representative, the parameters of the bearing capacity of the oblique section of RC beams cannot be fully considered, and the number of test pieces is limited, etc., so as to achieve practicability strong, accurate prediction results, and reasonable calculation models

Active Publication Date: 2019-06-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

Scholars mostly use regression to obtain the calculation formula for the bearing capacity of corroded RC beams based on their own test results. However, the number of test pieces is limited after all, so the parameters affecting the bearing capacity of the oblique section of RC beams have not been fully considered, and the calculation model obtained does not have representative

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] (1) Selection of test materials

[0068] 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.

[0069] Table 1 Basic properties of cement

[0070]

[0071] 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.

[0072] Table 2 Screening results of sand

[0073]

[0074] The fineness modulus of sand (M x ) is calculated according to the following formula:

[0075]

[0076] Table 3 Basic properties of sand

[0077]

[0078] Continuously graded gravel with a nominal particle size of 5-25mm was used in the test, and the screening test conditions and related performances are shown in Table 4 and Table 5, respectively.

[0079] Table 4 Screening results of stones

[0080]

[0081] Table 5 Basic properties of stones

[0082]

[0083] The long...

Embodiment 2

[0164] (1) Test piece design

[0165] 14 beams were designed for the test, and the parameters are shown in Table 10.

[0166] Table 10 Test beam design parameters

[0167]

[0168]

[0169] 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.

[0170] 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 the shear capacity of a reinforced concrete flexural beam. The method comprises the following steps: step 1, measuring basic parameters of a reinforcedconcrete beam before corrosion; 2, measuring basic parameters of stirrups in the reinforced concrete beam before rusting; 3, determining the weight loss rate of the stirrups of the reinforced concretebeam before and after corrosion by measuring the weight of the stirrups of the reinforced concrete beam before and after corrosion; and step 4, establishing a calculation model of the shear capacityof the stirrup rusted reinforced concrete beam, and predicting the shear capacity of the stirrup rusted reinforced concrete beam.

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 beams subjected to bending. Background technique [0002] The reinforced concrete structure has the advantages of concrete and steel bars, and is convenient for construction and easy to obtain materials. Reinforced concrete is the most common and widely used building material. However, due to poor conditions of use in the marine environment and industrial environment, environmental pollution caused by increased CO2 concentration and acid rain, improper use methods such as sprinkling ice salt on roads and bridges, corrosion of steel bars in concrete structures has become a common phenomenon. safety and durability are seriously affected. Professor P.K.Mehta of the University of California in the United States once pointed out: "In today's world, the causes of concrete failure are ranked i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY02T90/00
Inventor 吴瑾王蒙涛李洪明
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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