Nondestructive testing method for bearing capacity of concrete bridge based on elastic modulus

An elastic modulus, non-destructive testing technology, applied in the direction of measuring devices, strength characteristics, instruments, etc., can solve the problems of lack, missed detection, lack of compromise means, etc., to achieve the effect of improving test accuracy

Active Publication Date: 2013-07-10
四川升拓检测技术股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method generally lacks quantitative methods, and bridge cracks are often very small and cannot be identified at a distance, so missed detection is very common
[0015] Therefore, there is a la

Method used

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  • Nondestructive testing method for bearing capacity of concrete bridge based on elastic modulus
  • Nondestructive testing method for bearing capacity of concrete bridge based on elastic modulus
  • Nondestructive testing method for bearing capacity of concrete bridge based on elastic modulus

Examples

Experimental program
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Embodiment

[0152] A prefabricated box girder for high-speed rail was tested in different ages and locations.

[0153] 1) Test object: prestressed box girder for high-speed rail, with a length of 32m. The design strength of concrete is C50, and the design modulus of elasticity is E c It is 34.5GPa.

[0154] 2) Test position: for the top plate and web plate respectively image 3 Excite and test the P-wave velocity in the same way, with a total of 6 measuring lines;

[0155] 3) Test age: 3.5d, 7d, 9d, 10d, 14d, 15d

[0156] 4) Test typical waveforms such as Figure 5 shown.

[0157] 5) According to the reinforcement condition, test the elastic modulus E of the concrete everywhere c , the results are as follows:

[0158]

[0159]

[0160] 6) According to the age relationship, the estimated 28-day-old concrete elastic modulus exceeds the design value by 34.5GPa;

[0161] 7) According to the test results, the beam is considered qualified.

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Abstract

The invention relates to a nondestructive testing method for the bearing capacity of a concrete bridge based on elastic modulus, and belongs to the technical field of engineering testing. The nondestructive testing method comprises the steps of: dividing a stress area into a compression area, a tensioning area, a shearing area and a neutral area without stress according to the type of the concrete bridge; carrying out impact elastic wave velocity testing on all the areas, knocking an excitation block and changing an excitation direction, so as to obtain first waves of an excitation elastic wave, namely a compression wave and a tensile wave, and deducing whether cracks exist in a testing area or not according to the velocity difference of the two waves; calculating the concrete tangent elastic modulus Ed; measuring the concrete elastic modulus Ec, and deducing the compressive strength of concrete; deducing the stress level and the stress state of the corresponding area according to the concrete tangent elastic modulus and the compressive strength of the concrete in all the areas; and deducing the bearing capacity of the bridge according to the stress level and the stress state of all the areas. By implementing the nondestructive testing method, safety guarantee data can be provided for the health evaluation of the bridge.

Description

technical field [0001] The invention belongs to the technical field of engineering detection, in particular to a non-destructive testing method for the bearing capacity of concrete bridges based on elastic modulus. Background technique [0002] Whether the bridge is safe or not is a big issue related to the national economy and the people's livelihood. The damage or even collapse of bridges will not only bring great losses to transportation, but also cause huge disasters to people's lives and properties. The above invention is not only applicable to the detection of ordinary reinforced concrete bridges, but also applicable to the detection of prestressed concrete bridges. Not only existing bridges can be tested, but also concrete bridges under construction. [0003] So far, bridges have been damaged or even collapsed for the following reasons: [0004] a) Poor construction quality is one of the main reasons for bridge span collapse during construction or serious safety ha...

Claims

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Application Information

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IPC IPC(8): G01N3/00
Inventor 吴佳晔吴曾炜
Owner 四川升拓检测技术股份有限公司
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