Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (2): 496-504.doi: 10.13229/j.cnki.jdxbgxb20210687

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Experimental on crushing of concrete beams by high⁃voltage pulse discharge

Xiao-dong WANG(),Ning-jing LI,Qiang LI   

  1. School of Architectural and Civil Engineering，Harbin University of Science and Technology，Harbin 150080，China
  • Received:2021-07-18 Online:2023-02-01 Published:2023-02-28

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Abstract:

The crushing tests of 15 reinforced concrete beams were carried out by high-voltage pulse discharge（HVPD） in liquid. Based on the comparative analysis of the electrohydraulic effect and the copper wire explosion in liquid on the crushing test of concrete beams， the latter is determined as the optimal scheme. The parameters in the test include strength of concrete， borehole aperture， hole spacing， HVPD voltage and number of copper wires. The results show that the breaking effect of concrete beam increases obviously with the increase of discharge voltage and the number of copper wires， and slightly with the decrease of concrete strength. In the case of all the other parameters being equal， the concrete beam with a hole diameter of 40 mm is better than the concrete beam with a hole diameter of 50 mm. And the concrete beam with drilling spacing of 300 mm has a better crushing effect than the concrete beam with drilling spacing of 400 mm. According to the test results， a mathematical expression was established between the failure degree of concrete beam （i.e.， the crack width of concrete at beam side） and the output voltage， the number of copper wires discharged， the strength of concrete and other key parameters.

Key words: structural engineering, high-voltage pulse, copper wire explosion, concrete beam, crush, crack

CLC Number: 

  • TU375

Table 1

Physical and mechanical properties of concrete"

混凝土

强度等级

μfcu/

（N·mm-2）

μfc/

（N·mm-2）

μft/

（N·mm-2）

μEc/ （104N·mm-2）
C2025.619.51.92.83
C3034.626.12.53.14
C4044.330.92.73.20

Table 2

Physical and mechanical properties of reinforcement"

钢筋种类μfy/ （N·mm-2）μfu/ （N·mm-2）μEs/ （105N·mm-2）
?6336.7523.32.18
?8331.9510.62.23
?12376.4563.12.12
?14412.1564.32.22

Fig.1

Drilling arrangement and numbering of concrete beams"

Fig.2

Diagram of electrode in beam"

Fig.3

Hydroelectric effect crushing effect"

Fig.4

Broken effect of copper wire explosion"

Fig.5

Variation of concrete crack width with discharge times"

Table 3

Concrete beam copper wire explosion test parameters"

孔编号L1L2L3L4L5L6L7
峰值电压V/kV铜丝根数n峰值电压V/kV铜丝根数n峰值电压V/kV铜丝根数n峰值电压V/kV铜丝根数n峰值电压V/kV铜丝根数n峰值电压V/kV铜丝根数n峰值电压V/kV铜丝根数n
110060100501005010060100601005010060
28050806080509060804080607040
34060606050408060805060604040
46050506060406050605050608050
55050706050304040505070605030
64050906040309050405090504030
77040705070506040
89040706090609060

Fig.6

High-voltage pulse crushing effect of concrete beam"

Fig.7

Relationship between crack width and discharge voltage under aperture 40 mm"

Fig.8

Relationship between crack width and number of copper wire roots under aperture 40 mm"

Fig.9

Relationship between crack width and borehole aperture"

Fig.10

Crushing effect of concrete beam after preliminary treatment"

Fig.11

Fitting surface of concrete crack width with copper wire number and discharge voltage （Single hole，the diameter is 40 mm， the spacing is 300~400 mm， and the end distance is 150 mm）"

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