Test and numerical study on the near-field explosion response of reinforced concrete box girder

ZHOU Guangpan; LIN Zhicheng; WANG Mingyang; FAN Jin; ZHANG Yuye

doi:10.11883/bzycj-2022-0468

Volume 43 Issue 7

Jul. 2023

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ZHOU Guangpan, LIN Zhicheng, WANG Mingyang, FAN Jin, ZHANG Yuye. Test and numerical study on the near-field explosion response of reinforced concrete box girder[J]. Explosion And Shock Waves, 2023, 43(7): 072201. doi: 10.11883/bzycj-2022-0468

Citation:

ZHOU Guangpan, LIN Zhicheng, WANG Mingyang, FAN Jin, ZHANG Yuye. Test and numerical study on the near-field explosion response of reinforced concrete box girder[J]. Explosion And Shock Waves, 2023, 43(7): 072201. doi: 10.11883/bzycj-2022-0468

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Test and numerical study on the near-field explosion response of reinforced concrete box girder

doi: 10.11883/bzycj-2022-0468

1.
School of Science, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
3.
State Key Laboratory of Explosion and Impact and Disaster Prevention and Mitigation, Army Engineering University of PLA, Nanjing 210007, Jiangsu, China

Received Date: 2022-10-16
Rev Recd Date: 2023-04-28

Available Online: 2023-05-12

Publish Date: 2023-07-05

Abstract

Abstract

In order to study the dynamic response and failure characteristics of the concrete girder with single box and three chambers under near-field explosion, the explosion test and numerical simulation of a scaled specimen were carried out. The girder specimen was designed and manufactured by the scale of 1∶3 according to the prototype bridge girder. The bottom of the specimen was supported by six brick supports. The TNT grain was located at 0.4 m above the top plate center of the middle chamber with an equivalent of 3 kg and a proportional distance of 0.77 m/kg^1/3. The reflected overpressure, reinforcement strain, vertical displacement and acceleration of bottom plate and the shape of breach were measured and analyzed. The effectiveness of the explosion load in the test was verified by comparing the measured reflection overpressure with the calculated value by the CONWEP empirical formula. The LS-DYNA software was used to simulate the explosion response of the box girder. The SOLIDWORKS software and HYPERMESH software were used to establish the finite element model of the specimen. The Solid 164 element was used to simulate the concrete, and Beam 188 element was used to simulate the steel rebar. The LOAD BLAST ENHANCED (LBE) method was used to apply explosive loads. The *MAT_CONCRETE_DAMAGE_REL3 material model and *MAT_PLASTIC_KINEMATIC model were used to simulate the concrete and rebar, respectively, to consider the effects caused by high strain and large deformation. The keyword *MAT_ADD_EROSION was used to define the failure of concrete. The reliability of numerical simulation method was verified with the test data. Finally, the effects of TNT equivalent, detonation location, concrete strength, and reinforcement ratio on the explosion resistance of the box girder were analyzed. The results show that when a TNT grain of 3 kg is detonated at 0.4 m above the center of the middle chamber of the box girder, an elliptical penetration breach is formed in the center of top plate of the middle chamber, with the length values along the transverse and longitudinal bridge directions being 41.50 and 45.50 cm, respectively. The concrete on the bottom surface of the top plate of the middle chamber peels off in a large area, presenting a trumpet-shaped punching failure feature. The extra-wide cross-section of multi-chamber box girder makes the explosive responses unevenly distributing along the transverse bridge direction. The peak values of vertical displacement and rebar strain of the bottom plate of the girder increase with the increase of the charge. Using the least square method, the corresponding fitting curve expressions are obtained. Under the working conditions of different detonation positions, the vertical displacement of the bottom plate center of the middle chamber is greater than those of the chamber centers on both sides. The results can provide a basis for the anti-explosive evaluation and protection of similar extra-wide concrete box girder.
- bridge engineering,
- reinforced concrete box girder,
- near-field explosion,
- explosion response

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References

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