Experimental study on blast resistance performance and damage repair of precast concrete column under close-in explosion

LYU Chenxu; YAN Qiushi; LI Liang

doi:10.11883/bzycj-2022-0225

Volume 43 Issue 6

Jun. 2023

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LYU Chenxu, YAN Qiushi, LI Liang. Experimental study on blast resistance performance and damage repair of precast concrete column under close-in explosion[J]. Explosion And Shock Waves, 2023, 43(6): 063301. doi: 10.11883/bzycj-2022-0225

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LYU Chenxu, YAN Qiushi, LI Liang. Experimental study on blast resistance performance and damage repair of precast concrete column under close-in explosion[J]. Explosion And Shock Waves, 2023, 43(6): 063301. doi: 10.11883/bzycj-2022-0225

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Experimental study on blast resistance performance and damage repair of precast concrete column under close-in explosion

doi: 10.11883/bzycj-2022-0225

Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, Beijing 100124, China

Received Date: 2022-05-25
Rev Recd Date: 2023-01-18

Available Online: 2023-02-21

Publish Date: 2023-06-05

Abstract

Abstract

In order to investigate the anti-explosion performance and post-blast performance after reinforcement/repair of precast concrete (PC) columns under close-in explosion, the explosion test of full-scale PC column and axial compression test of repaired blast-induced damage PC column were conducted. The PC columns with the two widely used assembly connections, i.e., half grout sleeve connection and slurry anchor lap connection, were selected to investigate the effect of connection type on blast resistance and to compare the damage and dynamic response with the reinforced concrete (RC) column of the same specification. The explosion test results show that PC columns had a local damage failure mode. The concrete spalling and oblique cracks occurred near the explosion center and penetrating cracks appeared on the interface of the assembly position. The damage of the anchor slurry lapped PC column was more severe than the grouting sleeve PC column. The PC columns of the two assembly forms had comparable dynamic response and damage characteristics as the RC column in general, but the assembly interface weakened the integrity and shear resistance of the PC column because of its discontinuity. It is the typical weak position of the PC column and should be noticed in design and protection. The axial compression test results show that the axial bearing capacity of the PC column repaired by concrete replacement exceeds 20.8% and 30.6% compared to the undamaged column test value and the calculated value of the same specification respectively. The exceeding proportion of the PC column repaired by concrete replacement and wrapping carbon fiber reinforcement polymer (CFRP) sheet is 38.3% and 49.6% respectively. The results show that it is feasible to reinforce and repair the damaged PC column using the concrete replacement or combining concrete replacement with the wrapping CFRP sheet method, which can meet the requirements of axial bearing capacity.
- close-in blast load,
- PC column,
- dynamic response,
- damage failure,
- reinforcement and repair

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References(27)

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