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| Dynamic response analysis of GFRP-concrete compined beams under cumulative impact loading |
| YANG Lihui1,ZHOU Wenbo1,WANG Yan2,ZHANG Haotian3,GONG Xunxun1 |
| 1.School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
2.Beijing Zhongjian Land Property Co.,Ltd., Beijing 100000, China;
3.CABR Testing Center Co.,Ltd., Beijing 100013, China |
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Abstract To investigate the dynamic response of glass fiber composite (GFRP)-concrete combination beams under multiple rockfall impact loads, one pure GFRP beam and four GFRP-concrete combination beams were subjected to cumulative impact tests using a rocking arm drop hammer testing machine, and the displacement, impact force, strain time course curves and crack development states of the test beams under different working conditions were obtained, and the damage evolution process of the beams was discussed in stages. The test results show that the pure GFRP beams have excellent impact resistance, but the deformation under the impact load is too large; the damage of the combined beams are all characterized by the concrete main crack penetration and the peeling of the GFRP-concrete interface, and good interfacial adhesion performance is the key to ensure the improvement of the impact resistance of the combined GFRP-concrete beams; under the vertical impact load, the increase of the concrete thickness can obviously reduce the damage of the same Under the vertical impact load, the increase of concrete thickness can significantly reduce the deformation response in the span of the beam at the same impact height; the ability of the test beam to resist the lateral impact is better than its ability to resist the vertical impact. The cumulative impact model of GFRP-concrete composite beam was established by using the display dynamic analysis software LS-DYNA, and the influence law of parameters such as impact hammer mass, impact velocity and section height ratio on the dynamic response of GFRP-concrete composite beam was analyzed based on this model.
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Received: 11 May 2023
Published: 28 March 2024
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